Coalbed methane reservoir enrichment and recovery evaluation method and device

Abstract

The present application provides a coalbed methane reservoir enrichment and recoverability evaluation method and device, belonging to the coalbed methane development technical field. The method comprises: obtaining coalbed methane evaluation parameters, and based on the coalbed methane evaluation parameters, using a preset evaluation factor model to calculate the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverability evaluation coefficient, wherein the preset evaluation factor model is used to quantitatively characterize the coalbed methane status from the three stages of hydrocarbon generation, enrichment and recoverability, and based on the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverability evaluation coefficient, a comprehensive evaluation result is obtained, and based on the comprehensive evaluation result, a coalbed methane reservoir enrichment and recoverability evaluation result is obtained. Establishing a refined area selection evaluation method can evaluate coalbed methane more comprehensively and improve the accuracy of coalbed methane reservoir enrichment and recoverability evaluation.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane development, and in particular to a coalbed methane reservoir enrichment and recoverability evaluation method, a coalbed methane reservoir enrichment and recoverability evaluation method device, a machine-readable storage medium and an electronic device. Background Art

[0002] my country's coalbed methane development started late. The foreign technology introduced in the early stage was only commercially developed in low-rank coalbed methane blocks with a burial depth of less than 800 meters, but failed to achieve effective development in deep-layer, high-rank coalbed methane with larger resources. The main reason is that the permeability of high-rank coal reservoirs is extremely low, less than 1mD, the pore connectivity is poor, and the reservoir pressure coefficient is low.

[0003] The indicators of traditional reservoir evaluation methods are imperfect. They only use one or more parameters such as gas content, permeability, coal seam thickness, gas saturation, roof and floor sealing, and ground stress for evaluation, which fails to reflect the difficulty of coalbed methane reservoir transformation and the coalbed methane storage and flow mechanism.

[0004] Therefore, the existing coalbed methane reservoir enrichment and recoverability evaluation methods have the problem of difficulty in achieving accurate evaluation. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a coalbed methane reservoir enrichment and recoverability evaluation method, a coalbed methane reservoir enrichment and recoverability evaluation method device, a machine-readable storage medium and an electronic device. The coalbed methane reservoir enrichment and recoverability evaluation method evaluates the total scale of gas generation, gas distribution status and gas recoverability of coalbed methane reservoirs through the three stages of hydrocarbon generation, enrichment and recoverability from coalbed methane accumulation to development, so as to evaluate coalbed methane more comprehensively and improve the accuracy of coalbed methane reservoir enrichment and recoverability evaluation.

[0006] In order to achieve the above-mentioned object, the first aspect of the present application provides a coalbed methane reservoir enrichment and recoverability evaluation method, comprising: obtaining evaluation parameters of coalbed methane;

[0007] Based on the evaluation parameters of the coalbed methane, a preset evaluation factor model is used to calculate a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient;

[0008] Based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, a comprehensive evaluation result is obtained, and based on the comprehensive evaluation result, a coalbed methane reservoir enrichment and recoverability evaluation result is obtained;

[0009] The preset evaluation factor model is used to quantitatively characterize the status of coalbed methane from three stages: hydrocarbon generation, enrichment and recoverability.

[0010] In the embodiment of the present application, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model;

[0011] The evaluation parameters based on the coalbed methane are calculated using a preset evaluation factor model to obtain a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient, including:

[0012] Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient;

[0013] Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the second evaluation coefficient model to obtain an enrichment evaluation coefficient;

[0014] Based on the evaluation parameters of the coalbed methane, the third evaluation coefficient model is used to calculate the evaluation coefficient of the coalbed methane enrichment stage to obtain the recoverable evaluation coefficient.

[0015] In the embodiment of the present application, the evaluation parameters of the coalbed methane include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model;

[0016] The evaluation parameters of the coalbed methane are based on the first evaluation coefficient model, and the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated to obtain the hydrocarbon generation evaluation coefficient, including:

[0017] Based on the coal rock vitrinite reflectance and the maximum Langmuir volume, the gas growth coefficient is calculated using the first evaluation coefficient model;

[0018] Based on the gas growth coefficient, a hydrocarbon generation evaluation coefficient is obtained.

[0019] In the embodiment of the present application, the gas growth coefficient model is expressed as:

[0020] Among them, G r is the gas growth coefficient, R o is the reflectance of coal vitrinite, v maxL is the maximum Langmuir volume.

[0021] In the embodiment of the present application, the evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model;

[0022] The method of calculating the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameter of the coalbed methane and using the second evaluation coefficient model to obtain the enrichment evaluation coefficient includes:

[0023] Based on the Langmuir volume and the measured gas content, the gas escape coefficient is calculated using the gas escape coefficient model;

[0024] Based on the fault parameters, the fracture development coefficient is calculated using the fracture development coefficient model;

[0025] Based on the water production, drainage days and liquid level drop depth, the water distribution coefficient is calculated using the water distribution coefficient model;

[0026] Based on the gas escape coefficient, fracture development coefficient and water body distribution coefficient, an enrichment evaluation coefficient is obtained.

[0027] In the embodiment of the present application, the gas escape coefficient model is expressed as:

[0028] Among them, G e is the gas escape coefficient, V L is the Langmuir volume, and V is the measured gas content.

[0029] In the embodiment of the present application, the fracture development coefficient model is expressed as:

[0030] Among them, F ai is the fracture growth coefficient, S fm is the fault damage area, S m is the unit area, and n is the number of cells.

[0031] In the embodiment of the present application, the water body distribution coefficient model is expressed as:

[0032] Among them, W i is the water distribution coefficient, Q W is the water production, t is the number of drainage days, and D is the depth of liquid level drop.

[0033] In the embodiment of the present application, the evaluation parameters of the coalbed methane also include the number of anticlines, the number of synclines, the area, the primary-fragmentation volume, the total volume of the coal seam, the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model;

[0034] The evaluation parameters based on the coalbed methane are used to calculate the evaluation coefficient of the coalbed methane enrichment stage using the third evaluation coefficient model to obtain the recoverable evaluation coefficient, including:

[0035] Based on the number of anticlines, the number of synclines and the area, the structural control coefficient is calculated using the structural control coefficient model;

[0036] Based on the fracture development coefficient, primary-fragmentation volume and total volume of the coal seam, the coal body development coefficient is calculated using the coal body development coefficient model;

[0037] Based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, the stress concentration coefficient is calculated using the stress concentration coefficient model;

[0038] Based on the structural control coefficient, coal body development coefficient and stress concentration coefficient, a mining evaluation coefficient is obtained.

[0039] In the embodiment of the present application, the structural control coefficient model is expressed as:

[0040] Among them, ε is the structural control coefficient, A i is the anticline number, X i -syncline number, S is the area.

[0041] In the embodiment of the present application, the coal body development coefficient model is expressed as:

[0042] Among them, H ci is the coal body development coefficient, E ai is the fracture growth coefficient, V i is the primary-fragmentation volume, and V is the total volume of the coal seam.

[0043] In the embodiment of the present application, the stress concentration coefficient model is expressed as:

[0044] Among them, σ ci is the stress concentration coefficient, σ max is the maximum horizontal principal stress, σ min is the minimum principal stress, σ H is the vertical principal stress.

[0045] In the embodiment of the present application, the comprehensive evaluation result obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient includes:

[0046] Normalizing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient to obtain a normalized hydrocarbon generation evaluation coefficient, a normalized enrichment evaluation coefficient and a normalized recoverable evaluation coefficient;

[0047] The average values ​​of the normalized hydrocarbon generation evaluation coefficient, the normalized enrichment evaluation coefficient and the normalized recoverable evaluation coefficient are calculated to obtain a comprehensive evaluation result.

[0048] In the embodiment of the present application, the comprehensive evaluation result is expressed as:

[0049] Among them, Gr is the gas growth coefficient, G e is the gas escape coefficient, F ai is the fracture growth coefficient, W i is the water distribution coefficient, W max is the regional maximum water distribution coefficient, ε is the structural control coefficient, and ε max is the regional maximum structural control coefficient, H ci is the coal body development coefficient, σ ci is the stress concentration coefficient, and Y is the comprehensive evaluation result.

[0050] In the embodiment of the present application, the comprehensive evaluation result obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient includes:

[0051] Obtaining standard values ​​corresponding to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient respectively;

[0052] Respectively comparing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient with their corresponding standard values ​​to obtain a plurality of ratios;

[0053] Based on the preset weights and the multiple ratios, a comprehensive evaluation result is obtained by using a logarithmic function calculation.

[0054] In the embodiment of the present application, the comprehensive evaluation result is expressed as:

[0055] Among them, G r is the gas growth coefficient, G rstd is the standard value of the gas growth coefficient, G e is the gas escape coefficient, G estd is the standard value of gas escape coefficient, F ai is the fracture growth coefficient, F aists is the standard value of fracture growth coefficient, W i is the water distribution coefficient, W istd is the standard value of water distribution coefficient, ε is the structural control coefficient, and ε std is the standard value of the construction control coefficient; H ci is the coal body development coefficient, H cistd is the standard value of coal body development coefficient, σ ci is the stress concentration coefficient, σ cistd is the standard value of stress concentration coefficient, and Y is the comprehensive evaluation result.

[0056] In the embodiment of the present application, at least one of the following steps is also included:

[0057] Based on the hydrocarbon generation evaluation coefficient, obtaining a hydrocarbon generation evaluation result;

[0058] Based on the enrichment evaluation coefficient, obtaining an enrichment evaluation result;

[0059] Based on the recoverable evaluation coefficient, a recoverable evaluation result is obtained.

[0060] The second aspect of the present application provides a coalbed methane reservoir enrichment and recoverability evaluation device, comprising:

[0061] An acquisition module is used to obtain evaluation parameters of coalbed methane;

[0062] The first calculation module is used to calculate the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient based on the evaluation parameters of the coalbed methane using a preset evaluation factor model; the preset evaluation factor model is used to quantitatively characterize the status of the coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverability;

[0063] The second calculation module is used to obtain a comprehensive evaluation result based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, and to obtain a coalbed methane reservoir enrichment recoverable evaluation result based on the comprehensive evaluation result.

[0064] In the embodiment of the present application, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model;

[0065] The first calculation module includes:

[0066] A first coefficient calculation submodule is used to calculate the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane based on the evaluation parameters of the coalbed methane using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient;

[0067] A second coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane using the second evaluation coefficient model to obtain the enrichment evaluation coefficient;

[0068] The third coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane and adopt the third evaluation coefficient model to obtain the recoverable evaluation coefficient.

[0069] In the embodiment of the present application, the evaluation parameters of the coalbed methane include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model;

[0070] The first coefficient calculation submodule includes:

[0071] A gas growth coefficient calculation unit, used to calculate the gas growth coefficient using the first evaluation coefficient model based on the coal rock vitrinite reflectance and the maximum Langmuir volume;

[0072] The first determination unit is used to obtain a hydrocarbon generation evaluation coefficient based on the gas growth coefficient.

[0073] In the embodiment of the present application, the evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model;

[0074] The second coefficient calculation submodule includes:

[0075] A gas dissipation coefficient calculation unit, used to calculate the gas dissipation coefficient based on the Langmuir volume and the measured gas content using the gas dissipation coefficient model;

[0076] A fracture development coefficient calculation unit, used to calculate the fracture development coefficient based on the fault parameters and using the fracture development coefficient model;

[0077] A water body distribution coefficient calculation unit, used to calculate the water body distribution coefficient using the water body distribution coefficient model based on the water production, drainage days and liquid level drop depth;

[0078] The second determination unit is used to obtain an enrichment evaluation coefficient based on the gas escape coefficient, the fracture development coefficient and the water body distribution coefficient.

[0079] In the embodiment of the present application, the evaluation parameters of the coalbed methane also include the number of anticlines, the number of synclines, the area, the primary-fragmentation volume, the total volume of the coal seam, the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model;

[0080] The third coefficient calculation submodule includes:

[0081] A control coefficient calculation unit, used to calculate the structural control coefficient using the structural control coefficient model based on the number of anticlines, the number of synclines and the area;

[0082] A coal body development coefficient calculation unit, used to calculate the coal body development coefficient using the coal body development coefficient model based on the fracture development coefficient, the primary-fragmentation volume and the total volume of the coal seam;

[0083] A stress concentration coefficient calculation unit, used for calculating the stress concentration coefficient by using the stress concentration coefficient model based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress;

[0084] The third determination unit is used to obtain a mining evaluation coefficient based on the structural control coefficient, the coal body development coefficient and the stress concentration coefficient.

[0085] A third aspect of the present application provides an electronic device, the electronic device comprising:

[0086] at least one processor;

[0087] a memory connected to the at least one processor;

[0088] The memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the above-mentioned coalbed methane reservoir enrichment and recoverability evaluation method by executing the instructions stored in the memory.

[0089] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configures the processor to execute the above-mentioned coalbed methane reservoir enrichment and recoverability evaluation method.

[0090] Through the above technical scheme, by obtaining the evaluation parameters of coalbed methane, based on the evaluation parameters of the coalbed methane, the preset evaluation factor model is used to calculate the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient, wherein the preset evaluation factor model is used to quantitatively characterize the status of coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverable, and a comprehensive evaluation result is obtained based on the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient, and based on the comprehensive evaluation result, the enrichment and recoverable evaluation result of the coalbed methane reservoir is obtained. By evaluating the total gas generation scale, gas distribution status and gas recoverable status of the coalbed methane reservoir from the three stages of hydrocarbon generation, enrichment and recoverable in the process of coalbed methane accumulation to development, and establishing a refined selection evaluation method, the coalbed methane can be evaluated more comprehensively, and the accuracy of the enrichment and recoverable evaluation of the coalbed methane reservoir is improved.

[0091] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0093] Figure 1 A schematic diagram of a process flow of a coalbed methane reservoir enrichment and recoverability evaluation method according to an embodiment of the present application is shown;

[0094] Figure 2 The schematic diagram shows the seven-element reservoir enrichment recoverable classification evaluation standard according to the embodiment of the present application;

[0095] Figure 3 A schematic diagram of a coalbed methane evaluation process according to an embodiment of the present application is schematically shown;

[0096] Figure 4 A diagram schematically showing a gas growth coefficient diagram of a certain block according to an embodiment of the present application;

[0097] Figure 5 A diagram schematically showing a fracture development coefficient diagram of a certain block according to an embodiment of the present application;

[0098] Figure 6 A diagram schematically showing a gas escape coefficient diagram of a certain block according to an embodiment of the present application;

[0099] Figure 7 A diagram schematically showing a water body distribution coefficient diagram of a certain area according to an embodiment of the present application;

[0100] Figure 8 A diagram schematically showing a coal body development coefficient diagram of a certain block according to an embodiment of the present application;

[0101] Fig. 9 A schematic diagram of a stress concentration coefficient of a certain block according to an embodiment of the present application is shown;

[0102] Fig.10 A block structure control coefficient diagram according to an embodiment of the present application is schematically shown;

[0103] Fig.11 A diagram schematically shows the gas-bearing area of ​​a coal seam in a certain block according to an embodiment of the present application;

[0104] Fig.12 A schematic diagram of the structure of a coalbed methane reservoir enrichment and recoverability evaluation device according to an embodiment of the present application is shown;

[0105] Fig.13 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown.

[0106] Description of Reference Numerals

[0107] 410 - acquisition module; 420 - first computing module; 430 - second computing module; A01 - processor; A02 - network interface; A03 - internal memory; A04 - display screen; A05 - input device; A06 - non-volatile storage medium; B01 - operating system; B02 - computer program. DETAILED DESCRIPTION

[0108] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0109] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0110] Please see Figure 1 , Figure 1 The schematic diagram of the process of a coalbed methane reservoir enrichment and recoverability evaluation method according to an embodiment of the present application is schematically shown. This embodiment provides a coalbed methane reservoir enrichment and recoverability evaluation method, comprising the following steps:

[0111] Step 210: Obtaining evaluation parameters of coalbed methane;

[0112] In this embodiment, the above-mentioned coalbed methane evaluation parameters refer to parameters used for evaluating the enrichment and exploitability of coalbed methane reservoirs. When the coalbed methane is determined, the corresponding coalbed methane evaluation parameters are also determined. The above-mentioned parameters can be obtained through coalbed methane testing or exploration, including but not limited to drilling, logging, seismic interpretation results, fracturing, drainage data, etc. Specifically, in the process of obtaining the evaluation parameters of coalbed methane, a multi-attribute joint interpretation method of "guided filter coherence attribute + most negative curvature attribute + ant body tracking" can be introduced and formed to identify faults with a fault distance of more than 3 meters and collapse columns with a diameter of 6 meters; vector graphics (Encapsulated PostScript, EPS) high-definition coherence attributes + pre-stack azimuth anisotropy comprehensive research method can be introduced to detect the density and distribution direction of fractures below 3 meters; a comprehensive method of "seismic attributes + well logging + lithology" can be formed to establish a standard map of coal body structure and seismic wave group reflection characteristics, and predict the distribution law of coal body structure; the lateral pressure coefficient + innovative horizontal stress difference coefficient prediction method is introduced to form a dual characterization method of ground stress; the coalbed methane desorption and fluid testing + coal seam pressure and outcrop height difference analysis comprehensive method can be used to finely characterize the gas content of the reservoir.

[0113] Step 220: Based on the evaluation parameters of the coalbed methane, a preset evaluation factor model is used to calculate a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient; wherein the preset evaluation factor model is used to quantitatively characterize the status of the coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverability;

[0114] In this embodiment, considering that the coalbed methane reservoir enriched recoverable area is closely related to the three aspects of coalbed methane hydrocarbon generation, enrichment and recoverability, an evaluation factor model can be pre-constructed to quantitatively characterize the coalbed methane status from the three stages of hydrocarbon generation, enrichment and recoverability, and the evaluation coefficients of the coalbed methane hydrocarbon generation stage, the enrichment stage and the recoverable stage are calculated respectively, that is, the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient are obtained. Among them, the coalbed methane reservoir enriched recoverable area can be evaluated in terms of hydrocarbon generation based on the gas generation and adsorption capacity of coal rocks; the gas enrichment can be evaluated based on the preservation conditions of the coalbed methane reservoir, the influence of faults on gas enrichment, and the influence of groundwater on gas enrichment; the recoverability of coalbed methane can be evaluated based on the influence of microstructure on the recoverability of coalbed methane, the influence of coal rock damage on recoverability, and the influence of ground stress difference on recoverability.

[0115] The preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model; the evaluation parameters based on the coalbed methane are used to calculate the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, including the following steps:

[0116] Firstly, based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient;

[0117] Then, based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the second evaluation coefficient model to obtain the enrichment evaluation coefficient;

[0118] Finally, based on the evaluation parameters of the coalbed methane, the third evaluation coefficient model is used to calculate the evaluation coefficient of the coalbed methane enrichment stage to obtain the recoverable evaluation coefficient.

[0119] The first evaluation coefficient model, the second evaluation coefficient model and the third evaluation coefficient model are respectively pre-constructed to facilitate the calculation of the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient.

[0120] In some embodiments, the evaluation parameters of the coalbed methane include the coal rock vitrinite reflectance and the maximum Langmuir volume; the evaluation parameters of the coalbed methane are based on the evaluation parameters, and the first evaluation coefficient model is used to calculate the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane to obtain the hydrocarbon generation evaluation coefficient, including the following steps:

[0121] Firstly, based on the vitrinite reflectance and the maximum Langmuir volume of the coal rock, the total amount of gas is calculated using the first evaluation coefficient model to obtain the gas growth coefficient;

[0122] Then, based on the gas growth coefficient, a hydrocarbon generation evaluation coefficient is obtained.

[0123] In this embodiment, since the hydrocarbon generation in the enriched recoverable area is mainly evaluated by coal-rock gas generation and adsorption capacity, a gas growth coefficient is proposed. The gas growth coefficient can be used to characterize the total amount of gas. The larger the value, the larger the total amount of gas that can be generated. The gas growth coefficient model can be expressed as:

[0124] Among them, G r is the gas growth coefficient (dimensionless); R o is the reflectance of coal vitrinite; v maxL is the maximum Langmuir volume (m 3 ). The obtained gas growth coefficient can be used as the hydrocarbon generation evaluation coefficient.

[0125] For example: The preliminary exploration data show that the above calculation steps are used to calculate the gas growth coefficient of a certain block. The slope belt of a certain block goes from west to east, the coal seam burial depth changes from shallow to deep, the coal rock vitrinite reflectance and coal rock adsorption volume increase, and the gas growth coefficient diagram is drawn as follows: Figure 4 As shown, Figure 4 The gas growth coefficient diagram of a block according to an embodiment of the present application is schematically shown. r The area >0.4 is a coalbed methane-rich area.

[0126] Through the vitrinite reflectance and maximum Langmuir volume of coal rock, the total amount of gas, namely the gas growth coefficient, can be accurately calculated using the gas growth coefficient model, so as to accurately evaluate the gas generation and adsorption capacity of coal rock.

[0127] In some embodiments, in order to evaluate coalbed methane more finely, considering the gas enrichment, the quality of coalbed methane reservoir preservation conditions, the influence of fractures on gas enrichment, and the influence of groundwater on gas enrichment are evaluated. Therefore, a gas escape coefficient model, a fracture development coefficient model, and a water body distribution coefficient model can be constructed to form a second evaluation coefficient model. Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the second evaluation coefficient model to obtain the enrichment evaluation coefficient, including the following steps:

[0128] Firstly, based on the Langmuir volume and the measured gas content, the gas escape coefficient is calculated using the gas escape coefficient model;

[0129] In this embodiment, the gas escape coefficient can be used to characterize the amount of gas escape. The larger the value, the lower the gas content of the reservoir. The difference between the Langmuir volume and the measured gas content can be calculated first, and then the difference is compared with the Langmuir volume. The obtained ratio is used as the gas escape coefficient. The above gas escape coefficient model can be expressed as:

[0130] Among them, G e is the gas escape coefficient (dimensionless); V L is the Langmuir volume (m 3 ); V is the measured gas content (m 3 ).

[0131] For example, the above calculation steps are used to calculate the gas escape coefficient of a certain block. The western part of the slope zone of a certain block is close to the head supply area, the coalbed methane preservation conditions are poor, and the gas content is low; the faults in the northern area are more developed, the coalbed methane escape is large, and the escape coefficient G in the southeast is e <0.5, indicating that the coalbed methane preservation conditions are good and the amount of coalbed methane leakage is small, such as Figure 6 As shown, Figure 6 A diagram of the gas escape coefficient of a certain block according to an embodiment of the present application is schematically shown.

[0132] Then, based on the fault parameters, the fault development coefficient model is used to calculate the fault destruction rate to obtain the fault development coefficient;

[0133] In this embodiment, the fault parameters include the fault damage area, the number of fractures, the area of ​​the fracture, etc. The above-mentioned fracture development coefficient can be used to characterize the degree of fracture responsibility. The larger the value, the more unfavorable it is for the preservation of coalbed methane. Therefore, the fault damage rate can be calculated as the fault development coefficient. Specifically, the single fracture damage rate can be calculated first, and then the sum of all fracture damage rates can be calculated. The above-mentioned fracture development coefficient model can be expressed as:

[0134] Among them, F ai is the fracture development coefficient (dimensionless); S fm is the fault damage area (km 2 );S m is the unit area (km 2 ); n is the number of cells.

[0135] It should be noted that the above-mentioned unit cell refers to a fracture, the number of cells refers to the number of fractures, and the unit area refers to the area of ​​the fracture.

[0136] For example, based on the detailed interpretation results of 2D seismic survey lines in a certain block, the above steps are used to complete the fault development coefficient map. The results show that the fault development coefficients in the west and north-central areas are large, which is not conducive to coalbed methane enrichment; the fault coefficients in the southeast are small, which is conducive to coalbed methane enrichment. Figure 5 As shown, Figure 5 The diagram schematically shows a fracture development coefficient diagram of a certain block according to an embodiment of the present application.

[0137] Then, based on the water production, drainage days and liquid level drop depth, the water distribution coefficient is calculated using the water distribution coefficient model;

[0138] In this embodiment, the water distribution coefficient can be used to characterize the degree of influence of hydrodynamics. The larger the value, the more unfavorable it is for the preservation of coalbed methane. Specifically, the water distribution coefficient can be obtained by calculating the water production per unit depth of daily drainage and liquid level drop. The above water distribution coefficient model can be expressed as:

[0139] Among them, W i is the water distribution coefficient (m 3 / d﹒ m);Q W is the water production (m 3 );t is the drainage days;D is the depth of liquid level drop (m). The above drainage days can be set according to actual needs, for example, it can be 15 days, and accordingly, the water production is the water production for 15 days.

[0140] For example: Use the above steps to calculate the water distribution coefficient of a block, Figure 7 As shown in the figure, the water dynamics in the west are strong (W i >0.6), gradually weakening towards the east, where the hydrodynamics are weaker (W i <0.6), and the favorable area in the southeast is partially favorable for W i <0.2, which is conducive to coalbed methane enrichment, such as Figure 4 shown.

[0141] Finally, based on the gas escape coefficient, fracture development coefficient and water body distribution coefficient, an enrichment evaluation coefficient is obtained.

[0142] In this embodiment, after calculating the gas escape coefficient, the fracture development coefficient, and the water distribution coefficient, the enrichment evaluation coefficient can be obtained. The enrichment evaluation coefficient includes the above three coefficients. In this way, the enrichment stage can be evaluated in detail from three aspects: the quality of the coalbed methane reservoir preservation conditions, the influence of fractures on gas enrichment, and the influence of groundwater on gas enrichment.

[0143] Through the gas escape coefficient model, fault development coefficient model and water body distribution coefficient model, the gas escape coefficient, fault development coefficient and water body distribution coefficient are calculated respectively, which can quantitatively characterize the quality of coalbed methane reservoir preservation conditions, the influence of faults on gas enrichment, and the influence of groundwater on gas enrichment, so as to more accurately evaluate the coalbed methane enrichment stage.

[0144] In some embodiments, in order to achieve further refined evaluation of coalbed methane, considering that the recoverability of coalbed methane can be evaluated from the degree of influence of microstructure on the recoverability of coalbed methane, the influence of coal rock damage on recoverability, and the influence of ground stress difference on recoverability, therefore, a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model can be pre-established to form a third evaluation coefficient model. The evaluation parameters of the coalbed methane also include the number of anticlines, the number of synclines, the area, the primary-fragmentation volume, the total volume of the coal seam, the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress; the evaluation parameters based on the coalbed methane are used to calculate the evaluation coefficient of the coalbed methane enrichment stage using the third evaluation coefficient model to obtain the recoverable evaluation coefficient, including the following steps:

[0145] Firstly, based on the number of anticlines, the number of synclines and the area, the structural control coefficient is calculated using the structural control coefficient model;

[0146] In this embodiment, the structural control coefficient can be used to characterize the degree of micro-structure development, and the larger the value, the worse the recoverability of coalbed methane. The structural control coefficient model can be expressed as:

[0147] Where ε is the structural control coefficient (pieces / km 2 );A i is the number of anticlines; X i - number of synclines; S is the area (km 2 ).

[0148] For example, the more developed the microstructure is, the less favorable it is for coal seam fracturing; the wider the structure is, the more favorable it is for coal seam fracturing. Fig.10 It can be seen that the structural control coefficient in the southern part of a certain block is small, ε<0.2, which is conducive to coalbed methane enrichment; the coefficient in the western and northern parts is large, ε<0.3, which is not conducive to coalbed methane enrichment.

[0149] Then, based on the fracture development coefficient, primary-fragmentation volume and total volume of the coal seam, the coal body development coefficient model is used to calculate the coal body development coefficient;

[0150] In this embodiment, the coal body development coefficient can be used to characterize the integrity of the coal. The larger the value, the more complete the coal body structure and the better the recoverability of the coalbed methane. The above coal body development coefficient model can be expressed as:

[0151] Among them, H ci is the coal body development coefficient (dimensionless); F ai is the fracture development coefficient; V i is the primary-fragmentation volume (m 3 ); V is the total volume of the coal seam (m3 ).

[0152] For example, the tectonic activity in the southern part of a block is relatively weak, the structure is simple, the coal seam deposition environment is stable, and the coal body structure is mainly primary coal. The above steps are used to calculate the coal body development coefficient H. ci >0.7, which is conducive to fracturing transformation and high and stable production; the northern faults are more developed, the coal structure is more severely damaged, and the coal is mainly broken and broken. The above steps are used to calculate the coal development coefficient H ci <0.7, local H ci <0.2; The west is close to the source area, the sedimentary environment is poor, the coal seam thickness is small, the coal body structure is rich, mainly broken and broken coal, and the coal body development coefficient H ci <0.3. The overall coal development coefficient in a certain block area is large in the south and small in the west and north. Figure 8 As shown, the favorable areas in the south are expected to achieve higher production capacity.

[0153] Then, based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, the stress concentration coefficient is calculated using the stress concentration coefficient model;

[0154] In this embodiment, the stress concentration coefficient can be used to characterize the magnitude of ground stress, and the larger the value, the worse the recoverability of coalbed methane. The stress concentration coefficient model can be expressed as:

[0155] Among them, σ ci is the stress concentration coefficient (dimensionless); σ max is the maximum horizontal principal stress (MPa); σ min is the minimum principal stress (MPa); σ H is the vertical principal stress (MPa).

[0156] For example, the western and northern strata have large changes in their occurrence, with developed folds and faults, and relatively concentrated stress. The above steps are used to calculate the stress concentration coefficient. The stress concentration coefficient is large. ci >0.3; the southern part is relatively flat, and the stress concentration coefficient is smallσ ci <0.2, which is beneficial to coal seam fracturing transformation, such as Fig. 9 shown.

[0157] Finally, based on the structural control coefficient, coal body development coefficient and stress concentration coefficient, the mining evaluation coefficient is obtained.

[0158] In this embodiment, after calculating the structural control coefficient, coal body development coefficient, and stress concentration coefficient, the recoverable evaluation coefficient can be obtained. The recoverable evaluation coefficient includes the above three coefficients. In this way, a detailed evaluation can be made from the influence of microstructure on the recoverability of coalbed methane, the influence of coal rock damage on recoverability, and the influence of ground stress difference on recoverability.

[0159] Through the structural control coefficient model, coal body development coefficient model and stress concentration coefficient model, the structural control coefficient, coal body development coefficient and stress concentration coefficient are calculated respectively, which can quantitatively characterize the influence of coalbed methane recoverability, the influence of coal rock damage degree on recoverability, and the influence of ground stress difference on recoverability, so as to more accurately evaluate the recoverable stage of coalbed methane.

[0160] Please see Figure 2 , Figure 2 The schematic diagram shows the schematic diagram of the seven-component reservoir enrichment and recoverable classification evaluation standard according to the embodiment of the present application. In some embodiments, after obtaining the hydrocarbon generation evaluation coefficient, the hydrocarbon generation evaluation result can be further obtained based on the hydrocarbon generation evaluation coefficient. Specifically, the gas growth coefficient can be compared with the preset gas growth threshold to obtain the corresponding gas growth evaluation result, that is, the hydrocarbon generation evaluation result. For example, if the gas growth coefficient is greater than or equal to 1, the gas growth evaluation result is "excellent"; if the gas growth coefficient is greater than or equal to 0.7 and less than 1, the gas growth evaluation result is "medium"; if the gas growth coefficient is less than 0.7, the gas growth evaluation result is "poor". It should be noted that the above-mentioned preset gas growth threshold can be set according to actual needs.

[0161] By obtaining the hydrocarbon generation evaluation results based on the hydrocarbon generation evaluation coefficient, the hydrocarbon generation situation of coalbed methane can be unilaterally evaluated, so as to know the total amount of coalbed methane gas, which is helpful to formulate development strategies.

[0162] Please see Figure 2 , Figure 2 The schematic diagram of the seven-element reservoir enrichment recoverable classification evaluation standard according to the embodiment of the present application is shown. In some embodiments, after the enrichment evaluation coefficient is obtained, the enrichment evaluation result can be obtained based on the enrichment evaluation coefficient. Accordingly, when the enrichment evaluation coefficient includes the gas escape coefficient, the fracture development coefficient and the water body distribution coefficient, the corresponding evaluation result can be obtained according to the corresponding evaluation standard based on the gas escape coefficient, the fracture development coefficient and the water body distribution coefficient.

[0163] For example, the evaluation criteria for gas emission are: gas emission coefficient less than or equal to 0.2 is "excellent", gas emission coefficient greater than 0.2 and less than or equal to 0.4 is "medium", and gas emission coefficient greater than 0.4 is "poor". The evaluation criteria for fracture responsibility are fracture development coefficient less than or equal to 2 is "excellent", fracture development coefficient greater than 2 and less than or equal to 5 is "medium", and fracture development coefficient greater than 5 is "poor". The evaluation criteria for the degree of hydrodynamic influence are water body distribution coefficient less than or equal to 2 is "excellent", water body distribution coefficient greater than 2 and less than or equal to 6 is "medium", and water body distribution coefficient greater than 6 is "poor".

[0164] It should be noted that the above-mentioned evaluation criteria can be set based on actual conditions, and this embodiment does not limit this.

[0165] By obtaining the enrichment evaluation results based on the enrichment evaluation coefficient, the gas enrichment of coalbed methane can be unilaterally evaluated, so as to understand the gas enrichment of coalbed methane and help formulate development strategies.

[0166] Please see Figure 2 , Figure 2 The schematic diagram of the seven-element reservoir enrichment recoverable classification evaluation standard according to the embodiment of the present application is shown. In some embodiments, after obtaining the recoverable evaluation coefficient, the recoverable evaluation result can be obtained based on the recoverable evaluation coefficient. Accordingly, when the recoverable evaluation coefficient includes the structural control coefficient, the coal body development coefficient and the stress concentration coefficient, the corresponding evaluation result can be obtained according to the corresponding evaluation standard based on the structural control coefficient, the coal body development coefficient and the stress concentration coefficient.

[0167] For example, the evaluation criteria for the degree of structural development are: structural control coefficient less than or equal to 0.5 is "excellent", structural control coefficient greater than 0.5 and less than or equal to 2 is "medium", and structural control coefficient greater than 2 is "poor". The evaluation criteria for the degree of coal integrity are: coal body development coefficient greater than or equal to 0.7 is "excellent", coal body development coefficient greater than or equal to 0.6 and less than 0.7 is "medium", and coal body development coefficient less than 0.6 is "poor". The evaluation criteria for the magnitude of ground stress are: stress concentration coefficient less than or equal to 0.2 is "excellent", stress concentration coefficient greater than 0.2 and less than or equal to 0.6 is "medium", and stress concentration coefficient greater than 0.6 is "poor".

[0168] It should be noted that the above-mentioned evaluation criteria can be set based on actual conditions, and this embodiment does not limit this.

[0169] By obtaining the recoverable evaluation results based on the recoverable evaluation coefficient, the recoverable of coalbed methane can be unilaterally evaluated, so as to understand the recoverable situation of coalbed methane and help formulate development strategies.

[0170] Step 230: Based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, a comprehensive evaluation result is obtained, and based on the comprehensive evaluation result, a coalbed methane reservoir enrichment and recoverability evaluation result is obtained.

[0171] In this embodiment, after obtaining the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, a comprehensive evaluation result can be further calculated, so that based on the comprehensive evaluation result, the coalbed methane reservoir enrichment recoverable evaluation result can be quantitatively obtained. After obtaining the comprehensive evaluation result, the comprehensive evaluation result can be compared with the preset evaluation threshold to obtain the final coalbed methane reservoir enrichment recoverable evaluation result, and the coalbed methane reservoir enrichment recoverable evaluation result can be excellent, medium or poor.

[0172] In some embodiments, in order to accurately obtain the comprehensive evaluation result, the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient may be normalized respectively, and then the average value of the coefficients is calculated to obtain the comprehensive evaluation result. Specifically, the comprehensive evaluation result is obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, including the following steps:

[0173] First, the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient are normalized to obtain a normalized hydrocarbon generation evaluation coefficient, a normalized enrichment evaluation coefficient and a normalized recoverable evaluation coefficient;

[0174] Then, the average values ​​of the normalized hydrocarbon generation evaluation coefficient, the normalized enrichment evaluation coefficient and the normalized recoverable evaluation coefficient are calculated to obtain a comprehensive evaluation result.

[0175] In this embodiment, the above normalization is to convert each coefficient into a certain range to facilitate calculation and comparison. Specifically, different normalization methods can be used according to actual conditions.

[0176] For example, when the hydrocarbon generation evaluation coefficient includes the gas growth coefficient, the enrichment evaluation coefficient includes the gas escape coefficient, the fracture development coefficient, and the water distribution coefficient, and the mining evaluation coefficient includes the structural control coefficient, the coal body development coefficient, and the stress concentration coefficient, the normalized comprehensive evaluation result calculation formula can be constructed as follows:

[0177] Among them, G r is the gas growth coefficient (dimensionless); G e is the gas escape coefficient (dimensionless); F ai is the fracture development coefficient (dimensionless); W i is the water distribution coefficient; W max is the regional maximum water distribution coefficient (m 3 / d﹒ m); ε is the structural control coefficient;max is the regional maximum structural control coefficient (per km 2 );H ci is the coal body development coefficient (dimensionless); σ ci is the stress concentration coefficient; Y is the comprehensive evaluation result. The larger the value of Y is, the better the coalbed methane enrichment conditions, the superior permeability, and the stronger the reservoir reformability. max and W max The value of can be obtained by calculating multiple values ​​according to the method of steps 210-220 above and taking the maximum value.

[0178] The hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient are normalized, and then the average of the coefficients is calculated to obtain a comprehensive evaluation result. Since the normalization process is compared with the maximum value, the normalized data is more accurate, thereby obtaining a more accurate comprehensive evaluation result.

[0179] In some embodiments, considering that the above normalized comprehensive evaluation process is relatively complicated and the amount of calculation is large, it can be considered to compare the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient with the standard value respectively, and assign different weights to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, and use a logarithmic function to concentrate the comprehensive evaluation calculation results within a specific interval. Specifically, the comprehensive evaluation results are obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, including the following steps:

[0180] First, obtaining standard values ​​corresponding to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient respectively;

[0181] In this embodiment, the standard values ​​corresponding to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient may be empirical values ​​set according to actual conditions.

[0182] Then, the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient are respectively compared with their corresponding standard values ​​to obtain a plurality of ratios;

[0183] Finally, based on the preset weights and the multiple ratios, a logarithmic function is used to calculate and obtain a comprehensive evaluation result.

[0184] In this embodiment, the construction of the logarithmic function can be specifically determined based on the correlation between each coefficient and the development effect. For example: when the hydrocarbon generation evaluation coefficient includes the gas growth coefficient, the enrichment evaluation coefficient includes the gas escape coefficient, the fracture development coefficient, and the water body distribution coefficient, and the recoverable evaluation coefficient includes the structural control coefficient, the coal body development coefficient, and the stress concentration coefficient, the larger the gas growth coefficient and the coal body development coefficient, the more favorable it is for coalbed methane development, and it is positively correlated with the development effect; the larger the gas escape coefficient, the fracture development coefficient, the water body distribution coefficient, the structural control coefficient, and the stress concentration coefficient, the more unfavorable it is for coalbed methane development, and it is negatively correlated with the development effect. Therefore, the calculation formula for the normalized comprehensive evaluation result can be obtained as follows:

[0185] Among them, G r is the gas growth coefficient; G rstd is the standard value of gas growth coefficient; G e is the gas escape coefficient; G estd is the standard value of gas escape coefficient; F ai is the fracture development coefficient; F aistd is the standard value of fracture development coefficient; W i is the water distribution coefficient; W istd is the standard value of water distribution coefficient; ε-structural control coefficient (unit / km 2 ); std is the standard value of the structural control coefficient (pieces / km 2 );H ci is the coal body development coefficient, H cistd is the standard value of coal body development coefficient; σ ci is the stress concentration coefficient; σ cistd is the standard value of stress concentration coefficient; Y is the comprehensive evaluation result. The larger the value of Y is, the better the coalbed methane enrichment conditions, the superior permeability and the stronger the reservoir reformability.

[0186] By comparing the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient with the standard values ​​respectively, and assigning different weights to the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient, a comprehensive evaluation result is obtained by using a logarithmic function. Compared with the method of obtaining the comprehensive evaluation result by taking the average value of the coefficient, the amount of calculation is greatly reduced, and the comprehensive evaluation result can be obtained quickly. At the same time, the comprehensive evaluation calculation results can be concentrated in a specific interval for easy calculation.

[0187] Please see Figure 3 , Figure 3The schematic diagram of the coalbed methane evaluation process according to the embodiment of the present application is schematically shown. First, the evaluation parameters of coalbed methane are obtained based on drilling, logging, seismic interpretation results, fracturing, and drainage data, and then the gas growth coefficient, gas escape coefficient, fracture development coefficient, water body distribution coefficient, structural control coefficient, coal body development coefficient, and stress concentration coefficient are calculated respectively, and then the above 7 coefficients are normalized, and finally a comprehensive evaluation factor is obtained, that is, a comprehensive evaluation result, and then the coalbed methane reservoir enrichment and recoverable evaluation result is obtained. When the coefficient normalization process does not meet the conditions, it returns to recalculate the gas growth coefficient, gas escape coefficient, fracture development coefficient, water body distribution coefficient, structural control coefficient, coal body development coefficient, and stress concentration coefficient.

[0188] In the above implementation process, by obtaining the evaluation parameters of coalbed methane, based on the evaluation parameters of coalbed methane, a preset evaluation factor model is used to calculate the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient, wherein the preset evaluation factor model is used to quantitatively characterize the status of coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverable, and a comprehensive evaluation result is obtained based on the hydrocarbon generation evaluation coefficient, enrichment evaluation coefficient and recoverable evaluation coefficient, and based on the comprehensive evaluation result, the enrichment and recoverable evaluation result of the coalbed methane reservoir is obtained. By evaluating the total gas generation scale, gas distribution status and gas recoverable status of coalbed methane reservoirs in the three stages of hydrocarbon generation, enrichment and recoverable from coalbed methane accumulation to development, and establishing a refined selection evaluation method, coalbed methane can be evaluated more comprehensively, and the accuracy of the enrichment and recoverable evaluation of coalbed methane reservoirs is improved. At the same time, the hydrocarbon generation can be evaluated by the gas generation and adsorption capacity of coal rocks; the gas enrichment can be evaluated by the preservation conditions of coalbed methane reservoirs, the influence of faults on gas enrichment, and the influence of groundwater on gas enrichment; the recoverability of coalbed methane can be evaluated by the influence of microstructure on the recoverability of coalbed methane, the influence of coal rock damage on recoverability, and the influence of ground stress differences on recoverability, and then construct seven coefficients of gas growth, gas escape, fault development, water distribution, structural control, coal body development, and stress concentration and dispersion for classification evaluation, realizing the seven-element classification evaluation, thus establishing a refined selection area evaluation method, evaluating and quantitatively characterizing the "excellent", "medium", and "poor" reservoirs, realizing the refined evaluation of coalbed methane, and further improving the accuracy of the evaluation of the enrichment and recoverability of coalbed methane reservoirs. At the same time, based on the seven-element classification evaluation, a comprehensive evaluation formula is established to quantitatively characterize the coalbed methane reservoir, realizing the refined optimization of coalbed methane development areas, and providing theoretical support for selecting development methods and formulating development countermeasures.

[0189] For example, according to the seven-element evaluation results of coalbed methane enrichment and recoverability, seven wells were deployed in a certain well area. The drilling results showed that the coalbed methane content in this area was 16-21m 3 / t, and 5 test wells produced 1000-2000m 3 / d gas production. The proven gas-bearing area is 93.3km2, and the geological reserves of coal-bed methane are 134.86×108m3. Fig.11 shown.

[0190] Figure 1 FIG. 1 is a flow chart of a method for evaluating the enrichment and recoverability of a coalbed methane reservoir in one embodiment. It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0191] Please see Fig.12 , Fig.12 The schematic diagram of the structure of a coalbed methane reservoir enrichment and recoverability evaluation device according to an embodiment of the present application is schematically shown. This embodiment provides a coalbed methane reservoir enrichment and recoverability evaluation device, including an acquisition module 410, a first calculation module 420 and a second calculation module 430, wherein:

[0192] An acquisition module 410 is used to acquire evaluation parameters of coalbed methane;

[0193] The first calculation module 420 is used to calculate the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient based on the evaluation parameters of the coalbed methane using a preset evaluation factor model; the preset evaluation factor model is used to quantitatively characterize the status of the coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverability;

[0194] The second calculation module 430 is used to obtain a comprehensive evaluation result based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, and obtain a coalbed methane reservoir enrichment and recoverability evaluation result based on the comprehensive evaluation result.

[0195] Wherein, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model;

[0196] The first calculation module includes:

[0197] A first coefficient calculation submodule is used to calculate the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane based on the evaluation parameters of the coalbed methane using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient;

[0198] A second coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane using the second evaluation coefficient model to obtain the enrichment evaluation coefficient;

[0199] The third coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane and adopt the third evaluation coefficient model to obtain the recoverable evaluation coefficient.

[0200] The evaluation parameters of the coalbed methane include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model;

[0201] The first coefficient calculation submodule includes:

[0202] A gas growth coefficient calculation unit, used to calculate the gas growth coefficient using the first evaluation coefficient model based on the coal rock vitrinite reflectance and the maximum Langmuir volume;

[0203] The first determination unit is used to obtain a hydrocarbon generation evaluation coefficient based on the gas growth coefficient.

[0204] The evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model;

[0205] The second coefficient calculation submodule includes:

[0206] A gas dissipation coefficient calculation unit, used to calculate the gas dissipation coefficient based on the Langmuir volume and the measured gas content using the gas dissipation coefficient model;

[0207] A fracture development coefficient calculation unit, used to calculate the fracture development coefficient based on the fault parameters and using the fracture development coefficient model;

[0208] A water body distribution coefficient calculation unit, used to calculate the water body distribution coefficient using the water body distribution coefficient model based on the water production, drainage days and liquid level drop depth;

[0209] The second determination unit is used to obtain an enrichment evaluation coefficient based on the gas escape coefficient, the fracture development coefficient and the water body distribution coefficient.

[0210] The evaluation parameters of coalbed methane also include anticline number, syncline number, area, primary-fragmentation volume, total volume of coal seam, maximum horizontal principal stress, minimum principal stress and vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model;

[0211] The third coefficient calculation submodule includes:

[0212] A control coefficient calculation unit, used to calculate the structural control coefficient using the structural control coefficient model based on the number of anticlines, the number of synclines and the area;

[0213] A coal body development coefficient calculation unit, used to calculate the coal body development coefficient using the coal body development coefficient model based on the fracture development coefficient, the primary-fragmentation volume and the total volume of the coal seam;

[0214] A stress concentration coefficient calculation unit, used for calculating the stress concentration coefficient by using the stress concentration coefficient model based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress;

[0215] The third determination unit is used to obtain a mining evaluation coefficient based on the structural control coefficient, the coal body development coefficient and the stress concentration coefficient.

[0216] The coalbed methane reservoir enrichment and recoverability evaluation device includes a processor and a memory. The above-mentioned acquisition module 410, the first calculation module 420 and the second calculation module 430 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0217] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the accuracy of the evaluation of the enrichment and recoverability of the coalbed methane reservoir can be improved by adjusting the kernel parameters.

[0218] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0219] An embodiment of the present invention provides a machine-readable storage medium on which a program is stored. When the program is executed by a processor, the method for evaluating the enrichment and recoverability of a coalbed methane reservoir is implemented.

[0220] An embodiment of the present invention provides a processor, which is used to run a program, wherein the coalbed methane reservoir enrichment and recoverability evaluation method is executed when the program is running.

[0221] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.13 As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor A01, a method for evaluating the enrichment and recoverability of a coalbed methane reservoir is implemented. The display screen A04 of the computer device can be a liquid crystal display or an electronic ink display, and the input device A05 of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0222] Those skilled in the art will understand that Fig.13 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0223] In one embodiment, the coalbed methane reservoir enrichment and recoverability evaluation device provided in the present application can be implemented in the form of a computer program. The computer program can be used in Fig.13 The computer device shown in the figure is run. The memory of the computer device can store various program modules constituting the coalbed methane reservoir enrichment and recoverability evaluation device, for example, Fig.12 The acquisition module 410, the first calculation module 420 and the second calculation module 430 are shown. The computer program composed of various program modules enables the processor to execute the steps of the coalbed methane reservoir enrichment and recoverability evaluation method of each embodiment of the present application described in this specification.

[0224] Fig.13 The computer device shown can be Fig.12 The acquisition module 410 in the coalbed methane reservoir enrichment and recoverability evaluation device shown executes step 210. The computer device may execute step 220 through the first calculation module 420. The computer device may execute step 230 through the second calculation module 430.

[0225] The embodiment of the present application provides an electronic device, which includes: at least one processor; a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the above-mentioned coalbed methane reservoir enrichment and recoverability evaluation method by executing the instructions stored in the memory. When the processor executes the instructions, the following steps are implemented: obtaining coalbed methane evaluation parameters;

[0226] Based on the evaluation parameters of the coalbed methane, a preset evaluation factor model is used to calculate a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient;

[0227] Based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, a comprehensive evaluation result is obtained, and based on the comprehensive evaluation result, a coalbed methane reservoir enrichment and recoverability evaluation result is obtained;

[0228] The preset evaluation factor model is used to quantitatively characterize the status of coalbed methane from three stages: hydrocarbon generation, enrichment and recoverability.

[0229] In one embodiment, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model;

[0230] The evaluation parameters based on the coalbed methane are calculated using a preset evaluation factor model to obtain a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient, including:

[0231] Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient;

[0232] Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the second evaluation coefficient model to obtain an enrichment evaluation coefficient;

[0233] Based on the evaluation parameters of the coalbed methane, the third evaluation coefficient model is used to calculate the evaluation coefficient of the coalbed methane enrichment stage to obtain the recoverable evaluation coefficient.

[0234] In one embodiment, the evaluation parameters of the coalbed methane include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model;

[0235] The evaluation parameters of the coalbed methane are based on the first evaluation coefficient model, and the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated to obtain the hydrocarbon generation evaluation coefficient, including:

[0236] Based on the coal rock vitrinite reflectance and the maximum Langmuir volume, the gas growth coefficient is calculated using the first evaluation coefficient model;

[0237] Based on the gas growth coefficient, a hydrocarbon generation evaluation coefficient is obtained.

[0238] In one embodiment, the gas growth coefficient model is expressed as:

[0239] Among them, G r is the gas growth coefficient, R o is the reflectance of coal vitrinite, v maxL is the maximum Langmuir volume.

[0240] In one embodiment, the evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model;

[0241] The method of calculating the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameter of the coalbed methane and using the second evaluation coefficient model to obtain the enrichment evaluation coefficient includes:

[0242] Based on the Langmuir volume and the measured gas content, the gas escape coefficient is calculated using the gas escape coefficient model;

[0243] Based on the fault parameters, the fracture development coefficient is calculated using the fracture development coefficient model;

[0244] Based on the water production, drainage days and liquid level drop depth, the water distribution coefficient is calculated using the water distribution coefficient model;

[0245] Based on the gas escape coefficient, fracture development coefficient and water body distribution coefficient, an enrichment evaluation coefficient is obtained.

[0246] In one embodiment, the gas emission coefficient model is expressed as:

[0247] Among them, G e is the gas escape coefficient, V L is the Langmuir volume, and V is the measured gas content.

[0248] In one embodiment, the fracture growth coefficient model is expressed as:

[0249] Among them, F ai is the fracture growth coefficient, S fm is the fault damage area, S m is the unit area, and n is the number of cells.

[0250] In one embodiment, the water body distribution coefficient model is expressed as:

[0251] Among them, W i is the water distribution coefficient, Q W is the water production, t is the number of drainage days, and D is the depth of liquid level drop.

[0252] In one embodiment, the evaluation parameters of the coalbed methane further include anticline number, syncline number, area, primary-fracture volume, total volume of the coal seam, maximum horizontal principal stress, minimum principal stress and vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model;

[0253] The evaluation parameters based on the coalbed methane are used to calculate the evaluation coefficient of the coalbed methane enrichment stage using the third evaluation coefficient model to obtain the recoverable evaluation coefficient, including:

[0254] Based on the number of anticlines, the number of synclines and the area, the structural control coefficient is calculated using the structural control coefficient model;

[0255] Based on the fracture development coefficient, primary-fragmentation volume and total volume of the coal seam, the coal body development coefficient is calculated using the coal body development coefficient model;

[0256] Based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, the stress concentration coefficient is calculated using the stress concentration coefficient model;

[0257] Based on the structural control coefficient, coal body development coefficient and stress concentration coefficient, a mining evaluation coefficient is obtained.

[0258] In one embodiment, the construction control coefficient model is expressed as:

[0259] Among them, ε is the structural control coefficient, A i is the anticline number, X i -syncline number, S is the area.

[0260] In one embodiment, the coal body development coefficient model is expressed as:

[0261] Among them, H ci is the coal body development coefficient, F ai is the fracture growth coefficient, V i is the primary-fragmentation volume, and V is the total volume of the coal seam.

[0262] In one embodiment, the stress concentration coefficient model is expressed as:

[0263] Among them, σ ci is the stress concentration coefficient, σ maxis the maximum horizontal principal stress, σ min is the minimum principal stress, σ H is the vertical principal stress.

[0264] In one embodiment, the comprehensive evaluation result obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient includes:

[0265] Normalizing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient to obtain a normalized hydrocarbon generation evaluation coefficient, a normalized enrichment evaluation coefficient and a normalized recoverable evaluation coefficient;

[0266] The average values ​​of the normalized hydrocarbon generation evaluation coefficient, the normalized enrichment evaluation coefficient and the normalized recoverable evaluation coefficient are calculated to obtain a comprehensive evaluation result.

[0267] In one embodiment, the comprehensive evaluation result is expressed as:

[0268] Among them, G r is the gas growth coefficient, G e is the gas escape coefficient, F ai is the fracture growth coefficient, W i is the water distribution coefficient, W max is the regional maximum water distribution coefficient, ε is the structural control coefficient, and ε max is the regional maximum structural control coefficient, H ci is the coal body development coefficient, σ ci is the stress concentration coefficient, and Y is the comprehensive evaluation result.

[0269] In one embodiment, the comprehensive evaluation result obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient includes:

[0270] Obtaining standard values ​​corresponding to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient respectively;

[0271] Respectively comparing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient with their corresponding standard values ​​to obtain a plurality of ratios;

[0272] Based on the preset weights and the multiple ratios, a comprehensive evaluation result is obtained by using a logarithmic function calculation.

[0273] In one embodiment, the comprehensive evaluation result is expressed as:

[0274] Among them, G r is the gas growth coefficient, G rstd is the standard value of the gas growth coefficient, G eis the gas escape coefficient, G estd is the standard value of gas escape coefficient, F ai is the fracture growth coefficient, F aistd is the standard value of fracture growth coefficient, W i is the water distribution coefficient, W istd is the standard value of water distribution coefficient, ε is the structural control coefficient, and ε std is the standard value of the construction control coefficient; H ci is the coal body development coefficient, H cistd is the standard value of coal body development coefficient, σ ci is the stress concentration coefficient, σ cistd is the standard value of stress concentration coefficient, and Y is the comprehensive evaluation result.

[0275] In one embodiment, at least one of the following steps is also included:

[0276] Based on the hydrocarbon generation evaluation coefficient, obtaining a hydrocarbon generation evaluation result;

[0277] Based on the enrichment evaluation coefficient, obtaining an enrichment evaluation result;

[0278] Based on the recoverable evaluation coefficient, a recoverable evaluation result is obtained.

[0279] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0280] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0281] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0282] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0283] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0284] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0285] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0286] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for evaluating the enrichment and recoverability of coalbed methane reservoirs, characterized in that: include: Obtain evaluation parameters of coalbed methane; Based on the evaluation parameters of the coalbed methane, a preset evaluation factor model is used to calculate a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient; Based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, a comprehensive evaluation result is obtained, and based on the comprehensive evaluation result, a coalbed methane reservoir enrichment and recoverability evaluation result is obtained; The preset evaluation factor model is used to quantitatively characterize the status of coalbed methane from three stages: hydrocarbon generation, enrichment and recoverability; Wherein, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model; The evaluation parameters based on the coalbed methane are calculated using a preset evaluation factor model to obtain a hydrocarbon generation evaluation coefficient, an enrichment evaluation coefficient and a recoverable evaluation coefficient, including: Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient; Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the second evaluation coefficient model to obtain an enrichment evaluation coefficient; Based on the evaluation parameters of the coalbed methane, the evaluation coefficient of the coalbed methane enrichment stage is calculated using the third evaluation coefficient model to obtain a recoverable evaluation coefficient; The evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model; The method of calculating the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameter of the coalbed methane and using the second evaluation coefficient model to obtain the enrichment evaluation coefficient includes: Based on the Langmuir volume and the measured gas content, the gas escape coefficient is calculated using the gas escape coefficient model; Based on the fault parameters, the fracture development coefficient is calculated using the fracture development coefficient model; Based on the water production, drainage days and liquid level drop depth, the water distribution coefficient is calculated using the water distribution coefficient model; Based on the gas escape coefficient, fracture development coefficient and water body distribution coefficient, an enrichment evaluation coefficient is obtained; The evaluation parameters of coalbed methane also include anticline number, syncline number, area, primary-fragmentation volume, total volume of coal seam, maximum horizontal principal stress, minimum principal stress and vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model; The evaluation parameters based on the coalbed methane are used to calculate the evaluation coefficient of the coalbed methane enrichment stage using the third evaluation coefficient model to obtain the recoverable evaluation coefficient, including: Based on the number of anticlines, the number of synclines and the area, the structural control coefficient is calculated using the structural control coefficient model; Based on the fracture development coefficient, primary-fragmentation volume and total volume of the coal seam, the coal body development coefficient is calculated using the coal body development coefficient model; Based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress, the stress concentration coefficient is calculated using the stress concentration coefficient model; Based on the structural control coefficient, coal body development coefficient and stress concentration coefficient, a mining evaluation coefficient is obtained; The evaluation parameters of the coalbed methane also include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model; The evaluation parameters of the coalbed methane are based on the first evaluation coefficient model, and the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane is calculated to obtain the hydrocarbon generation evaluation coefficient, including: Based on the coal rock vitrinite reflectance and the maximum Langmuir volume, the gas growth coefficient is calculated using the first evaluation coefficient model; Based on the gas growth coefficient, a hydrocarbon generation evaluation coefficient is obtained.

2. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The gas growth coefficient model is expressed as: Among them, G r is the gas growth coefficient, R o is the reflectance of coal vitrinite, v maxL is the maximum Langmuir volume.

3. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The gas escape coefficient model is expressed as: Among them, G e is the gas escape coefficient, V L is the Langmuir volume, and V is the measured gas content.

4. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The fracture development coefficient model is expressed as: Among them, F ai is the fracture growth coefficient, S fm is the fault damage area, S m is the unit area, and n is the number of cells.

5. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The water distribution coefficient model is expressed as: Among them, W i is the water distribution coefficient, Q W is the water production, t is the number of drainage days, and D is the depth of liquid level drop.

6. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The structural control coefficient model is expressed as: Among them, ε is the structural control coefficient, A i is the anticline number, X i -syncline number, S is the area.

7. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The coal body development coefficient model is expressed as: Among them, H ci is the coal body development coefficient, F ai is the fracture growth coefficient, V i is the primary-fragmentation volume, and V is the total volume of the coal seam.

8. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The stress concentration coefficient model is expressed as: Among them, σ ci is the stress concentration coefficient, σ max is the maximum horizontal principal stress, σ min is the minimum principal stress, σ H is the vertical principal stress.

9. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The comprehensive evaluation result is obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, including: Normalizing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient to obtain a normalized hydrocarbon generation evaluation coefficient, a normalized enrichment evaluation coefficient and a normalized recoverable evaluation coefficient; The average values ​​of the normalized hydrocarbon generation evaluation coefficient, the normalized enrichment evaluation coefficient and the normalized recoverable evaluation coefficient are calculated to obtain a comprehensive evaluation result.

10. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 9, characterized in that: The comprehensive evaluation result is expressed as: Among them, G r is the gas growth coefficient, G e is the gas escape coefficient, F ai is the fracture growth coefficient, W i is the water distribution coefficient, W max is the regional maximum water distribution coefficient, ε is the structural control coefficient, and ε max is the regional maximum structural control coefficient, H ci is the coal body development coefficient, σ ci is the stress concentration coefficient, and Y is the comprehensive evaluation result.

11. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: The comprehensive evaluation result is obtained based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient, including: Obtaining standard values ​​corresponding to the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient respectively; Respectively comparing the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient with their corresponding standard values ​​to obtain a plurality of ratios; Based on the preset weights and the multiple ratios, a comprehensive evaluation result is obtained by using a logarithmic function calculation.

12. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 11, characterized in that: The comprehensive evaluation result is expressed as: Among them, G r is the gas growth coefficient, G rstd is the standard value of the gas growth coefficient, G e is the gas escape coefficient, G estd is the standard value of gas escape coefficient, F ai is the fracture growth coefficient, F aistd is the standard value of fracture growth coefficient, W i is the water distribution coefficient, W istd is the standard value of water distribution coefficient, ε is the structural control coefficient, and ε std is the standard value of the construction control coefficient; H ci is the coal body development coefficient, H cistd is the standard value of coal body development coefficient, σ ci is the stress concentration coefficient, σ cistd is the standard value of stress concentration coefficient, and Y is the comprehensive evaluation result.

13. The coalbed methane reservoir enrichment and recoverability evaluation method according to claim 1, characterized in that: Also includes at least one of the following steps: Based on the hydrocarbon generation evaluation coefficient, obtaining a hydrocarbon generation evaluation result; Based on the enrichment evaluation coefficient, obtaining an enrichment evaluation result; Based on the recoverable evaluation coefficient, a recoverable evaluation result is obtained.

14. A coalbed methane reservoir enrichment and recoverability evaluation device, characterized in that: include: An acquisition module is used to obtain evaluation parameters of coalbed methane; The first calculation module is used to calculate the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverable evaluation coefficient based on the evaluation parameters of the coalbed methane using a preset evaluation factor model; the preset evaluation factor model is used to quantitatively characterize the status of the coalbed methane from the three stages of hydrocarbon generation, enrichment and recoverability; A second calculation module is used to obtain a comprehensive evaluation result based on the hydrocarbon generation evaluation coefficient, the enrichment evaluation coefficient and the recoverability evaluation coefficient, and obtain a coalbed methane reservoir enrichment and recoverability evaluation result based on the comprehensive evaluation result; Wherein, the preset evaluation factor model includes a first evaluation coefficient model, a second evaluation coefficient model and a third evaluation coefficient model; The first calculation module includes: A first coefficient calculation submodule, used to calculate the evaluation coefficient of the hydrocarbon generation stage of the coalbed methane based on the evaluation parameters of the coalbed methane using the first evaluation coefficient model to obtain the hydrocarbon generation evaluation coefficient; A second coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane using the second evaluation coefficient model to obtain the enrichment evaluation coefficient; A third coefficient calculation submodule is used to calculate the evaluation coefficient of the coalbed methane enrichment stage based on the evaluation parameters of the coalbed methane using the third evaluation coefficient model to obtain a recoverable evaluation coefficient; The evaluation parameters of the coalbed methane include Langmuir volume, measured gas content, fault parameters, water production, drainage days and liquid level drop depth, and the second evaluation coefficient model includes a gas escape coefficient model, a fault development coefficient model and a water body distribution coefficient model; The second coefficient calculation submodule includes: A gas dissipation coefficient calculation unit, used to calculate the gas dissipation coefficient based on the Langmuir volume and the measured gas content using the gas dissipation coefficient model; A fracture development coefficient calculation unit, used to calculate the fracture development coefficient based on the fault parameters and using the fracture development coefficient model; A water body distribution coefficient calculation unit, used to calculate the water body distribution coefficient using the water body distribution coefficient model based on the water production, drainage days and liquid level drop depth; A second determination unit is used to obtain an enrichment evaluation coefficient based on the gas escape coefficient, the fracture development coefficient and the water body distribution coefficient; The evaluation parameters of coalbed methane also include anticline number, syncline number, area, primary-fragmentation volume, total volume of coal seam, maximum horizontal principal stress, minimum principal stress and vertical principal stress, and the third evaluation coefficient model includes a structural control coefficient model, a coal body development coefficient model and a stress concentration coefficient model; The third coefficient calculation submodule includes: A control coefficient calculation unit, used to calculate the structural control coefficient using the structural control coefficient model based on the number of anticlines, the number of synclines and the area; A coal body development coefficient calculation unit, used to calculate the coal body development coefficient using the coal body development coefficient model based on the fracture development coefficient, the primary-fragmentation volume and the total volume of the coal seam; A stress concentration coefficient calculation unit, used for calculating the stress concentration coefficient by using the stress concentration coefficient model based on the maximum horizontal principal stress, the minimum principal stress and the vertical principal stress; A third determination unit is used to obtain a mining evaluation coefficient based on the structural control coefficient, the coal body development coefficient and the stress concentration coefficient; The evaluation parameters of the coalbed methane also include the coal rock vitrinite reflectance and the maximum Langmuir volume, and the first evaluation coefficient model is a gas growth coefficient model; The first coefficient calculation submodule includes: A gas growth coefficient calculation unit, used to calculate the gas growth coefficient using the first evaluation coefficient model based on the coal rock vitrinite reflectance and the maximum Langmuir volume; The first determination unit is used to obtain a hydrocarbon generation evaluation coefficient based on the gas growth coefficient.

15. An electronic device, characterized in that: The electronic device includes: at least one processor; a memory connected to the at least one processor; Wherein, the memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the coalbed methane reservoir enrichment and recoverability evaluation method described in any one of claims 1 to 13 by executing the instructions stored in the memory.

16. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the coalbed methane reservoir enrichment and recoverability evaluation method according to any one of claims 1 to 13.

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