A method and system for evaluating vertical stability of gas storage faults

Abstract

The present invention relates to a method and system for evaluating the vertical stability of a gas storage fault, and belongs to the field of underground gas storage construction safety technology. The evaluation method comprises: establishing a three-dimensional fine stress field model of the gas storage; extracting the dynamic operation data of the gas storage based on the three-dimensional fine stress field model of the gas storage and the dynamic change data of pore pressure; obtaining the cross-section dynamic stress model based on the three-dimensional fine stress field model of the gas storage and the cross-section triangulation method; determining the fault stability index based on the dynamic operation data of the gas storage and the cross-section dynamic stress model; and completing the end face vertical stability evaluation based on the fault stability index. The present invention achieves the characterization of the relationship between the dynamic operation of the gas storage and the pore pressure through the fault index, and further determines the critical pore pressure under the dynamic operation of the gas storage, and realizes the vertical dynamic sealing ability of the fault through the critical pore pressure, solving the problem that it was previously impossible to quantitatively characterize the dynamic sealing of the injection and production of the gas storage fault.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground gas storage construction safety, and in particular relates to a method and system for evaluating the vertical stability of a gas storage fault. Background Art

[0002] The sealing evaluation of gas storage reservoirs is the primary indicator that determines whether the reservoir can be built, the key factor affecting safe operation, and an important basis for increasing pressure and expanding capacity. It is of great significance. Increasing pressure through quantitative sealing evaluation is also the most direct and effective way to improve the operating efficiency of gas reservoirs. However, under high-speed and high-intensity injection and production and alternating load conditions, gas reservoirs are exposed to high-risk hazards such as fault instability, which may cause vertical leakage, combustion, and explosion along the fault. The main reason for these risks is the rapid change in formation pressure during the injection and production process and the resulting changes in the underground stress field in the reservoir area. There is an urgent need for quantitative evaluation of the vertical stability of faults to guide the dynamic assessment of fault stability during the operation of gas storage reservoirs, so as to ensure the pressure increase and capacity expansion of gas storage reservoirs under the premise of safe operation.

[0003] At present, gas storage facilities at home and abroad usually use static qualitative sealing evaluation methods such as mudstone smear coefficient, which cannot clearly determine the pressure limit of the fault. Therefore, most domestic and foreign methods use the original formation pressure as the upper limit pressure, and rely on experience to increase the pressure. There are no relevant technical means for quantitative evaluation of the vertical stability of faults and scientific basis for increasing the pressure.

[0004] With the multi-cycle reciprocating injection and production of gas storage, oil, gas and water are repeatedly displaced. The geological conditions and stress fields have undergone tremendous changes compared with the early development stage. The sealing properties of caprocks and faults have become particularly complex. The previous method of simply considering the geological mudstone smear factor is not suitable for the evaluation of multi-cycle injection and production of gas storage. In order to clarify the upper limit of gas storage pressure increase and realize the quantitative prediction of the dynamic sealing properties of faults during the injection and production process of gas storage, it is necessary to carry out the dynamic sealing properties evaluation of faults during injection and production, and study a method that fully considers the geological characteristics and the pressure and stress changes in the reservoir area under the injection and production alternating load conditions to quantitatively characterize the vertical sealing capacity of gas storage faults. Summary of the Invention

[0005] In response to the above problems, the present invention solves the previous problem of being unable to quantitatively characterize the dynamic sealing of gas storage faults during injection and production. By comprehensively considering factors such as geological characteristics and injection and production stress changes, a quantitative evaluation method and system for the vertical stability of gas storage faults is created, and the dynamic sealing pressure limit of the fault is quantified, providing a scientific basis for the pressure-raising operation of the gas storage.

[0006] The first object of the present invention is achieved through the following technical solutions:

[0007] A method for evaluating the vertical stability of a gas storage fault comprises:

[0008] Establish a three-dimensional fine stress field model of the gas storage reservoir;

[0009] Extract gas storage operation dynamic data based on the gas storage 3D fine stress field model and pore pressure dynamic change data;

[0010] Based on the three-dimensional fine stress field model of the gas storage reservoir and the cross-section triangulation method, the cross-section dynamic stress model is obtained;

[0011] Determine the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model;

[0012] Based on the fault stability index, the vertical stability evaluation of the end face is completed.

[0013] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data.

[0014] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir includes the vertical stress of the entire formation segment, the maximum horizontal stress model of the entire formation segment, the minimum horizontal stress model of the entire formation segment, the vertical stress model of the Xinglongtai reservoir segment, the maximum horizontal stress model of the Xinglongtai reservoir segment and the minimum horizontal stress model of the Xinglongtai reservoir segment.

[0015] In an embodiment of the present invention, the pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

[0016] In an embodiment of the present invention, extracting the gas storage reservoir operation dynamic data based on the gas storage reservoir three-dimensional fine stress field model and pore pressure change data includes:

[0017] Based on the 3D fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure, a 4D geostress simulation study of seepage-geostress coupling was conducted;

[0018] Based on four-dimensional ground stress simulation research, dynamic data of gas storage operation is obtained.

[0019] In an embodiment of the present invention, the gas storage operation dynamic data includes three-dimensional Young's modulus dynamic data, three-dimensional minimum horizontal principal stress dynamic data, and three-dimensional maximum horizontal principal stress dynamic data.

[0020] In an embodiment of the present invention, determining the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model includes:

[0021] Determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and cross section dynamic stress model;

[0022] The value of the fault stability index is determined based on the normal stress and shear stress of the cross section.

[0023] In an embodiment of the present invention, the normal stress is determined according to the following formula:

[0024] σ n =0.5(σ1+σ3)+0.5(σ1-σ3)cosβ,

[0025] Among them, σ n is the normal stress, σ1 is the maximum principal stress, σ3 is the minimum principal stress, and β is the angle between the maximum principal stress and the fault plane.

[0026] In an embodiment of the present invention, the shear stress is determined according to the following formula:

[0027] τ net =0.5(σ1-σ3)sinβ,

[0028] Among them, τ net is the shear stress.

[0029] In an embodiment of the present invention, the fault stability index is determined according to the following formula:

[0030] Tau = τ net ' / μ(σ n -P p ),

[0031] Where Tau is the fault stability index, τ net ' is the sum of the shear components of the triaxial principal stresses on the cross section, μ is the cross section sliding friction coefficient, P p is the pore pressure.

[0032] In an embodiment of the present invention, the process of completing the end face vertical stability evaluation based on the fault stability index includes:

[0033] According to the fault stability index, the critical pore pressure is obtained;

[0034] Based on the magnitude of the critical pore pressure, the vertical stability evaluation of the end face is completed.

[0035] The second object of the present invention is achieved through the following technical solutions:

[0036] A gas storage fault vertical stability evaluation system, characterized by comprising: a three-dimensional model building module, an extraction module, a cross-section model module, an analysis module and an evaluation module;

[0037] The three-dimensional model building module is used to build a three-dimensional fine stress field model of the gas storage reservoir;

[0038] The extraction module is used to extract the gas storage reservoir operation dynamic data based on the gas storage reservoir three-dimensional fine stress field model and pore pressure dynamic change data;

[0039] The cross-section model module is used to obtain a cross-section dynamic stress model based on a three-dimensional fine stress field model of the gas storage reservoir and a cross-section triangulation method;

[0040] The analysis module is used to determine the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model;

[0041] The evaluation module is used to complete the vertical stability evaluation of the end face based on the fault stability index.

[0042] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data.

[0043] In an embodiment of the present invention, the extraction module includes a simulation submodule and an operation dynamic submodule;

[0044] The simulation submodule is used to perform four-dimensional geostress simulation of seepage-geostress coupling based on the three-dimensional fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure;

[0045] The obtained operation dynamics submodule is used to obtain the operation dynamics data of the gas storage reservoir based on four-dimensional ground stress simulation research.

[0046] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir includes the vertical stress of the entire formation segment, the maximum horizontal stress model of the entire formation segment, the minimum horizontal stress model of the entire formation segment, the vertical stress model of the Xinglongtai reservoir segment, the maximum horizontal stress model of the Xinglongtai reservoir segment and the minimum horizontal stress model of the Xinglongtai reservoir segment.

[0047] In an embodiment of the present invention, the pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

[0048] In an embodiment of the present invention, the gas storage operation dynamic data includes three-dimensional vertical stress dynamic data, three-dimensional minimum horizontal principal stress dynamic data, and three-dimensional maximum horizontal principal stress dynamic data.

[0049] In an embodiment of the present invention, the analysis module includes a stress submodule and a fault index submodule;

[0050] The stress submodule is used to determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and the cross section dynamic stress model;

[0051] The fault index submodule is used to determine the fault stability index based on the normal stress and shear stress of the cross section.

[0052] The third object of the present invention can be achieved by the following technical solutions:

[0053] An electronic device comprises: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0054] A memory for storing programs and / or instructions;

[0055] a processor for executing the programs and / or instructions;

[0056] Wherein, when executing the program and / or instruction, the processor implements the above-mentioned method for evaluating the vertical stability of the gas storage fault.

[0057] The fourth object of the present invention can be achieved by the following technical solutions:

[0058] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for evaluating the vertical stability of a gas storage fault.

[0059] Beneficial effects of the present invention:

[0060] The method and system for evaluating the vertical stability of a gas storage fault provided by the present invention realize the characterization of the relationship between the gas storage operation dynamics (i.e., comprehensive characterization of geological characteristics and pressure and stress changes in the reservoir area under injection-production alternating load conditions) and pore pressure through the fault index, and further determine the critical pore pressure under the gas storage operation dynamics, and realize the vertical dynamic sealing capacity of the fault through the critical pore pressure, solving the problem that the dynamic sealing of the injection-production fault of the gas storage reservoir could not be quantitatively characterized in the past. By comprehensively considering the geological characteristics and the dynamic stress changes of injection-production, a quantitative evaluation of the vertical sealing capacity of the fault of the oilfield gas storage reservoir is realized, the evaluation accuracy is improved, the dynamic sealing pressure limit of the fault is determined, and a scientific basis is provided for increasing the pressure and capacity of the gas storage reservoir. At the same time, the upper limit operating pressure of each gas reservoir in the gas storage group is improved, the working gas volume of the gas storage group is increased, and the efficient and safe operation of the Shuangtaizi gas storage group is fundamentally guaranteed, and the fault sealing evaluation has achieved a leap from static to dynamic, qualitative to quantitative, and single to diversified evaluation.

[0061] The present invention provides a method for quantitatively evaluating the vertical stability of gas storage faults. The method is suitable for determining and quantitatively evaluating the upper limit pressure during the construction and operation of gas storage.

[0062] The present invention provides a quantitative evaluation method for the vertical stability of gas storage faults, which is of great significance for quantitatively evaluating the sealing performance of gas storage groups, guiding the construction of gas storages, and ensuring the efficient operation of gas storages.

[0063] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0065] Figure 1 A flow chart showing a method for evaluating the vertical stability of a gas storage fault according to an embodiment of the present invention is shown;

[0066] Figure 2 The vertical stress model of the entire formation segment in the three-dimensional fine stress field model of the gas storage reservoir according to an embodiment of the present invention is shown;

[0067] Figure 3 The maximum horizontal stress model of the entire formation segment in the three-dimensional fine stress field model of the gas storage reservoir according to an embodiment of the present invention is shown;

[0068] Figure 4 The minimum horizontal stress model of the entire formation segment in the three-dimensional fine stress field model of the gas storage reservoir according to an embodiment of the present invention is shown;

[0069] Figure 5 The vertical stress model of the Xinglongtai reservoir section in the three-dimensional fine stress field model of the gas storage reservoir according to the embodiment of the present invention is shown;

[0070] Figure 6 The maximum horizontal stress model of the Xinglongtai reservoir section in the three-dimensional fine stress field model of the gas storage according to an embodiment of the present invention is shown;

[0071] Figure 7 The vertical stress model of the Xinglongtai reservoir section in the three-dimensional fine stress field model of the gas storage reservoir according to the embodiment of the present invention is shown;

[0072] Figure 8 A three-dimensional pore pressure model according to an embodiment of the present invention is shown;

[0073] Figure 9 A three-dimensional vertical stress dynamic model according to an embodiment of the present invention is shown;

[0074] Figure 10 A three-dimensional minimum horizontal principal stress dynamic model according to an embodiment of the present invention is shown;

[0075] Figure 11 A three-dimensional maximum horizontal principal stress dynamic model according to an embodiment of the present invention is shown;

[0076] Figure 12 shows a distribution diagram of fault stability parameters under dynamic data of gas storage operation according to an embodiment of the present invention;

[0077] Figure 13 A framework diagram of a gas storage fault vertical stability evaluation system according to an embodiment of the present invention is shown;

[0078] In the figure: 1. 3D model building module; 2. Extraction module; 3. Section model module; 4. Analysis module; 5. Evaluation module. DETAILED DESCRIPTION

[0079] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0080] like Figure 1 A method for evaluating the vertical stability of a gas storage fault according to an embodiment of the present invention is characterized by comprising:

[0081] Step S1, establishing a three-dimensional fine stress field model of a gas storage reservoir;

[0082] Step S2: extracting gas storage operation dynamic data based on the gas storage three-dimensional fine stress field model and pore pressure dynamic change data;

[0083] Step S3: obtaining a cross-section dynamic stress model based on the three-dimensional fine stress field model of the gas storage reservoir and the cross-section triangulation method;

[0084] Step S4: determining the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model;

[0085] Step S5: Based on the fault stability index, complete the end face vertical stability evaluation.

[0086] In the embodiment of the present invention, in step S1, the three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data, wherein the well logging, testing, core data, seismic interpretation results, and geological analysis data specifically include cuttings logging, mud density, well logging data (including density, acoustic wave, gamma, resistance, well diameter, etc.), pressure testing, formation fracture testing, and seismic structural interpretation results;

[0087] In the specific operation, during the construction of the three-dimensional fine stress field model of the gas storage reservoir, the geological and mechanical modeling technology was upgraded three times by iterative cycles to infinitely restore the actual underground situation. A new single-well + three-dimensional co-simulation method was newly developed to integrate density, layer velocity and elastic parameters to complete the construction of the three-dimensional fine stress field model of the gas storage reservoir and realize the quantitative characterization of the three-dimensional geological and mechanical model.

[0088] The three-dimensional fine stress field model of the gas storage reservoir includes a vertical stress model of the entire formation segment (such as Figure 2 As shown in the figure), the maximum horizontal stress model of the entire formation segment (as ... Figure 3 As shown in ), the minimum horizontal stress model for the entire formation segment (as shown in Figure 4 As shown in the figure), the vertical stress model of the Xinglongtai reservoir section (as shown in the figure) Figure 5 As shown in the figure), the maximum horizontal stress model of the Xinglongtai reservoir section (as shown in the figure) Figure 6 ) and the minimum horizontal stress model of the Xinglongtai reservoir section (as shown in Figure 7 shown).

[0089] In step S2, extracting the gas storage operation dynamic data based on the gas storage three-dimensional fine stress field model and the pore pressure dynamic change data includes:

[0090] Based on the 3D fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure, a 4D geostress simulation study of seepage-geostress coupling was conducted;

[0091] Based on four-dimensional ground stress simulation research, dynamic data of gas storage operation is obtained.

[0092] Specifically, the pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model, wherein the three-dimensional pore pressure model is specifically as follows: Figure 8 As shown;

[0093] The pore pressure dynamic change data are loaded into the three-dimensional fine stress field model of the entire formation section of the three gas storage reservoirs mentioned above ( Figure 2-Figure 4 ), using the seepage-ground stress coupling technology, a simulation study was conducted to obtain simulation results, including a three-dimensional vertical stress dynamic model (such as Figure 9 As shown), three-dimensional minimum horizontal principal stress dynamic model (as shown Figure 10) and the three-dimensional maximum horizontal principal stress dynamic model (as shown in Figure 11 shown);

[0094] Based on the above simulation research results, the dynamic operation data of the gas storage reservoir were obtained, that is, based on the three-dimensional vertical stress dynamic model, the three-dimensional minimum horizontal principal stress dynamic model and the three-dimensional maximum horizontal principal stress dynamic model, the three-dimensional vertical stress dynamic data, the three-dimensional minimum horizontal principal stress dynamic data and the three-dimensional maximum horizontal principal stress dynamic data were obtained respectively.

[0095] In step S3, a cross-sectional dynamic stress model is obtained based on the three-dimensional fine stress field model of the gas storage reservoir and the cross-sectional triangulation method.

[0096] In step S4, the fault stability index is determined based on the gas storage operation dynamic data and the cross-section dynamic stress model, including:

[0097] Determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and cross section dynamic stress model;

[0098] The value of the fault stability index is determined based on the normal stress and shear stress at the end surface.

[0099] Specifically, based on the gas storage operation dynamic data and the cross-section dynamic stress model, the normal stress of the end face is determined according to formula (1):

[0100] σ n = 0.5(σ1 + σ3) + 0.5(σ1 - σ3) cosβ (1)

[0101] In formula (1), σ n is the normal stress, σ1 is the maximum principal stress, σ3 is the minimum principal stress, and β is the angle between the maximum principal stress and the fault plane;

[0102] The shear stress of the end face is determined according to formula (2):

[0103] τ net = 0.5( σ1 - σ3 ) sinβ (2)

[0104] In formula (2), τ net is the shear stress;

[0105] The above-mentioned maximum principal stress σ1, minimum principal stress σ3, and the angle β between the maximum principal stress and the fault plane are all derived from the dynamic data of gas storage operation;

[0106] The fault stability index is determined according to formula (3):

[0107] Tau = τ net ' / μ(σ n -Pp ) (3)

[0108] In formula (3), Tau is the fault stability index, τ net ' is the sum of the shear components of the triaxial principal stresses on the cross section, μ is the cross section sliding friction coefficient, P p is the pore pressure, and μ is derived from the indoor core experimental data;

[0109] In step S4, the dynamic data of the gas storage operation (i.e., the three-dimensional vertical stress dynamic data, the three-dimensional minimum horizontal principal stress dynamic data, and the three-dimensional maximum horizontal principal stress dynamic data) are combined with the cross-section dynamic stress model and the changing trend of the fault stability index under different gas storage operation dynamics is repeatedly calculated according to formulas (1) to (3), as shown in FIG. Figure 12 shown.

[0110] In step S5, the vertical stability evaluation of the end face is completed based on the fault stability index, including:

[0111] The changing trend of the fault stability index under the different gas storage operation dynamics (i.e. Figure 12 The results show that the fault stability index Tau is closer to 1, which means the fault is more prone to shear slip and has a higher risk of instability. When Tau = 1, the corresponding pore pressure is the critical pore pressure, i.e., the maximum gas injection pressure.

[0112] Based on this analysis result, the critical pore pressure value is determined according to the fault stability index Tau and formula (3), including:

[0113] The calculation formula of critical pore pressure obtained by deformation of formula (3) is shown in formula (4);

[0114] P pl = σ n -μ / τ net ' (4)

[0115] In formula (4), P pl is the critical pore pressure;

[0116] According to the magnitude of the critical pore pressure value, the vertical dynamic sealing capacity of the fault is quantitatively characterized, that is, the larger the critical pore pressure value, the greater the vertical dynamic sealing capacity of the fault, thereby completing the vertical stability evaluation of the end face.

[0117] like Figure 13 As shown, a gas storage fault vertical stability evaluation system according to the present invention includes: a three-dimensional model building module 1, an extraction module 2, a cross-section model module 3, an analysis module 4 and an evaluation module 5;

[0118] The three-dimensional model building module 1 is used to build a three-dimensional fine stress field model of the gas storage reservoir;

[0119] The extraction module 2 is used to extract the gas storage reservoir operation dynamic data based on the gas storage reservoir three-dimensional fine stress field model and pore pressure dynamic change data;

[0120] The cross-section model module 3 is used to obtain a cross-section dynamic stress model based on a three-dimensional fine stress field model of the gas storage reservoir and a cross-section triangulation method;

[0121] The analysis module 4 is used to determine the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model;

[0122] The evaluation module 5 is used to complete the end face vertical stability evaluation based on the fault stability index.

[0123] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data.

[0124] In the embodiment of the present invention, the extraction module 2 includes a simulation submodule and an operation dynamic submodule;

[0125] The simulation submodule is used to perform four-dimensional geostress simulation of seepage-geostress coupling based on the three-dimensional fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure;

[0126] The obtained operation dynamics submodule is used to obtain the operation dynamics data of the gas storage reservoir based on four-dimensional ground stress simulation research.

[0127] In an embodiment of the present invention, the three-dimensional fine stress field model of the gas storage reservoir includes the vertical stress of the entire formation segment, the maximum horizontal stress model of the entire formation segment, the minimum horizontal stress model of the entire formation segment, the vertical stress model of the Xinglongtai reservoir segment, the maximum horizontal stress model of the Xinglongtai reservoir segment and the minimum horizontal stress model of the Xinglongtai reservoir segment.

[0128] In an embodiment of the present invention, the pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

[0129] In an embodiment of the present invention, the gas storage operation dynamic data includes three-dimensional vertical stress dynamic data, three-dimensional minimum horizontal principal stress dynamic data, and three-dimensional maximum horizontal principal stress dynamic data.

[0130] In the embodiment of the present invention, the analysis module 4 includes a stress submodule and a fault index submodule;

[0131] The stress submodule is used to determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and the cross section dynamic stress model;

[0132] The fault index submodule is used to determine the fault stability index based on the normal stress and shear stress of the cross section.

[0133] In some embodiments of the present invention, an electronic device is provided, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0134] A memory for storing programs and / or instructions;

[0135] a processor for executing the programs and / or instructions;

[0136] Wherein, when the processor executes the program and / or instruction, it implements the method for evaluating the vertical stability of a gas storage fault as described in the above embodiment.

[0137] In certain embodiments of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for evaluating the vertical stability of a gas storage fault as in the above-mentioned embodiment is provided.

[0138] According to an embodiment of the present invention, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as, but not limited to, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0139] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the vertical stability of a gas storage fault, characterized in that: include: Establish a three-dimensional fine stress field model of the gas storage reservoir; Extract gas storage operation dynamic data based on the gas storage 3D fine stress field model and pore pressure dynamic change data; Based on the three-dimensional fine stress field model of the gas storage reservoir and the cross-section triangulation method, the cross-section dynamic stress model is obtained; Determine the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model; Based on the fault stability index, the vertical stability evaluation of the section is completed; Determining the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model includes: Determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and cross section dynamic stress model; Determine the value of the fault stability index based on the normal stress and shear stress of the cross section; Tau= τ net ' / µ (s) n -P p ) Where, Tau is the fault stability index, τ net ' is the sum of the shear components of the triaxial principal stresses on the cross section, µ is the cross section sliding friction coefficient, P p is the pore pressure, σ n is the normal stress; The vertical stability evaluation of the end face is completed based on the fault stability index, including: According to the fault stability index, the critical pore pressure is obtained; According to the critical pore pressure, the vertical stability evaluation of the section is completed; The extraction of gas storage operation dynamic data based on the gas storage three-dimensional fine stress field model and pore pressure change data includes: Based on the 3D fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure, a 4D geostress simulation study of seepage-geostress coupling was conducted; Based on four-dimensional ground stress simulation research, dynamic data of gas storage operation is obtained.

2. The method for evaluating the vertical stability of a gas storage fault according to claim 1, characterized in that: The three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data.

3. The method for evaluating the vertical stability of a gas storage fault according to claim 1, characterized in that: The three-dimensional fine stress field model of the gas storage reservoir includes the vertical stress of the entire formation segment, the maximum horizontal stress model of the entire formation segment, the minimum horizontal stress model of the entire formation segment, the vertical stress model of the Xinglongtai reservoir segment, the maximum horizontal stress model of the Xinglongtai reservoir segment and the minimum horizontal stress model of the Xinglongtai reservoir segment.

4. The method for evaluating the vertical stability of a gas storage fault according to claim 1, wherein: The pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

5. The method for evaluating the vertical stability of a gas storage fault according to claim 1, characterized in that: The gas storage operation dynamic data includes three-dimensional Young's modulus dynamic data, three-dimensional minimum horizontal principal stress dynamic data and three-dimensional maximum horizontal principal stress dynamic data.

6. The method for evaluating the vertical stability of a gas storage fault according to claim 1, characterized in that: The normal stress is determined according to the following formula: s n = 0.5(σ1 + σ3 ) + 0.5( σ1 - σ3 ) cosβ, Among them, σ n is the normal stress, σ1 is the maximum principal stress, σ3 is the minimum principal stress, and β is the angle between the maximum principal stress and the fault plane.

7. The method for evaluating the vertical stability of a gas storage fault according to claim 6, characterized in that: The shear stress is determined according to the following formula: t net = 0.5(σ1 - σ3 ) sinβ, Among them, τ net is the shear stress.

8. A system for evaluating the vertical stability of gas storage faults, characterized in that: include: 3D model building module, extraction module, cross-section model module, analysis module and evaluation module; The three-dimensional model building module is used to build a three-dimensional fine stress field model of the gas storage reservoir; The extraction module is used to extract the gas storage reservoir operation dynamic data based on the gas storage reservoir three-dimensional fine stress field model and pore pressure dynamic change data; The cross-section model module is used to obtain a cross-section dynamic stress model based on a three-dimensional fine stress field model of the gas storage reservoir and a cross-section triangulation method; The analysis module is used to determine the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model; The evaluation module is used to complete the vertical stability evaluation of the section based on the fault stability index; Determining the fault stability index based on the gas storage operation dynamic data and the cross-section dynamic stress model includes: Determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and cross section dynamic stress model; Determine the value of the fault stability index based on the normal stress and shear stress of the cross section; Tau= τ net ' / µ (s) n -P p ) Where, Tau is the fault stability index, τ net ' is the sum of the shear components of the triaxial principal stresses on the cross section, µ is the cross section sliding friction coefficient, P p is the pore pressure, σ n is the normal stress; The vertical stability evaluation of the end face is completed based on the fault stability index, including: According to the fault stability index, the critical pore pressure is obtained; According to the critical pore pressure, the vertical stability evaluation of the end face is completed; The extraction of gas storage operation dynamic data based on the gas storage three-dimensional fine stress field model and pore pressure change data includes: Based on the 3D fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure, a 4D geostress simulation study of seepage-geostress coupling was conducted; Based on four-dimensional ground stress simulation research, dynamic data of gas storage operation is obtained.

9. The system for evaluating vertical stability of gas storage faults according to claim 8, characterized in that: The three-dimensional fine stress field model of the gas storage reservoir is established based on well logging, testing, core data, seismic interpretation results, and geological analysis data.

10. The system for evaluating vertical stability of gas storage faults according to claim 8, characterized in that: The three-dimensional fine stress field model of the gas storage reservoir includes the vertical stress of the entire formation segment, the maximum horizontal stress model of the entire formation segment, the minimum horizontal stress model of the entire formation segment, the vertical stress model of the Xinglongtai reservoir segment, the maximum horizontal stress model of the Xinglongtai reservoir segment and the minimum horizontal stress model of the Xinglongtai reservoir segment.

11. The system for evaluating vertical stability of gas storage faults according to claim 8, characterized in that: The pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

12. The system for evaluating vertical stability of gas storage faults according to claim 8, characterized in that: The gas storage operation dynamic data includes three-dimensional vertical stress dynamic data, three-dimensional minimum horizontal principal stress dynamic data and three-dimensional maximum horizontal principal stress dynamic data.

13. The system for evaluating vertical stability of gas storage faults according to claim 8, characterized in that: The analysis module includes a stress submodule and a fault index submodule; The stress submodule is used to determine the normal stress and shear stress of the cross section based on the gas storage operation dynamic data and the cross section dynamic stress model; The fault index submodule is used to determine the fault stability index based on the normal stress and shear stress of the cross section.

14. An electronic device, characterized in that: include: A processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; A memory for storing programs and / or instructions; a processor for executing the programs and / or instructions; Wherein, when executing the program and / or instruction, the processor implements the method for evaluating the vertical stability of a gas storage fault as described in any one of claims 1 to 7.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the vertical stability of a gas storage fault according to any one of claims 1 to 7 is implemented.

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