Method and system for evaluating vertical stability of fault of gas storage

Abstract

The invention relates to a gas storage fault vertical stability evaluation method and system, and belongs to the technical field of underground gas storage construction safety. The evaluation method comprises the following steps: establishing a three-dimensional fine stress field model of the gas storage; based on the gas storage three-dimensional fine stress field model and the pore pressure dynamic change data, extracting gas storage operation dynamic data; based on the gas storage three-dimensional fine stress field model and a section triangular mesh generation method, a section dynamic stress model is obtained; determining a fault stability index based on the gas storage operation dynamic data and the section dynamic stress model; and completing end face vertical stability evaluation based on the fault stability index. According to the method disclosed by the invention, the relationship characterization between the gas storage operation dynamic state and the pore pressure is realized through the fault index, so that the critical pore pressure under the gas storage operation dynamic state is determined, and the sealing vertical dynamic sealing capability on the fault through the critical pore pressure is realized; the problem that the gas storage fault injection-production dynamic sealing performance cannot be quantitatively represented in the prior art is solved.

Description

Technical Field

[0001] The 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 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. The pressure increase achieved through quantitative sealing evaluation is also the most direct and effective way to improve the operating efficiency of the gas reservoir. However, under high-speed and high-intensity injection and production and alternating load conditions, gas reservoirs are at high risk of vertical leakage, combustion, explosion, and other hazards caused by fault instability. The main reason for these risks is the rapid change of formation pressure during injection and production and the resulting changes in the underground stress field in the reservoir area. It is urgent to quantitatively evaluate the vertical stability of faults to guide the dynamic evaluation 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 define the pressure limit of the fault. Therefore, most of them 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, and the geological conditions and stress fields have undergone tremendous changes compared with the initial development. The sealing of caprocks and faults has 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 of faults during the injection and production process of gas storage, it is necessary to carry out the dynamic sealing evaluation of faults during injection and production, and study a method that fully and comprehensively considers the geological characteristics and the changes in pressure and stress 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 view of the above problems, the present invention solves the problem that it was impossible 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 are created, and then 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 by the following technical solutions:

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

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

[0009] Extract the 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 triangular mesh generation 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 the 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 and obtained based on a three-dimensional pore pressure model.

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

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

[0018] Based on four-dimensional geostress simulation research, the dynamic operation data of the gas storage reservoir 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 the embodiment of the present invention, the method of 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 the 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(σ 1 +σ 3 )+0.5(σ 1 -σ 3 )cosβ,

[0025] Among them, σ n is the normal stress, σ 1 is the maximum principal stress, σ 3 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(σ 1 -σ 3 )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 the 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] According to 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 by 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 the 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 a gas storage reservoir and a cross-section triangular mesh generation 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 the 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 the embodiment of the present invention, the extraction module includes a simulation submodule and an operation dynamic submodule;

[0044] The simulation submodule is used to conduct four-dimensional geostress simulation research 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 and obtained 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 reservoir 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, 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;

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

[0055] A processor, configured to execute the program and / or instructions;

[0056] Wherein, when the processor executes the program and / or instruction, it 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 having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-mentioned method for evaluating the vertical stability of a gas storage reservoir 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., the comprehensive characterization of the geological characteristics and the pressure and stress changes in the storage area under the injection-production alternating load conditions) and the 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, thereby 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. The geological characteristics and the dynamic stress changes of injection-production are comprehensively considered to realize the quantitative evaluation of the vertical sealing capacity of the fault of the oilfield gas storage reservoir, improve the evaluation accuracy, determine the dynamic sealing pressure limit of the fault, and provide a scientific basis for the pressure increase and capacity increase 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, and the working gas volume of the gas storage group is increased, which fundamentally guarantees the efficient and safe operation of the Shuangtaizi gas storage group, and realizes the leap from static to dynamic, qualitative to quantitative, and single to diversified evaluation of the fault sealing evaluation.

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

[0062] The invention provides a quantitative evaluation method for the vertical stability of a gas storage fault, which is of great significance for quantitatively evaluating the sealing performance of a gas storage group, 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 partly become apparent from the description, or 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 briefly introduces 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 creative work.

[0065] Figure 1 A flow chart of a method for evaluating 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 the 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 the 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 the 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 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 the 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 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] Fig. 9 A three-dimensional vertical stress dynamic model according to an embodiment of the present invention is shown;

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

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

[0076] Fig.12 A distribution diagram of fault stability parameters under dynamic data of gas storage operation according to an embodiment of the present invention is shown;

[0077] Fig.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] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0080] like Figure 1 The 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 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;

[0083] Step S3, obtaining 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;

[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 are specifically cuttings logging, mud density, well logging data (including density, acoustic wave, gamma, resistance, well diameter, etc.), pressure test, formation fracture test, and seismic structure interpretation results;

[0087] In the specific operation, during the construction of the three-dimensional fine stress field model of the gas storage reservoir, the three-iteration cycle geological and mechanical modeling technology was upgraded to infinitely restore the real underground situation, and a new single well + three-dimensional co-simulation method was newly established to integrate density, layer velocity and elastic parameters, thereby completing the construction of the three-dimensional fine stress field model of the gas storage reservoir and realizing 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 shown in the figure) Figure 3 As shown in the figure), the minimum horizontal stress model for the entire formation segment (as shown in the figure) Figure 4 The vertical stress model of the Xinglongtai reservoir section (as shown in Figure 5 The maximum horizontal stress model of the Xinglongtai reservoir section (as shown in Figure 6 ) and the minimum horizontal stress model of the Xinglongtai reservoir section (as shown in Figure 7 shown).

[0089] In step S2, the gas storage reservoir operation dynamic data is extracted based on the three-dimensional fine stress field model of the gas storage reservoir and the pore pressure dynamic change data, including:

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

[0091] Based on four-dimensional geostress simulation research, the dynamic operation data of the gas storage reservoir 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-earth stress coupling technology, a simulation study is conducted to obtain simulation study results, including a three-dimensional vertical stress dynamic model (such as Fig. 9 As shown in), three-dimensional minimum horizontal principal stress dynamic model (as shown in Fig.10) and the three-dimensional maximum horizontal principal stress dynamic model (as shown in Fig.11 shown);

[0094] Based on the above simulation research results, the dynamic data of gas storage operation are 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 are obtained respectively.

[0095] In step S3, a cross-section dynamic stress model is obtained based on the three-dimensional fine stress field model of the gas storage reservoir and the cross-section 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 the 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, according to 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(σ 1 + σ 3 ) + 0.5(σ 1 - σ 3 ) cosβ (1)

[0101] In formula (1), σ n is the normal stress, σ 1 is the maximum principal stress, σ 3 is the minimum principal stress, 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(σ 1 - σ 3 ) sinβ (2)

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

[0105] The maximum principal stress σ 1 , minimum principal stress σ 3, the angle β between the maximum principal stress and the fault plane is 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 -P p ) (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, under the gas storage operation dynamic data (i.e., three-dimensional vertical stress dynamic data, three-dimensional minimum horizontal principal stress dynamic data, and three-dimensional maximum horizontal principal stress dynamic data), combined with the cross-section dynamic stress model, the change trend of the fault stability index under different gas storage operation dynamics is repeatedly calculated according to formulas (1)-(3), such as Fig.12 shown.

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

[0111] The variation trend of the fault stability index under the different gas storage operation dynamics (i.e. Fig.12 The data in the above table are analyzed and it is found that the value of the fault stability index Tau is closer to 1, which means that the fault is more likely to shear slip and the risk of instability is higher. When Tau=1, the corresponding pore pressure is the critical pore pressure, that is, 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 the 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 Fig.13 As shown, a gas storage fault vertical stability evaluation system according to the present invention comprises: 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 the 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 triangular mesh generation 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 vertical stability evaluation of the end face based on the fault stability index.

[0123] In the 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 conduct four-dimensional geostress simulation research 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 and obtained 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 reservoir 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, the electronic device 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, configured to execute the program and / or instructions;

[0136] Wherein, when the processor executes the program and / or instruction, it implements the method for evaluating the vertical stability of the 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 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 computer-readable storage medium, for example, may include but is 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 may be used by or in combination 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 substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions 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 the 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 triangular mesh generation 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 end face is completed.

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 vertical stress of the entire formation segment, maximum horizontal stress model of the entire formation segment, minimum horizontal stress model of the entire formation segment, vertical stress model of the Xinglongtai reservoir segment, maximum horizontal stress model of the Xinglongtai reservoir segment and 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, characterized in that: 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 reservoir operation dynamic data is extracted based on the three-dimensional fine stress field model of the gas storage reservoir and the pore pressure change data, including: Based on the three-dimensional fine stress field model of the gas storage reservoir and the dynamic change data of pore pressure, a four-dimensional geostress simulation study of seepage-geostress coupling was conducted; Based on four-dimensional geostress simulation research, the dynamic operation data of the gas storage reservoir is obtained.

6. 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.

7. The method for evaluating the vertical stability of a gas storage fault according to claim 1, characterized in that: 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 the cross section dynamic stress model; The value of the fault stability index is determined based on the normal stress and shear stress of the cross section.

8. The method for evaluating the vertical stability of a gas storage fault according to claim 7, 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.

9. The method for evaluating the vertical stability of a gas storage fault according to claim 8, 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.

10. The method for evaluating the vertical stability of a gas storage fault according to claim 9, characterized in that: The fault stability index is determined according to the following formula: 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.

11. The method for evaluating the vertical stability of a gas storage fault according to claim 7, characterized in that: 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 magnitude of the critical pore pressure, the vertical stability evaluation of the end face is completed.

12. A gas storage reservoir fault vertical stability evaluation system, 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 the 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 a gas storage reservoir and a cross-section triangular mesh generation 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 end face based on the fault stability index.

13. A gas storage fault vertical stability evaluation system according to claim 12, 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.

14. A gas storage fault vertical stability evaluation system according to claim 12, characterized in that: The extraction module includes a simulation submodule and an operation dynamic submodule; The simulation submodule is used to conduct four-dimensional geostress simulation research 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; 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.

15. A gas storage fault vertical stability evaluation system according to claim 12, characterized in that: The three-dimensional fine stress field model of the gas storage reservoir includes vertical stress of the entire formation segment, maximum horizontal stress model of the entire formation segment, minimum horizontal stress model of the entire formation segment, vertical stress model of the Xinglongtai reservoir segment, maximum horizontal stress model of the Xinglongtai reservoir segment and minimum horizontal stress model of the Xinglongtai reservoir segment.

16. A gas storage fault vertical stability evaluation system according to claim 12, characterized in that: The pore pressure dynamic change data is extracted based on a three-dimensional pore pressure model.

17. A gas storage fault vertical stability evaluation system according to claim 12, 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.

18. A gas storage fault vertical stability evaluation system according to claim 12, 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 reservoir 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.

19. 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, configured to execute the program 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 11.

20. 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 11 is implemented.

Images