Quantitative evaluation method and system for lateral sealing capacity of fault of gas storage

Abstract

The invention relates to a quantitative evaluation method and system for the lateral sealing capacity of a gas storage fault, and belongs to the technical field of underground gas storage evaluation. The quantitative evaluation method comprises the following steps: determining fault rock sealing of a sand-sand butt joint type; on the basis of fault rock sealing of a sand-sand butt joint type, a function relation expression of a gas storage group sealing outer envelope line is constructed; determining a closed fault mud ratio critical value based on the function relation of the closed outer envelope of the gas storage group; and based on the function relation of the closed outer envelope of the gas storage group and the closed fault mud ratio critical value, completing quantitative evaluation of the lateral closing capacity of the fault. According to the method, the upper limit pressure of the gas storage can be determined, the defect of qualitative evaluation only considering mud rock smearing properties in the past is overcome, geological and development characteristics are integrated, quantitative evaluation of the sealing performance of the oil field gas storage is achieved, the evaluation precision is improved, the upper limit operation pressure of safe operation of the gas storage is determined, and safe and efficient operation of the gas storage is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of underground gas storage evaluation, and in particular relates to a quantitative evaluation method and system for the lateral sealing capacity of a gas storage fault. Background Art

[0002] The technology for determining the upper limit pressure of gas storage is crucial in the construction of gas storage. It is the primary indicator for the site selection and evaluation of gas storage, an important basis for increasing pressure and capacity, and a key factor for safe operation. The study of the upper limit pressure of gas storage is imperative. Increasing the pressure of gas storage by determining the upper limit pressure is also the most direct and effective way to improve the operating efficiency of gas storage. Domestic and foreign gas storages usually use the qualitative sealing evaluation method of mudstone smear coefficient, and use the ratio of mudstone depth (h) and fault distance (T) as the safety factor. The evaluation results are as follows: Figure 1 As shown in the figure, the safety factor (SSF) is less than 4, and the fault closure is qualitatively judged. It can be seen that the above method is only a qualitative evaluation of the fault closure performance, and it is impossible to clearly define the fault's pressure limit. Therefore, most domestic and foreign methods use the original formation pressure as the upper limit pressure, and the pressure increase depends on experience. The results are as follows Figure 2 As shown, from Figure 2 It can be seen from the above that the empirical pressure increase is just a simple data simulation of the unpressurized data, and cannot take into account factors such as the change in the smear properties of mudstone. At present, there is no relevant technical means for quantitative evaluation of the upper limit pressure and the scientific basis for pressure increase. Summary of the invention

[0003] In view of the above problems, the present invention solves the shortcomings of previous qualitative evaluation that only considers the properties of mudstone smearing. By creating a quantitative evaluation method and system for the lateral sealing capacity of the fault, the lateral sealing pressure limit of the fault is quantified, providing a scientific basis for determining the upper limit pressure of safe operation of the gas storage reservoir and realizing pressure-elevated operation.

[0004] The first object of the present invention is to provide a quantitative evaluation method for the lateral sealing capacity of a gas storage fault, the quantitative evaluation method comprising:

[0005] Determine the fault rock closure of sand-sand butt joint type;

[0006] Based on the fault rock seal of sand-sand butt joint type, the functional relationship of the outer envelope of the gas storage group seal is constructed;

[0007] Based on the functional relationship of the closed outer envelope of the gas storage group, the critical value of the closed fault mud ratio is determined;

[0008] Based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

[0009] In an embodiment of the present invention, the sand-sand joint type fault rock closure is determined by a lithology triangle plate.

[0010] In an embodiment of the present invention, the lithology triangle map is established based on well data, layering and shale content parameters.

[0011] In an embodiment of the present invention, the functional relationship of constructing the outer envelope of the gas storage group closure based on the sand-sand butt joint type fault rock closure includes:

[0012] Based on the fault rock seal of sand-sand butt joint type and the fault mud ratio attribute model containing mud, the relationship between fault pressure difference and fault mud ratio is determined;

[0013] Based on the relationship between fault pressure difference and fault mud ratio, the functional relationship of the closed outer envelope of the gas storage group is fitted.

[0014] In an embodiment of the present invention, the fault rock sealing and mud-containing fault mud ratio attribute model based on the sand-sand joint type determines the relationship between the fault pressure difference and the fault mud ratio, including:

[0015] Based on the fault rock closure and trap dissection method of sand-sand butt joint type, the first fault parameter is obtained;

[0016] Based on the first parameter of the fault, the relationship between the fault pressure difference and depth in the gas storage reservoir is calculated;

[0017] Based on the mud content in the well log and the mud ratio attribute model containing mud, the relationship between the mud ratio and depth is determined;

[0018] Based on the relationship between the fault pressure difference and the depth and the relationship between the fault mud ratio and the depth, the relationship between the fault pressure difference and the fault mud ratio is determined.

[0019] In an embodiment of the present invention, the first parameters include fluid type, fluid density, hydrocarbon column height, trapped oil and gas height, oil-water interface height, trap closure height and overflow point position of the fluid on both sides of the fault.

[0020] In an embodiment of the present invention, the quantitative evaluation of the lateral sealing capacity of the fault is completed based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, including:

[0021] Based on the functional relationship of the closed outer envelope of the gas storage group, a breakthrough pressure model is established;

[0022] Based on the breakthrough pressure model and the critical value of the sealing fault mud ratio, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

[0023] In an embodiment of the present invention, the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the critical value of the sealing fault mud ratio is completed, including:

[0024] Based on the constraint of the critical value of the ratio of the closed fault mud, the location of the weak point of the fault is determined;

[0025] Based on the breakthrough pressure model and the location of the fault's weak points, a quantitative evaluation of the fault's lateral sealing capacity is completed.

[0026] In an embodiment of the present invention, based on the breakthrough pressure model and the location of the weak point of the fault, a quantitative evaluation of the lateral sealing capacity of the fault is completed, including:

[0027] Based on the breakthrough pressure model and the location of the fault weak point, determine the maximum pressure that the fault weak point can withstand;

[0028] Based on the maximum pressure that the weak point of the fault can withstand, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

[0029] The second object of the present invention is to provide a quantitative evaluation system for the lateral sealing capacity of a gas storage fault, the quantitative evaluation system comprising: a determination module, a function relationship establishment module, a critical value module and an analysis module;

[0030] The determination module is used to determine the fault rock closure of the sand-sand butt joint type;

[0031] The functional relationship building module is used to construct a functional relationship of the closed outer envelope of the gas storage group based on the fault rock closure of the sand-sand butt joint type;

[0032] The critical value module is used to determine the critical value of the closed fault mud ratio based on the functional relationship of the closed outer envelope of the gas storage group;

[0033] The analysis module is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio.

[0034] In an embodiment of the present invention, the sand-sand joint type fault rock closure is determined by a lithology triangle plate.

[0035] In an embodiment of the present invention, the lithology triangle map is established based on well data, layering and shale content parameters.

[0036] In an embodiment of the present invention, the functional relationship establishment module includes a first level submodule and a second level submodule;

[0037] The first level submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the fault rock sealing of the sand-sand butt joint type and the fault mud ratio attribute model containing mud;

[0038] The second level submodule is used to fit the functional relationship of the closed outer envelope of the gas storage group based on the relationship between the fault pressure difference and the fault mud ratio.

[0039] In an embodiment of the present invention, the first level-one submodule includes a first level-two submodule, a second level-two submodule, a third level-two submodule and a fourth level-two submodule;

[0040] The first secondary submodule is used to obtain the first fault parameter based on the fault rock closure and trap dissection method of the sand-sand docking type;

[0041] The second secondary submodule is used to calculate the relationship between the fault pressure difference and the depth in the gas storage reservoir based on the first fault parameter;

[0042] The third secondary submodule is used to determine the relationship between the fault gouge ratio and the depth based on the mud content in the well logging and the attribute model of the fault gouge ratio containing mud;

[0043] The fourth secondary submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the relationship between the fault pressure difference and the depth and the relationship between the fault mud ratio and the depth.

[0044] In an embodiment of the present invention, the first parameters include fluid type, fluid density, hydrocarbon column height, trapped oil and gas height, oil-water interface height, trap closure height and overflow point position of the fluid on both sides of the fault.

[0045] In an embodiment of the present invention, the analysis module includes a third primary submodule and a fourth primary submodule;

[0046] The third primary submodule is used to establish a breakthrough pressure model based on the functional relationship of the closed outer envelope of the gas storage group;

[0047] The fourth first-level submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the critical value of the sealing fault mud ratio.

[0048] In an embodiment of the present invention, the fourth primary submodule includes a fifth secondary submodule and a sixth secondary submodule;

[0049] The fifth secondary submodule is used to determine the position of the fault weak point based on the constraint of the critical value of the closed fault mud ratio;

[0050] The sixth secondary submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the location of the weak point of the fault.

[0051] In an embodiment of the present invention, the six level-2 submodules include a first level-3 submodule and a second level-3 submodule;

[0052] The first three-level submodule is used to determine the maximum pressure that the fault weak point can withstand based on the breakthrough pressure model and the location of the fault weak point;

[0053] The second and third level submodules are used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the maximum pressure that the weak point of the fault can withstand.

[0054] The third object of the present invention is to provide an electronic device, 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;

[0055] A memory for storing programs and / or instructions;

[0056] A processor, configured to execute the program and / or instructions;

[0057] Wherein, when executing the program and / or instruction, the processor implements the quantitative evaluation method of the lateral sealing capacity of the gas storage fault as described above.

[0058] The fourth object of the present invention is to provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-mentioned quantitative evaluation method for the lateral sealing capacity of a gas storage reservoir fault.

[0059] Beneficial effects of the present invention:

[0060] The present invention provides a quantitative evaluation method and system for the lateral sealing capacity of a gas storage reservoir. The method can determine the upper limit pressure of the gas storage reservoir, solves the shortcomings of previous qualitative evaluation that only considers the properties of mudstone smear, comprehensively considers geological and development characteristics, realizes quantitative evaluation of the sealing performance of oilfield gas storage reservoirs, improves evaluation accuracy, determines the upper limit operating pressure of the safe operation of the gas storage reservoir, ensures the safe and efficient operation of the gas storage reservoir, provides a scientific basis for the pressure increase and capacity expansion of the gas storage reservoir, and at the same time, improves the upper limit operating pressure of each gas reservoir in the gas storage group, increases the working gas volume of the gas storage group, and ensures the efficient and safe operation of the gas storage group.

[0061] The quantitative evaluation method and system for the lateral sealing capacity of a fault of a gas storage reservoir of the present invention are suitable for quantitative evaluation research on the determination of the upper limit pressure during the construction and operation of the gas storage reservoir.

[0062] The quantitative evaluation method and system of the fault lateral sealing capacity of a gas storage reservoir of the present invention are of great significance for quantitatively evaluating the sealing performance of a gas storage reservoir group, guiding the construction of gas storage reservoirs, and ensuring the efficient operation of gas storage reservoirs.

[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 The result diagram of qualitative sealing evaluation such as mudstone smear coefficient in the prior art is shown;

[0066] Figure 2 The result diagram of the sealing evaluation of the prior art in which the pressure is raised by relying on experience is shown;

[0067] Figure 3 A flow chart showing a method for quantitatively evaluating the lateral sealing capacity of a gas storage fault according to an embodiment of the present invention is shown;

[0068] Figure 4 A triangular diagram of 28 faults of the S gas storage group according to an embodiment of the present invention is shown;

[0069] Figure 5 The fault rock sealing types determined by the triangular map of 28 faults in the S gas storage group according to an embodiment of the present invention are shown;

[0070] Figure 6 A diagram showing the relationship between the fault pressure difference and the fault mud ratio of 28 faults in the S gas storage group according to an embodiment of the present invention is shown;

[0071] Figure 7 The breakthrough pressure distribution diagram of 28 faults of the S gas storage group according to an embodiment of the present invention is shown;

[0072] Figure 8 A framework diagram of a quantitative evaluation system for lateral sealing capability of a gas storage fault according to an embodiment of the present invention is shown;

[0073] In the figure:

[0074] 1. Determination module; 2. Function relationship establishment module; 3. Critical value module; 4. Analysis module. DETAILED DESCRIPTION

[0075] 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.

[0076] like Figure 3 As shown, a quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to this embodiment includes:

[0077] Step S1, determining the fault rock closure of the sand-sand joint type;

[0078] Step S2, constructing a functional relationship of the closed outer envelope of the gas storage group based on the sand-sand joint type fault rock closure;

[0079] Step S3, determining a critical value of the closed fault mud ratio based on a functional relationship of the closed outer envelope of the gas storage group;

[0080] Step S4: Based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

[0081] In step S1, the fault rock closure of the sand-sand butt joint type is determined by a lithology triangle map to clarify the lithology butt joint relationship between the two fault plates at different fault throws and depths (i.e., clarify the fault rock closure of the sand-sand butt joint type at different fault throws and depths);

[0082] In practice, there are two different fault sealing types in the sandstone gas storage faults, one is the lithologic butt sealing of sand-mud butt and mud-mud butt, and the other is the fault rock sealing of sand-sand butt. In step S1 of the present invention, the lithologic butt relationship at different fault throws and depths is determined according to the lithologic triangle map, and the fault rock sealing type of sand-sand butt is determined, wherein the lithologic triangle map is established based on the well data, stratification and mud content parameters;

[0083] Specifically, the quantitative evaluation of the lateral sealing capacity of 28 faults in a certain S gas storage group is taken. In step S1, a lithology triangle map is established based on the well data, stratification and shale content parameters, such as Figure 4 As shown, the fault rock closure of the sand-sand joint type in 28 faults was determined. Figure 5 As shown in the figure, sand-sand joint is fault rock closure, sand-mud joint and mud-mud joint are joint closure;

[0084] In step S2, the sand-sand joint type fault rock seal constructs a functional relationship of the closed outer envelope of the gas storage group, including:

[0085] Based on the fault rock seal of sand-sand butt joint type and the fault mud ratio attribute model containing mud, the relationship between fault pressure difference and fault mud ratio is determined;

[0086] Based on the relationship between fault pressure difference and fault mud ratio, the functional relationship of the closed outer envelope of the gas storage group is fitted.

[0087] Specifically, the fault rock sealing and mud-containing fault mud ratio attribute model based on the sand-sand joint type determines the relationship between the fault pressure difference and the fault mud ratio, including:

[0088] Based on the fault rock closure of the sand-sand butt joint type and the trap dissection method, the first fault parameter is obtained, that is, for the fault rock closure of the sand-sand butt joint type, the first fault parameter is obtained by using the trap dissection method, and the first fault parameter includes the fluid type, fluid density, hydrocarbon column height, trap oil and gas height, oil-water interface height, trap closure height and overflow point position of the fluid on both sides of the fault;

[0089] Based on the above-mentioned first fault parameter, the fault pressure difference is calculated according to the pressure difference formula on both sides of the fault, and then the relationship between the pressure difference and depth of the 28 faults in the S gas storage reservoir is obtained;

[0090] Based on the attribute model of the mud content in the well logging and the mud ratio of the mud-containing fault (hereinafter referred to as SGR), the relationship between the mud ratio and the depth is determined, that is, the mud content in the well logging is assigned to the SGR attribute model containing mud, and then the relationship between the mud ratio and the depth is determined;

[0091] Based on the relationship between fault pressure difference and depth and the relationship between fault mud ratio and depth, the relationship between fault pressure difference and fault mud ratio is determined, that is, the relationship chart between fault pressure difference and fault mud ratio in fault rock closure with sand-sand butt joint types in different faults is obtained, such as Figure 6 As shown;

[0092] Specifically, the functional relationship of the closed outer envelope of the gas storage group is fitted based on the relationship between the fault pressure difference and the fault mud ratio, that is, based on the relationship chart between the fault pressure difference and the fault mud ratio, the closed outer envelope of the gas storage group is fitted using a statistical method ( Figure 6 The curve in ( ), and at the same time obtain the functional relationship of the outer envelope, as shown in formula (1),

[0093] AFPD=0.278ln(SGR)-0.857 (1)

[0094] In formula (1), AFPD is the fault pressure difference and SGR is the fault mud ratio.

[0095] In step S3, the critical value of the closed fault mud ratio is determined based on the functional relationship of the closed outer envelope of the gas storage group.

[0096] Specifically, the critical value of the fault mud ratio for lateral closure of the fault is determined based on the relationship between the fault pressure difference and the fault mud ratio, that is, from the relationship chart of the fault pressure difference and the fault mud ratio (i.e. Figure 6 ) The critical value of the closed fault mud ratio (SGR) is 19.7%. The present invention is only an example of the critical value of the closed fault mud ratio obtained by evaluating the 28 faults of the S gas storage in the above manner. In actual problems, the critical value of the closed fault mud ratio will be different due to different specific conditions of the gas storage;

[0097] In step S4, the quantitative evaluation of the lateral sealing capacity of the fault is completed based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, including:

[0098] Based on the functional relationship of the closed outer envelope of the gas storage group, a breakthrough pressure model is established, that is, the breakthrough pressure model is established with formula (1) as a constraint;

[0099] Based on the constraint of the critical value of the closed fault mud ratio, the position of the fault weak point is determined, that is, the critical value of the closed fault SGR is 19.7% as a constraint, that is, the value is given a special color in the SGR attribute model (this value is also called the color bar representative value), at this time, the point on the plate of the SGR attribute model that is less than or equal to the critical value of the closed fault SGR (the point on the plate that is less than or equal to the depth of the color bar representing the critical point color) is the fault weak point (that is, the first weak point of the fault to break through), that is, the position of the fault weak point is determined, and the lateral fluid fluid type, fluid density, and hydrocarbon column height parameter values ​​corresponding to the position of the fault weak point are obtained;

[0100] Based on the position of the fault weak point and the breakthrough pressure model, the maximum pressure that the fault weak point can withstand is determined, that is, the lateral fluid type, fluid density, and hydrocarbon column height parameter values ​​at the position of the fault weak point are substituted into the calculation formula of the breakthrough pressure (2), and the calculation result is the maximum pressure that the fault weak point can withstand;

[0101] F t =AFPD+ρgh (2)

[0102] In formula (2), F t is the breakthrough pressure, AFPD is the fault pressure difference, ρ is the fluid density, g is the gravitational acceleration, h is the depth, and the AFPD data is derived from the breakthrough pressure model;

[0103] Based on the maximum pressure that the weak point of the fault can withstand, complete the quantitative evaluation of the lateral sealing capacity of the fault, including:

[0104] According to formula (2), the maximum pressure (fault breakthrough pressure) that the 28 fault weak points of the S gas storage group can withstand is determined, and the fault breakthrough pressure distribution of the 28 fault weak points of the S gas storage group can be obtained as follows: Figure 7 As shown;

[0105] In summary, the data on the closure type, weak point location, fault breakthrough pressure and original bottom pressure of 14 faults out of the 28 faults in the S gas storage group are compiled into a table, as shown in Table 1, where sand-sand butt joint is fault rock closure, and sand-mud butt joint and mud-mud butt joint are butt joint closure.

[0106] Table 1

[0107]

[0108] Based on the data in Table 1, according to the breakthrough pressure of F1 fault of S6 of 26.26 MPa, it is estimated that when the upper limit pressure of S6 gas storage in S gas storage is increased from 24 MPa to 26 MPa, the working gas volume will increase by 3.2×108m 3 At present, the S6 gas storage has successfully increased the pressure by 1.3MPa and increased the capacity by 2.3×108m by applying the above evaluation method. 3 .

[0109] At the same time, through the evaluation method, it is believed that the middle faults F2 and F3 of the S6 gas storage reservoir are not closed, the weak point of the edge F1 fault is 2545m deep and withstands a pressure of 26MPa, which dynamically confirms the fault closure. The equilibrium period is relatively stable with small fluctuations, indicating that the boundary F1 fault has good closure. When gas was injected into the S1 block in the S6 gas storage reservoir at the beginning and the S2 block was not injected, the formation pressure of the S2 block began to recover, indicating that the middle F2 and F3 faults are not closed, which is consistent with the prediction, proving the reliability of this sealing prediction.

[0110] like Figure 8 As shown, in certain embodiments of the present invention, a quantitative evaluation system for the lateral sealing capacity of a gas storage fault is provided, the quantitative evaluation system comprising: a determination module 1, a function relationship establishment module 2, a critical value module 3 and an analysis module 4;

[0111] The determination module 1 is used to determine the fault rock closure of the sand-sand butt joint type;

[0112] The functional relationship building module 2 is used to construct a functional relationship of the closed outer envelope of the gas storage group based on the fault rock closure of the sand-sand butt joint type;

[0113] The critical value module 3 is used to determine the critical value of the closed fault mud ratio based on the functional relationship of the closed outer envelope of the gas storage group;

[0114] The analysis module 4 is used to perform quantitative evaluation of the lateral sealing capacity of the fault based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio.

[0115] In an embodiment of the present invention, the sand-sand joint type fault rock closure is determined by a lithology triangle plate.

[0116] In an embodiment of the present invention, the lithology triangle map is established based on well data, layering and mud content parameters.

[0117] In the embodiment of the present invention, the functional relationship establishment module includes a first level submodule and a second level submodule;

[0118] The first level submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the fault rock sealing of the sand-sand butt joint type and the fault mud ratio attribute model containing mud;

[0119] The second level submodule is used to fit the functional relationship of the closed outer envelope of the gas storage group based on the relationship between the fault pressure difference and the fault mud ratio.

[0120] In the embodiment of the present invention, the first level-one submodule includes a first level-two submodule, a second level-two submodule, a third level-two submodule and a fourth level-two submodule;

[0121] The first secondary submodule is used to obtain the first fault parameter based on the fault rock closure and trap dissection method of the sand-sand docking type;

[0122] The second secondary submodule is used to calculate the relationship between the fault pressure difference and the depth in the gas storage reservoir based on the first fault parameter;

[0123] The third secondary submodule is used to determine the relationship between the fault gouge ratio and the depth based on the mud content in the well logging and the attribute model of the fault gouge ratio containing mud;

[0124] The fourth secondary submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the relationship between the fault pressure difference and the depth and the relationship between the fault mud ratio and the depth.

[0125] In an embodiment of the present invention, the first parameters include fluid type, fluid density, hydrocarbon column height, trapped oil and gas height, oil-water interface height, trap closure height and overflow point position of the fluid on both sides of the fault.

[0126] In the embodiment of the present invention, the analysis module includes a third first-level submodule and a fourth first-level submodule;

[0127] The third primary submodule is used to establish a breakthrough pressure model based on the functional relationship of the closed outer envelope of the gas storage group;

[0128] The fourth first-level submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the critical value of the sealing fault mud ratio.

[0129] In the embodiment of the present invention, the fourth level 1 submodule includes a fifth level 2 submodule and a sixth level 2 submodule;

[0130] The fifth secondary submodule is used to determine the position of the fault weak point based on the constraint of the critical value of the closed fault mud ratio;

[0131] The sixth secondary submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the location of the weak point of the fault.

[0132] In the embodiment of the present invention, the six level-2 submodules include a first level-3 submodule and a second level-3 submodule;

[0133] The first three-level submodule is used to determine the maximum pressure that the fault weak point can withstand based on the breakthrough pressure model and the location of the fault weak point;

[0134] The second and third level submodules are used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the maximum pressure that the weak point of the fault can withstand.

[0135] In an embodiment 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;

[0136] A memory for storing programs and / or instructions;

[0137] A processor, configured to execute the program and / or instructions;

[0138] Wherein, when the processor executes the program and / or instruction, it implements the quantitative evaluation method of the lateral sealing capacity of the gas storage fault as described above.

[0139] In an embodiment 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 quantitatively evaluating the lateral sealing capacity of a gas storage fault as described above is implemented.

[0140] 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.

[0141] 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 quantitative evaluation method for the lateral sealing capacity of a gas storage fault, characterized in that: include: Determine the fault rock closure of sand-sand butt joint type; Based on the fault rock seal of sand-sand butt joint type, the functional relationship of the outer envelope of the gas storage group seal is constructed; Based on the functional relationship of the closed outer envelope of the gas storage group, the critical value of the closed fault mud ratio is determined; Based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

2. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 1 is characterized in that: The fault rock closure of the sand-sand butt joint type is determined by the lithology triangle plate.

3. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 2 is characterized in that: The lithology triangle is established based on well data, layering and shale content parameters.

4. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to any one of claims 1 to 3, characterized in that: The functional relationship of constructing the outer envelope of the gas storage group closure based on the sand-sand butt joint type fault rock closure includes: Based on the fault rock seal of sand-sand butt joint type and the fault mud ratio attribute model containing mud, the relationship between fault pressure difference and fault mud ratio is determined; Based on the relationship between fault pressure difference and fault mud ratio, the functional relationship of the closed outer envelope of the gas storage group is fitted.

5. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 4 is characterized in that: The fault rock sealing and mud ratio attribute model based on the sand-sand joint type and the mud-containing fault rock determines the relationship between the fault pressure difference and the fault rock ratio, including: Based on the fault rock closure and trap dissection method of sand-sand butt joint type, the first fault parameter is obtained; Based on the first parameter of the fault, the relationship between the fault pressure difference and depth in the gas storage reservoir is calculated; Based on the mud content in the well log and the mud ratio attribute model containing mud, the relationship between the mud ratio and depth is determined; Based on the relationship between the fault pressure difference and the depth and the relationship between the fault mud ratio and the depth, the relationship between the fault pressure difference and the fault mud ratio is determined.

6. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 5 is characterized in that: The first parameters include fluid type, fluid density, hydrocarbon column height, trapped oil and gas height, oil-water interface height, trap closure height and overflow point location on both sides of the fault.

7. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to any one of claims 5 to 6, characterized in that: The quantitative evaluation of the lateral sealing capacity of the fault is completed based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio, including: Based on the functional relationship of the closed outer envelope of the gas storage group, a breakthrough pressure model is established; Based on the breakthrough pressure model and the critical value of the sealing fault mud ratio, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

8. The quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 7 is characterized in that: The quantitative evaluation of the lateral sealing capacity of the fault is completed based on the breakthrough pressure model and the critical value of the sealing fault mud ratio, including: Based on the constraint of the critical value of the ratio of the closed fault mud, the location of the weak point of the fault is determined; Based on the breakthrough pressure model and the location of the fault's weak points, a quantitative evaluation of the fault's lateral sealing capacity is completed.

9. A quantitative evaluation method for the lateral sealing capacity of a gas storage fault according to claim 8, characterized in that: Based on the breakthrough pressure model and the location of the fault weak point, complete the quantitative evaluation of the fault lateral sealing capacity, including: Based on the breakthrough pressure model and the location of the fault weak point, determine the maximum pressure that the fault weak point can withstand; Based on the maximum pressure that the weak point of the fault can withstand, a quantitative evaluation of the lateral sealing capacity of the fault is completed.

10. A quantitative evaluation system for the lateral sealing capacity of a gas storage fault, characterized in that: include: determination module, function relationship establishment module, critical value module and analysis module; The determination module is used to determine the fault rock closure of the sand-sand butt joint type; The functional relationship building module is used to construct a functional relationship of the closed outer envelope of the gas storage group based on the fault rock closure of the sand-sand butt joint type; The critical value module is used to determine the critical value of the closed fault mud ratio based on the functional relationship of the closed outer envelope of the gas storage group; The analysis module is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the functional relationship of the closed outer envelope of the gas storage group and the critical value of the closed fault mud ratio.

11. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 10, characterized in that: The fault rock closure of the sand-sand butt joint type is determined by the lithology triangle plate.

12. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 11, characterized in that: The lithology triangle is established based on well data, layering and shale content parameters.

13. The quantitative evaluation system for lateral sealing capacity of faults in a gas storage facility according to any one of claims 10 to 12, characterized in that: The functional relationship establishment module includes a first level submodule and a second level submodule; The first level submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the fault rock sealing of the sand-sand butt joint type and the fault mud ratio attribute model containing mud; The second level submodule is used to fit the functional relationship of the closed outer envelope of the gas storage group based on the relationship between the fault pressure difference and the fault mud ratio.

14. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 13, characterized in that: The first level submodule includes a first level submodule, a second level submodule, a third level submodule and a fourth level submodule; The first secondary submodule is used to obtain the first fault parameter based on the fault rock closure and trap dissection method of the sand-sand docking type; The second secondary submodule is used to calculate the relationship between the fault pressure difference and the depth in the gas storage reservoir based on the first fault parameter; The third secondary submodule is used to determine the relationship between the fault gouge ratio and the depth based on the mud content in the well logging and the attribute model of the fault gouge ratio containing mud; The fourth secondary submodule is used to determine the relationship between the fault pressure difference and the fault mud ratio based on the relationship between the fault pressure difference and the depth and the relationship between the fault mud ratio and the depth.

15. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 14, characterized in that: The first parameters include fluid type, fluid density, hydrocarbon column height, trapped oil and gas height, oil-water interface height, trap closure height and overflow point location on both sides of the fault.

16. The quantitative evaluation system for lateral sealing capacity of faults of a gas storage reservoir according to any one of claims 14 to 15, characterized in that: The analysis module includes a third primary submodule and a fourth primary submodule; The third primary submodule is used to establish a breakthrough pressure model based on the functional relationship of the closed outer envelope of the gas storage group; The fourth first-level submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the critical value of the sealing fault mud ratio.

17. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 16, characterized in that: The fourth primary submodule includes a fifth secondary submodule and a sixth secondary submodule; The fifth secondary submodule is used to determine the position of the fault weak point based on the constraint of the critical value of the closed fault mud ratio; The sixth secondary submodule is used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the breakthrough pressure model and the location of the weak point of the fault.

18. The quantitative evaluation system for lateral sealing capacity of gas storage faults according to claim 17, characterized in that: The six secondary submodules include a first tertiary submodule and a second tertiary submodule; The first three-level submodule is used to determine the maximum pressure that the fault weak point can withstand based on the breakthrough pressure model and the location of the fault weak point; The second and third level submodules are used to complete the quantitative evaluation of the lateral sealing capacity of the fault based on the maximum pressure that the weak point of the fault can withstand.

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 quantitative evaluation method of the lateral sealing capacity of the gas storage fault as described in any one of claims 1 to 9.

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 quantitatively evaluating the lateral sealing capacity of a gas storage fault according to any one of claims 1 to 9 is implemented.

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