Oil and gas reservoir reserve determination method, device, storage medium and electronic equipment

Abstract

The present application relates to the field of oil and gas reservoir exploration technology, and specifically to a method, device, storage medium and electronic device for determining oil and gas reservoir reserves, which solves the problem that the existing technology cannot accurately determine the reserves of oil and gas reservoirs. The method includes: obtaining a three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area; analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area; the local stress anomaly data can accurately indicate the difference in oil content index of adjacent areas of the oil-bearing fault, and obtain the oil content segmentation results of the fault according to the local stress anomaly data, and finally gradually calculate and superimpose the geological reserves of multiple sections of oil-bearing reservoirs to accurately obtain the oil and gas reservoir reserves in the target area. In the case of uneven cave sizes in the strike-slip fault-controlled fracture-cavity oil and gas reservoir in the target area, the oil and gas reservoir reserves of the oil and gas reservoir can also be accurately calculated.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas reservoir exploration, and in particular to a method, device, storage medium and electronic equipment for determining oil and gas reservoir reserves. Background Art

[0002] With the progress of oil and gas exploration, fault-controlled fracture-cave oil and gas reservoirs have gradually become exploration targets. Fault-controlled fracture-cave oil and gas reservoirs are a type of carbonate oil and gas reservoirs. The distribution area of ​​carbonate rocks accounts for 20% of the total sedimentary rock area in the world, and the oil and gas reserves they contain account for 52% of the world's total reserves. However, fracture-cave carbonate oil and gas reservoirs are often subject to multi-stage and multi-cycle geological effects during the accumulation process. Under the combined effects of sedimentation, diagenesis, and structure, they have strong heterogeneity. The difficulty of research is much higher than that of ordinary sandstone oil and gas reservoirs, especially ultra-deep strike-slip fault-controlled fracture-cave carbonate oil reservoirs. Compared with other types of oil and gas reservoirs, the fracture-cave system directly related to the main section occupies the largest proportion in the entire reservoir space. In some local areas, large caves of meter size can even be seen, which can greatly increase oil and gas reserves. The development of fractures in carbonate reservoirs mainly plays the role of migration channels, which can greatly increase the permeability of the reservoir.

[0003] Due to the heterogeneity of carbonate reservoirs, when the traditional recoverable reserves water flooding method, complex carbonate oil and gas reservoir modeling method, controlled reserves material balance method and fracture-cavity quantification technology are used to calculate the reserves of carbonate oil and gas reservoirs, the calculation results obtained cannot accurately reflect the reserves of the oil and gas reservoirs. Summary of the invention

[0004] In response to the above problems, the present application provides a method, device, storage medium and electronic device for determining oil and gas reservoir reserves.

[0005] In a first aspect, the present application provides a method for determining oil and gas reservoir reserves, the method comprising:

[0006] Obtain the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area;

[0007] Analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area;

[0008] Obtaining the oil content segmentation result of the fracture according to the local stress anomaly data;

[0009] The oil and gas reservoir reserves in the target area are obtained based on the oil-bearing segmentation results of the fracture and the oil and gas reservoir engineering parameters.

[0010] In the above implementation process, in order to accurately determine the oil and gas reservoir reserves in the target area, the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area are first obtained, and then the three-dimensional geomechanical model is analyzed to obtain the local stress anomaly data within the preset range of the fault zone in the target area. The local stress anomaly data can accurately indicate the difference in oil content index of adjacent areas of the oil-bearing fault. The oil content segmentation results of the fault are obtained according to the local stress anomaly data. Finally, the geological reserves of multiple oil-bearing reservoirs are gradually calculated and superimposed to accurately obtain the oil and gas reservoir reserves in the target area. The oil and gas reservoir reserves of the oil and gas reservoir can also be accurately calculated in the case of uneven cave sizes in the strike-slip fault-controlled fracture-cavity oil and gas reservoir in the target area.

[0011] According to an embodiment of the present application, optionally, in the above method for determining oil and gas reservoir reserves, obtaining a three-dimensional geomechanical model of the target area includes:

[0012] Acquire 3D seismic volume data and coherent volume data of the target area;

[0013] A three-dimensional structural model of the target area is established by adopting the modeling methods of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin;

[0014] Acquiring geomechanical parameters of a target area corresponding to the three-dimensional structural model;

[0015] A three-dimensional geomechanical model of the target area is determined according to the three-dimensional structural model and the geomechanical parameters.

[0016] In the above implementation process, based on the pre-acquired three-dimensional seismic volume data and coherent volume data, the vertical stratification, plane segmentation, vertical multi-stage superposition and horizontal section modeling of small and medium-scale strike-slip faults in the basin can be used to accurately establish a three-dimensional structural model of the target area, which can accurately simulate the geological structure of the target area. Then, a three-dimensional geomechanical model is obtained according to the corresponding geomechanical parameters, which can more accurately simulate the mechanical and structural characteristics of the target area.

[0017] According to an embodiment of the present application, optionally, in the above-mentioned method for determining oil and gas reservoir reserves, the geomechanical parameters include the direction of the geostress field, the magnitude of the geostress field and the rock mechanics parameters along the well axis.

[0018] According to an embodiment of the present application, optionally, in the above-mentioned method for determining oil and gas reservoir reserves, obtaining the fracture oil-bearing segmentation result according to the local stress anomaly data includes:

[0019] Determining a fracture oil content index according to the local stress anomaly data;

[0020] The target area is divided into a plurality of oil-bearing sections according to the variation range of the mean value of the fracture oil-bearing index, and the fracture oil-bearing sectioning result is obtained.

[0021] The fault oil content index can be determined based on the local stress anomaly data, and then the target area can be divided into multiple oil-bearing sections according to the uniform change range of the fault oil content index. The area where the fault oil content index changes greatly is used as the dividing boundary, and the area where the fault oil content index does not change much is divided into an overall oil-bearing section to ensure that the oil and gas reserves in each oil-bearing section are evenly distributed, avoiding inaccurate calculations due to uneven distribution of oil and gas reserves in an overall oil-bearing section.

[0022] According to an embodiment of the present application, optionally, in the above-mentioned method for determining oil and gas reservoir reserves, the analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area includes:

[0023] The normal stress of the fracture surface is determined according to the first formula; wherein the first formula is:

[0024]

[0025] Wherein, σ represents the normal stress of the fracture surface, β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress;

[0026] The fracture surface shear stress is determined according to the second formula; wherein the second formula is:

[0027]

[0028] Among them, τ represents the shear stress of the fracture surface; β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress; the local stress anomaly data includes the normal stress of the fracture surface and the shear stress of the fracture surface.

[0029] According to an embodiment of the present application, optionally, in the above method for determining oil and gas reservoir reserves, determining the fracture oil content index according to the local stress anomaly data includes:

[0030] The fracture oil content index is determined by a third formula according to the fracture surface normal stress and the fracture surface shear stress; wherein the third formula is:

[0031]

[0032] Wherein, L represents the fracture oil content index, σ represents the normal stress of the fracture surface, τ represents the shear stress of the fracture surface, α represents the coefficient related to the formation conditions, and Ks represents the initial stability coefficient related to the fault strength.

[0033] According to an embodiment of the present application, optionally, in the above method for determining oil and gas reservoir reserves, obtaining the oil and gas reservoir reserves of the target area according to the oil-bearing segmentation results of the fracture and the oil and gas reservoir engineering parameters includes:

[0034] The oil and gas reserves in the target area are determined by the fourth formula, wherein the fourth formula is:

[0035] N=∑∫∫∫L(x,y,z)H(x,y)φ(x,y,z)So(x,y,z)dxdydz / Boi

[0036] Wherein, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, φ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and the oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

[0037] In a second aspect, the present application provides a device for determining oil and gas reservoir reserves, the device comprising:

[0038] Data acquisition module, used to obtain the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area;

[0039] An analysis module, used for analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area;

[0040] An oil content segmentation module is used to obtain a fracture oil content segmentation result according to the local stress anomaly data;

[0041] The reserve acquisition module is used to acquire the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and the oil and gas reservoir engineering parameters.

[0042] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the data acquisition module includes:

[0043] A data acquisition unit, used for acquiring three-dimensional seismic volume data and coherent volume data of a target area;

[0044] A model construction unit is used to establish a three-dimensional structural model of the target area by adopting a modeling method of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin;

[0045] A mechanical parameter acquisition unit, used to acquire geomechanical parameters of a target area corresponding to the three-dimensional structural model;

[0046] The geomechanical model determination unit is used to determine the three-dimensional geomechanical model of the target area according to the three-dimensional structural model and the geomechanical parameters.

[0047] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the geomechanical parameters include the direction of the geostress field, the magnitude of the geostress field and the rock mechanics parameters along the well axis.

[0048] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the oil content segmentation module includes:

[0049] A fracture oil content index determination unit, used to determine the fracture oil content index according to the local stress anomaly data;

[0050] The fracture oil content segmentation result acquisition unit is used to divide the target area into multiple oil-bearing sections according to the mean change range of the fracture oil content index to obtain the fracture oil content segmentation result.

[0051] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the analysis module includes:

[0052] The fracture surface normal stress determination unit is used to determine the fracture surface normal stress according to a first formula; wherein the first formula is:

[0053]

[0054] Wherein, σ represents the normal stress of the fracture surface, β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress;

[0055] The fracture surface shear stress determination unit is used to determine the fracture surface shear stress according to a second formula; wherein the second formula is:

[0056]

[0057] Among them, τ represents the shear stress of the fracture surface; β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress; the local stress anomaly data includes the normal stress of the fracture surface and the shear stress of the fracture surface.

[0058] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the fracture oil content index determination unit includes:

[0059] The fracture oil content index determination subunit is used to determine the fracture oil content index through a third formula according to the fracture surface normal stress and the fracture surface shear stress; wherein the third formula is:

[0060]

[0061] Wherein, L represents the fracture oil content index, σ represents the normal stress of the fracture surface, τ represents the shear stress of the fracture surface, α represents the coefficient related to the formation conditions, and Ks represents the initial stability coefficient related to the fault strength.

[0062] According to an embodiment of the present application, optionally, in the above-mentioned oil and gas reservoir reserve determination device, the reserve acquisition module includes:

[0063] The oil and gas reservoir reserve determination unit is used to determine the oil and gas reservoir reserves in the target area by using a fourth formula, wherein the fourth formula is:

[0064] N=∑∫∫∫L(x,y,z)H(x,y)φ(x,y,z)So(x,y,z)dxdydz / Boi

[0065] Wherein, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, φ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and the oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

[0066] In a third aspect, the present application provides a storage medium, which stores a computer program that can be executed by one or more processors and can be used to implement the above-mentioned method for determining oil and gas reservoir reserves.

[0067] In a fourth aspect, the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the above-mentioned method for determining oil and gas reservoir reserves is executed.

[0068] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0069] The present application provides a method, device, storage medium and electronic device for determining oil and gas reservoir reserves, the method comprising: obtaining a three-dimensional geomechanical model and oil and gas reservoir engineering parameters of a target area; analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of a fault zone in the target area; obtaining a fault oil-bearing segmentation result based on the local stress anomaly data; and obtaining oil and gas reservoir reserves in the target area based on the fault oil-bearing segmentation result and the oil and gas reservoir engineering parameters. The method can obtain a three-dimensional geomechanical model of the target area based on reservoir geomechanics theory, and then analyze the three-dimensional geomechanical model of the strike-slip fault in the target area with the help of a finite element simulation method of a local stress field, so as to accurately quantitatively calculate the oil-bearing index of different parts of the fault surface of the strike-slip fault, and then determine the fault oil-bearing segmentation result based on the difference in oil-bearing index of adjacent areas of the oil-bearing fault, and finally gradually calculate and superimpose the geological reserves of multiple sections of oil-bearing reservoirs to accurately obtain the oil and gas reservoir reserves in the target area. This method avoids the inaccuracy of traditional methods for determining oil and gas reservoir reserves, and can accurately calculate the oil and gas reservoir reserves even when the size of the caves and fractures in the strike-slip fault-controlled fracture-cavity oil and gas reservoirs in the target area is uneven. This provides a reliable reference for the overall evaluation and development plan designation of ultra-deep strike-slip fault-controlled oil and gas reservoirs, and is of great significance for the quantitative evaluation and efficient development of carbonate strike-slip fault-controlled oil and gas reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Hereinafter, the present application will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0071] Figure 1 A schematic flow chart of a method for determining oil and gas reservoir reserves provided in Example 1 of the present application.

[0072] Figure 2 A schematic flow chart of a method for obtaining fracture oil content segmentation results provided in Example 3 of the present application.

[0073] Figure 3 A schematic diagram of a three-dimensional geomechanical model provided in Example 4 of the present application.

[0074] Figure 4 A schematic diagram of reservoir segmentation provided in Example 4 of the present application.

[0075] Figure 5 A schematic diagram of another reservoir segmentation provided in Example 4 of the present application.

[0076] Figure 6 A schematic diagram of another reservoir segmentation provided in Example 4 of the present application.

[0077] Figure 7This is a schematic diagram of the structure of an oil and gas reservoir reserve determination device provided in Example 5 of the present application.

[0078] Figure 8 A schematic diagram of the structure of an electronic device provided in Example 7 of the present application.

[0079] In the drawings, the same reference numerals are used for the same components, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0080] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present application.

[0081] Embodiment 1

[0082] The present invention provides a method for determining oil and gas reservoir reserves. Figure 1 , the method comprises the following steps:

[0083] Step S110: Acquire the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area.

[0084] When obtaining the three-dimensional geomechanical model of the target area, the three-dimensional seismic volume data and coherent volume data of the target area can be obtained first, and then the three-dimensional structural model of the target area is established by adopting the modeling methods of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin. Then, the geomechanical parameters of the target area corresponding to the three-dimensional structural model are obtained, and the three-dimensional geomechanical model of the target area is determined based on the three-dimensional structural model and the geomechanical parameters.

[0085] Coherent data volume mainly uses the seismic signal similarity between adjacent traces in the three-dimensional data volume to describe the lateral heterogeneity of strata and lithology. In the process of fault identification and special lithology, the interpretation of coherent data volume is more comprehensive. Three-dimensional seismic volume data mainly uses adjacent seismic trace data to calculate coherent attributes, reflecting the similarity of seismic traces and new data volumes. During the application of coherent data volume, a series of low correlation values ​​can obtain the contour along the fault. The repetition of a series of time slices makes the correlation contour a cross section. Low correlation contours can also be obtained at the boundary of strata and the disconnection of special rocks, which helps to identify faults and irregular structures. Since the discontinuity in the stratum is expressed in the coherent volume as a low coherence value, it can be fed back through coherent time slices and coherent layer flattening slices. Therefore, when the coherent data volume is applied in the three-dimensional seismic interpretation process, it can improve the judgment level of small faults, distribute small fault planes, enhance the speed and accuracy of large fault interpretation, and detect tunnels and delineate the boundaries of goaf areas. Therefore, when establishing a three-dimensional structural model of the target area, the use of the previously acquired three-dimensional seismic volume data and coherent volume data can better describe the heterogeneity of the strata and lithology, thereby ensuring the accuracy of the established three-dimensional structural model.

[0086] In order to enable the 3D structural model to accurately and comprehensively simulate the geological structure of the target area, the geomechanical parameters of the target area can be obtained, and the 3D geomechanical model can be determined based on the 3D structural model and the geomechanical parameters. Among them, the geomechanical parameters can be determined based on the interpretation results of the logging data of the actual drilling characteristic wells and the rock mechanics test results in the core chamber.

[0087] The oil and gas reservoir engineering parameters can be obtained from the existing well data in the target area. For example, the porosity of different parts of the fault zone can be determined based on the acoustic time difference logging, neutron logging, and density logging data of characteristic wells distributed in different parts of the fault. The effective thickness and oil saturation of the reservoir can also be determined based on the oil and gas anomaly display results and resistivity logging interpretation results of the characteristic wells. The crude oil volume coefficient can be determined based on the test data of the produced crude oil. In addition, the oil and gas reservoir factory parameters can also be obtained by other means, and the acquisition method is not limited here, and can be obtained according to the actual situation. For example, the oil and gas reservoir engineering parameters can also be obtained from the historical data in the database.

[0088] Step S120: Analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area.

[0089] The mechanical properties and structures of strike-slip fault structures will change dramatically in different regions and at different times, because of its diverse structural styles, long activity time, deep cutting and long extension. Strike-slip faults are also called transverse thrust formations. In strike-slip fault systems, the sedimentation rate of strike-slip basins is very fast, which can effectively control the closure and trapping conditions of reservoirs, thereby providing favorable conditions for the preservation and formation of organic matter, and promoting the formation of oil and gas reservoirs to a certain extent. In order to accurately analyze the strike-slip structures in the target area, the finite element method can be used to simulate and analyze the three-dimensional geomechanical model to obtain the local stress anomaly data within the preset range of the fault zone in the target area, so as to ensure that the reserves of oil and gas reservoirs can be accurately determined. The finite element analysis method is to simulate the real physical system by mathematical approximation. By using simple and interacting elements, a finite number of unknown quantities can be used to approximate the real system of infinite unknown quantities. Finite element analysis replaces complex problems with simpler problems and then solves them. It regards the solution domain as consisting of many small interconnected subdomains called finite elements, assumes a suitable approximate solution for each unit, and then derives the total satisfaction conditions of the domain to obtain the solution to the problem. Because the actual problem is replaced by a simpler problem, this solution is not an exact solution, but an approximate solution. Since most actual problems are difficult to obtain exact solutions, and finite elements not only have high calculation accuracy, but can also adapt to various complex shapes, it has become an effective engineering analysis tool.

[0090] Step S130: Obtaining the fracture oil content segmentation result according to the local stress anomaly data.

[0091] According to the local stress anomaly data, the target area with little difference in oil content can be divided into an integral segment, and the area with large difference is the boundary of division, so as to ensure that the oil content in each integral segment in the oil content segmentation result is uniform.

[0092] Step S140: Obtain the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and oil and gas reservoir engineering parameters.

[0093] The fault zone structure in the target area makes the oil and gas reservoirs unevenly distributed. In order to detect the reserves of unevenly distributed oil and gas reservoirs, the fault oil-bearing segmentation results can be obtained based on the local stress anomaly data. Then, based on the fault oil-bearing segmentation results and the oil and gas reservoir engineering parameters, the geological reserves of each oil and gas reservoir group are calculated respectively, and all the calculation results are superimposed to obtain the accurate oil and gas reservoir reserves.

[0094] In summary, the embodiment of the present application discloses a method for determining oil and gas reservoir reserves, including: obtaining a three-dimensional geomechanical model and oil and gas reservoir engineering parameters of a target area; analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of a fault zone in the target area; obtaining a fault oil-bearing segmentation result based on the local stress anomaly data; and obtaining oil and gas reservoir reserves in the target area based on the fault oil-bearing segmentation result and the oil and gas reservoir engineering parameters. The method can obtain a three-dimensional geomechanical model of the target area based on reservoir geomechanics theory, and then analyze the three-dimensional geomechanical model of the strike-slip fault in the target area with the help of a finite element simulation method of a local stress field, so that the oil-bearing index of different parts of the fault surface of the strike-slip fault can be accurately quantitatively calculated, and then the fault oil-bearing segmentation result is determined based on the difference in oil-bearing index of adjacent areas of the oil-bearing fault, and finally the geological reserves of multiple sections of oil-bearing reservoirs are gradually calculated and superimposed to accurately obtain the oil and gas reservoir reserves in the target area. This method avoids the inaccuracy of traditional methods for determining oil and gas reservoir reserves, and can accurately calculate the oil and gas reservoir reserves even when the size of the caves and fractures in the strike-slip fault-controlled fracture-cavity oil and gas reservoirs in the target area is uneven. This provides a reliable reference for the overall evaluation and development plan designation of ultra-deep strike-slip fault-controlled oil and gas reservoirs, and is of great significance for the quantitative evaluation and efficient development of carbonate strike-slip fault-controlled oil and gas reservoirs.

[0095] Embodiment 2

[0096] Based on the first embodiment, this embodiment illustrates the method in the first embodiment through a specific implementation case.

[0097] When obtaining the three-dimensional geomechanical model of the target area, first establish the three-dimensional structural model of the target area, then obtain the geomechanical parameters of the target area corresponding to the three-dimensional structural model, and determine the three-dimensional geomechanical model of the target area based on the three-dimensional structural model and the geomechanical parameters. Among them, the geomechanical parameters include the direction of the geostress field, the magnitude of the geostress field, and the rock mechanics parameters along the well axis. When obtaining the direction of the geostress field, the data obtained from paleomagnetic and acoustic anisotropy experiments conducted by actual drilling and coring can be used to determine the direction of the minimum horizontal principal stress, which is the direction of the geostress field. In addition, the direction of the geostress field can also be determined based on the wellbore curve calculation method, the induced fracture orientation statistics method, and the three-wellbore curve normalization method.

[0098] The data obtained from the paleomagnetic and acoustic anisotropy experiments using real core drilling are used to determine the direction of the minimum horizontal principal stress. The specific paleomagnetic calculation formula is as follows:

[0099]

[0100] Among them, α represents the magnetic declination, y represents the residual magnetic vector in the Y-axis direction, and x represents the residual magnetic vector in the X-axis direction.

[0101] The specific calculation formula for determining the direction of the minimum horizontal principal stress by the wave velocity anisotropy test method based on the paleomagnetic calculation results is as follows:

[0102] θ=α+β

[0103] Among them, θ represents the direction of the minimum horizontal principal stress, α represents the magnetic declination, β represents the angle between the minimum horizontal principal stress and the core marker line of the paleomagnetic experiment, and β comes from the experimental results of the wave velocity anisotropy test.

[0104] It should be noted that in order to ensure the accuracy of the direction of the geostress field, the direction of the geostress field can be corrected after it is obtained. The direction of the geostress field is corrected in combination with the wellbore collapse and induced fracture development orientation observed by imaging logging.

[0105] The magnitude of the geostress field includes the local minimum horizontal principal stress and the local maximum horizontal principal stress.

[0106] When calculating the magnitude of the geostress field, the vertical stress can be calculated based on the density logging:

[0107]

[0108] Among them, Sv represents vertical stress, ρ represents density of overlying rock, g represents acceleration of gravity, and h represents burial depth.

[0109] Then, the local minimum horizontal principal stress is calculated based on the acid fracturing and ground failure experiments:

[0110] P b =Sh

[0111] Among them, P b represents the reservoir pore pressure, and Sh represents the local minimum horizontal principal stress.

[0112] Finally, the effective stress ratio method is used to verify:

[0113] (Sh-Pp) / (Sv-Pp)=γ

[0114] Among them, Sv represents vertical stress, Sh represents local minimum horizontal principal stress, Pp represents reservoir pore pressure, and γ represents the effective stress coefficient related to geological conditions.

[0115] When calculating the maximum horizontal principal stress, it can be calculated based on the uniaxial compressive strength of the core and the stress quadrilateral method.

[0116] Embodiment 3

[0117] Based on the first embodiment, this embodiment illustrates the method in the first embodiment through a specific implementation case.

[0118] Please see Figure 2 When obtaining the oil-bearing segmentation results of the fracture based on the local stress anomaly data, the following steps are included:

[0119] Step S131: determining the fracture oil content index according to the local stress anomaly data.

[0120] The stresses exerted on the cross section in a strike-slip fault structure include the normal stress of the fault surface and the shear stress of the fault surface. The action of these two forces directly determines the activity of the fault eye, fault zone or cross section, and whether the fault is closed. Therefore, based on the normal stress of the fault surface and the shear stress of the fault surface, the closure of the fault in the target area can be understood, and then the distribution of oil and gas reservoirs in the target area can be predicted.

[0121] Step S132: Divide the target area into multiple oil-bearing sections according to the mean variation range of the fracture oil-bearing index, and obtain the fracture oil-bearing sectioning result.

[0122] Based on the local stress field anomaly data within the preset range of the fault zone and the rock mechanical kinematics principle, a method for using the oil content index to evaluate the oil content of the fault in the target area in sections can be proposed. After calculating the oil content index of the fault, the fault zone whose mean change of the oil content index along the fault zone is less than the preset value can be divided into the same oil-bearing section. For example, the fault zone whose mean change of the oil content index along the fault zone is less than 0.01m can be divided into the same oil-bearing section, and the fault zone whose mean change of the oil content index along the fault zone is less than 0.02m can be divided into the same oil-bearing section. It can be understood that the preset value can be determined according to actual needs.

[0123] When analyzing the three-dimensional geomechanical model and obtaining the local stress anomaly data within the preset range of the fault zone in the target area, the normal stress of the fault surface can be determined according to the first formula. The first formula is:

[0124]

[0125] Among them, σ represents the normal stress of the fracture surface, β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress;

[0126] Then, the fracture surface shear stress is determined according to the second formula. The second formula is:

[0127]

[0128] Among them, τ represents the shear stress of the fracture surface; β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress; the local stress anomaly data include the normal stress of the fracture surface and the shear stress of the fracture surface.

[0129] Then, when determining the fracture oil content index based on the local stress anomaly data, it includes:

[0130] The fracture oil content index is determined by the third formula according to the fracture surface normal stress and fracture surface shear stress; wherein the third formula is:

[0131]

[0132] Among them, L represents the oil content index of the fault, σ represents the normal stress of the fault surface, τ represents the shear stress of the fault surface, α represents the coefficient related to the formation conditions, and Ks represents the initial stability coefficient related to the fault strength.

[0133] According to this embodiment, when obtaining the oil and gas reservoir reserves in the target area according to the oil-bearing segmentation results of the fracture and the oil and gas reservoir engineering parameters, the oil and gas reservoir reserves in the target area can be determined by the fourth formula, wherein the fourth formula is:

[0134] N=∑∫∫∫L(x,y,z)H(x,y)φ(x,y,z)So(x,y,z)dxdydz / Boi

[0135] Among them, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, φ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

[0136] Embodiment 4

[0137] The oil and gas reservoir reserve determination method provided in Example 1 is used to quantitatively evaluate the geological reserves of the oil reservoir in the S5 fault zone of the Shunbei Oil and Gas Field. Figure 3 The S5 fault zone of Shunbei Oil and Gas Field is 52 km long in the work area. There are grabens on its east and west sides and a central fault in the middle. Based on the mechanical mobility of the strike-slip fault under the current geostress field, the graben on the east side can be divided into 12 reservoir segments, the central fault can be divided into 18 reservoir segments, and the graben on the west side can be divided into 18 reservoir segments. For details, see Figure 4 , Figure 5 and Figure 6 The length, connectivity and oil and gas reservoir reserves of each section are calculated and shown in Table 1 below.

[0138] Table 1:

[0139] serial number Connectivity length Oil content index Oil and gas reserves West-1 0.902km 0.49 452375.3892t West-2 3.306km 0.65 2394948.199t West-3 1.503km 0.50 837546.4522t West-4 3.006km 0.67 2244624.492t

[0140] Table 1 continued:

[0141] West-5 4.208km 0.57 2673194.17t West-6 7.514km 0.68 5694558.015t West-7 1.803km 0.57 1145382.388t West-8 4.208km 0.70 3282870.033t West-9 1.202km 0.54 723399.4028t West-10 4.689km 0.63 3292309.844t West-11 3.006km 0.56 1876104.053t West-12 2.705km 0.7 2110305t West-13 2.405km 0.66 1769045.221t West-14 2.405km 0.71 1903063.798t West-15 0.902km 0.29 291530.8064t West-16 3.607km 0.60 2412000.042t West-17 3.006km 0.45 1507583.614t West-18 2.104km 0.58 1360046.156t Medium - 1 0.928km 0.64 661923.6047t Medium-2 1.548km 0.58 1000642.324t Medium-3 1.548km 0.65 1121409.501t Medium - 4 0.619km 0.54 372532.6376t Medium-5 1.238km 0.60 827850.3057t Medium-6 1.548km 0.61 1052399.686t Medium-7 1.548km 0.66 1138661.955t Medium -8 0.619km 0.54 372532.6376t

[0142] Table 1 continued:

[0143] Medium - 9 3.405km 0.62 2352820.113t Medium - 10 1.857km 0.65 1345256.747t Middle-11 5.881km 0.65 4260341.91t Medium-12 1.238km 0.45 620887.7293t Medium-13 2.166km 0.70 1689804.299t Medium-14 7.119km 0.62 4919156.061 Medium - 15 3.405km 0.60 2276922.69t Medium-16 1.238km 0.40 551900.2038t Medium-17 7.428km 0.68 5629382.079t Medium-18 9.286km 0.64 6623515.725t East-1 2.377km 0.59 1563007.679t East-2 22.583km 0.63 15856309.07t

[0144] The total reserves of oil and gas reservoirs in each of the 12 reservoir sections divided by the eastern graben of the S5 fault zone in Shunbei Oil and Gas Field, the 18 reservoir sections divided by the central fault, and the 18 reservoir sections divided by the western graben are 108,553,877.4305 tons. The geological reserves of the S5 fault zone in Shunbei Oil and Gas Field were estimated to be 99.19 million tons by the carving method in the early stage, and the result calculated by this method is about 108.55 million tons, with a difference of +9.4%, which also verifies the scientificity and applicability of this method in the S5 ultra-deep strike-slip fault controlled reservoir.

[0145] Embodiment 5

[0146] Please see Figure 7 The present application provides a device 700 for determining oil and gas reservoir reserves, the device comprising:

[0147] Data acquisition module 710, used to obtain the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area;

[0148] Analysis module 720, used to analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area;

[0149] The oil content segmentation module 730 is used to obtain the oil content segmentation result of the fracture according to the local stress anomaly data;

[0150] The reserve acquisition module 740 is used to acquire the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and the oil and gas reservoir engineering parameters.

[0151] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the data acquisition module 710 includes:

[0152] A data acquisition unit, used for acquiring three-dimensional seismic volume data and coherent volume data of a target area;

[0153] Model structural unit, used to establish a three-dimensional structural model of the target area by adopting the modeling methods of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin;

[0154] A mechanical parameter acquisition unit, used to acquire geomechanical parameters of a target area corresponding to the three-dimensional structural model;

[0155] The geomechanical model determination unit is used to determine the three-dimensional geomechanical model of the target area based on the three-dimensional structural model and geomechanical parameters.

[0156] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the geomechanical parameters include the direction of the geostress field, the magnitude of the geostress field and the rock mechanics parameters along the well axis.

[0157] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the oil content segmentation module 730 includes:

[0158] A fracture oil content index determination unit, used to determine the fracture oil content index according to the local stress anomaly data;

[0159] The fracture oil content segmentation result acquisition unit is used to divide the target area into multiple oil-bearing sections according to the mean change range of the fracture oil content index to obtain the fracture oil content segmentation result.

[0160] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the analysis module 720 includes:

[0161] The fracture surface normal stress determination unit is used to determine the fracture surface normal stress according to a first formula; wherein the first formula is:

[0162]

[0163] Among them, σ represents the normal stress of the fracture surface, β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress;

[0164] The fracture surface shear stress determination unit is used to determine the fracture surface shear stress according to the second formula; wherein the second formula is:

[0165]

[0166] Among them, τ represents the shear stress of the fracture surface; β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress; the local stress anomaly data include the normal stress of the fracture surface and the shear stress of the fracture surface.

[0167] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the fracture oil content index determination unit includes:

[0168] The fracture oil content index determination subunit is used to determine the fracture oil content index through a third formula according to the fracture surface normal stress and the fracture surface shear stress; wherein the third formula is:

[0169]

[0170] Among them, L represents the oil content index of the fault, σ represents the normal stress of the fault surface, τ represents the shear stress of the fault surface, α represents the coefficient related to the formation conditions, and Ks represents the initial stability coefficient related to the fault strength.

[0171] Optionally, in the above-mentioned oil and gas reservoir reserve determination device 700, the reserve acquisition module 740 includes:

[0172] The oil and gas reservoir reserve determination unit is used to determine the oil and gas reservoir reserves in the target area by using a fourth formula, wherein the fourth formula is:

[0173] N=∑∫∫∫L(x,y,z)H(x,y)φ(x,y,z)So(x,y,z)dxdydz / Boi

[0174] Among them, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, φ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

[0175] In summary, the embodiment of the present application discloses a device 700 for determining oil and gas reservoir reserves, which includes: a data acquisition module 710, which is used to acquire a three-dimensional geomechanical model and oil and gas reservoir engineering parameters of a target area; an analysis module 720, which is used to analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of a fault zone in the target area; an oil content segmentation module 730, which is used to obtain a fault oil content segmentation result according to the local stress anomaly data; and a reserve acquisition module 740, which is used to obtain oil and gas reservoir reserves in the target area according to the fault oil content segmentation result and oil and gas reservoir engineering parameters. The device can acquire a three-dimensional geomechanical model of the target area based on reservoir geomechanics theory, and then analyze the three-dimensional geomechanical model of the strike-slip fault in the target area with the help of a finite element simulation method of a local stress field, so that the oil content index of different parts of the fault surface of the strike-slip fault can be accurately quantitatively calculated, and then the fault oil content segmentation result is determined according to the difference in oil content index of adjacent areas of the oil-bearing fault, and finally the geological reserves of multiple sections of oil-bearing reservoirs are gradually calculated and superimposed, so as to accurately obtain the oil and gas reservoir reserves in the target area. The device avoids the inaccuracy of traditional methods for determining oil and gas reservoir reserves, and can accurately calculate the oil and gas reservoir reserves even when the size of the caves in the strike-slip fault-controlled fracture-cavity oil and gas reservoir in the target area is uneven. This provides a reliable reference for the overall evaluation and development plan designation of ultra-deep strike-slip fault-controlled oil and gas reservoirs, and is of great significance for the quantitative evaluation and efficient development of carbonate strike-slip fault-controlled oil and gas reservoirs.

[0176] Embodiment 6

[0177] This embodiment also provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, a server, an App application store, etc., on which a computer program is stored. When the computer program is executed by a processor, the following method steps can be implemented:

[0178] Step S110: Acquire the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area.

[0179] Step S120: Analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area.

[0180] Step S130: Obtaining the fracture oil content segmentation result according to the local stress anomaly data.

[0181] Step S140: Obtain the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and oil and gas reservoir engineering parameters.

[0182] Optionally, in the above method for determining oil and gas reservoir reserves, obtaining a three-dimensional geomechanical model of the target area includes the following steps:

[0183] Acquire 3D seismic volume data and coherent volume data of the target area;

[0184] A three-dimensional structural model of the target area is established by adopting the modeling methods of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin;

[0185] Acquiring geomechanical parameters of a target area corresponding to the three-dimensional structural model;

[0186] A three-dimensional geomechanical model of the target area is determined according to the three-dimensional structural model and the geomechanical parameters.

[0187] Optionally, in the above method for determining oil and gas reservoir reserves, obtaining the fracture oil-bearing segmentation result according to the local stress anomaly data comprises the following steps:

[0188] Determining a fracture oil content index according to the local stress anomaly data;

[0189] The target area is divided into a plurality of oil-bearing sections according to the variation range of the mean value of the fracture oil-bearing index, and the fracture oil-bearing sectioning result is obtained.

[0190] Optionally, in the above method for determining oil and gas reservoir reserves, analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area includes the following steps:

[0191] The normal stress of the fracture surface is determined according to the first formula; wherein the first formula is:

[0192]

[0193] Wherein, σ represents the normal stress of the fracture surface, β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress;

[0194] The fracture surface shear stress is determined according to the second formula; wherein the second formula is:

[0195]

[0196] Among them, τ represents the shear stress of the fracture surface; β represents the angle between the local inclination of the fracture and the local SH, θ represents the angle between the local strike of the fracture and the local SH, Sh represents the local minimum horizontal principal stress, SH represents the local maximum horizontal principal stress, and Sv represents the vertical stress; the local stress anomaly data includes the normal stress of the fracture surface and the shear stress of the fracture surface.

[0197] Optionally, in the above method for determining oil and gas reservoir reserves, determining the fracture oil content index according to the local stress anomaly data comprises the following steps:

[0198] The fracture oil content index is determined by a third formula according to the fracture surface normal stress and the fracture surface shear stress; wherein the third formula is:

[0199]

[0200] Wherein, L represents the fracture oil content index, σ represents the normal stress of the fracture surface, τ represents the shear stress of the fracture surface, α represents the coefficient related to the formation conditions, and Ks represents the initial stability coefficient related to the fault strength.

[0201] Optionally, in the above method for determining oil and gas reservoir reserves, obtaining the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and the oil and gas reservoir engineering parameters comprises the following steps:

[0202] The oil and gas reserves in the target area are determined by the fourth formula, wherein the fourth formula is:

[0203] N=∑∫∫∫L(x,y,z)H(x,y)φ(x,y,z)So(x,y,z)dxdydz / Boi

[0204] Wherein, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, φ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and the oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

[0205] The specific implementation process of the above method steps can be found in Example 1, and this embodiment will not be repeated here.

[0206] Embodiment 7

[0207] The present application embodiment provides an electronic device, which may be a mobile phone, a computer or a tablet computer, etc., including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for determining the oil and gas reservoir reserves in the first embodiment is implemented. Figure 8The electronic device 800 may further include a processor 801 , a memory 802 , a multimedia component 803 , an input / output (I / O) interface 804 , and a communication component 805 .

[0208] The processor 801 is used to execute all or part of the steps in the method for determining oil and gas reservoir reserves in Example 1. The memory 802 is used to store various types of data, which may include instructions of any application or method in the electronic device, and data related to the application.

[0209] The processor 801 can be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is used to execute the oil and gas reservoir reserve determination method in the above-mentioned embodiment 1.

[0210] The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0211] The multimedia component 803 may include a screen and an audio component, the screen may be a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, and the microphone is used to receive external audio signals. The received audio signal may be further stored in a memory or sent via a communication component. The audio component also includes at least one speaker for outputting audio signals.

[0212] The I / O interface 804 provides an interface between the processor 801 and other interface modules, which may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.

[0213] The communication component 805 is used for wired or wireless communication between the electronic device 800 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 805 can include: Wi-Fi module, Bluetooth module, NFC module.

[0214] In summary, the present application provides a method, device, storage medium and electronic device for determining oil and gas reservoir reserves, the method comprising: obtaining a three-dimensional geomechanical model and oil and gas reservoir engineering parameters of a target area; analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of a fault zone in the target area; obtaining a fault oil-bearing segmentation result based on the local stress anomaly data; and obtaining oil and gas reservoir reserves in the target area based on the fault oil-bearing segmentation result and the oil and gas reservoir engineering parameters. The method can obtain a three-dimensional geomechanical model of the target area based on reservoir geomechanics theory, and then analyze the three-dimensional geomechanical model of the strike-slip fault in the target area with the help of a finite element simulation method of a local stress field, so that the oil-bearing index of different parts of the fault surface of the strike-slip fault can be accurately quantitatively calculated, and then the fault oil-bearing segmentation result is determined based on the difference in oil-bearing index of adjacent areas of the oil-bearing fault, and finally the geological reserves of multiple sections of oil-bearing reservoirs are gradually calculated and superimposed to accurately obtain the oil and gas reservoir reserves in the target area. This method avoids the inaccuracy of traditional methods for determining oil and gas reservoir reserves, and can accurately calculate the oil and gas reservoir reserves even when the size of the caves and fractures in the strike-slip fault-controlled fracture-cavity oil and gas reservoirs in the target area is uneven. This provides a reliable reference for the overall evaluation and development plan designation of ultra-deep strike-slip fault-controlled oil and gas reservoirs, and is of great significance for the quantitative evaluation and efficient development of carbonate strike-slip fault-controlled oil and gas reservoirs.

[0215] In the several embodiments provided in the present application, it should be understood that the disclosed system and method can also be implemented in other ways. The above described system and method embodiments are merely illustrative.

[0216] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0217] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A method for determining oil and gas reservoir reserves, characterized in that: The method comprises: Obtain the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area; Analyze the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area, wherein the local stress anomaly data includes the normal stress of the fault surface and the shear stress of the fault surface; Obtaining the oil content segmentation result of the fracture according to the local stress anomaly data; Obtaining the oil and gas reservoir reserves in the target area according to the oil-bearing segmentation results of the fault and the oil and gas reservoir engineering parameters; Wherein, obtaining the fracture oil content segmentation result according to the local stress anomaly data includes: Determining a fracture oil content index according to the local stress anomaly data; Dividing the target area into multiple oil-bearing sections according to the mean variation range of the fracture oil-bearing index, and obtaining the fracture oil-bearing sectioning result; Determining the fracture oil content index according to the local stress anomaly data includes: The fracture oil content index is determined by a third formula according to the fracture surface normal stress and the fracture surface shear stress; wherein the third formula is: in, Indicates the fracture oil content index, represents the normal stress on the fracture surface, represents the shear stress on the fracture surface, represents the coefficient related to the formation conditions, Represents the initial stability factor related to the fault strength.

2. The method according to claim 1, characterized in that The step of obtaining a three-dimensional geomechanical model of the target area includes: Acquire 3D seismic volume data and coherent volume data of the target area; A three-dimensional structural model of the target area is established by adopting the modeling methods of longitudinal stratification, plane segmentation, vertical multi-stage superposition and horizontal sectioning of small and medium-scale strike-slip faults in the basin; Acquiring geomechanical parameters of a target area corresponding to the three-dimensional structural model; A three-dimensional geomechanical model of the target area is determined according to the three-dimensional structural model and the geomechanical parameters.

3. The method according to claim 2, characterized in that The geomechanical parameters include the direction of the geostress field, the magnitude of the geostress field and the rock mechanics parameters along the well axis.

4. The method according to claim 1, characterized in that: The analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area includes: The normal stress of the fracture surface is determined according to the first formula; wherein the first formula is: in, represents the normal stress on the fracture surface, The local inclination angle of the fault is The angle between Indicates the local direction and local The angle between represents the local minimum horizontal principal stress, represents the local maximum horizontal principal stress, represents the vertical stress; The fracture surface shear stress is determined according to the second formula; wherein the second formula is: in, represents the shear stress on the fracture surface; The local inclination angle of the fault is The angle between Indicates the local direction and local The angle between represents the local minimum horizontal principal stress, represents the local maximum horizontal principal stress, represents the vertical stress.

5. The method according to claim 1, characterized in that The method of obtaining the oil and gas reservoir reserves in the target area according to the oil-bearing segmentation results of the fracture and the oil and gas reservoir engineering parameters includes: The oil and gas reserves in the target area are determined by the fourth formula, wherein the fourth formula is: Wherein, N represents geological reserves, L represents fracture oil content index, H represents effective reservoir thickness, ϕ represents porosity, So represents oil saturation, Boi represents original crude oil volume coefficient, and the oil and gas reservoir engineering parameters include effective reservoir thickness, porosity, oil saturation and original crude oil volume coefficient.

6. An oil and gas reservoir reserve determination device for implementing the oil and gas reservoir reserve determination method according to any one of claims 1 to 5, characterized in that: The device comprises: Data acquisition module, used to obtain the three-dimensional geomechanical model and oil and gas reservoir engineering parameters of the target area; An analysis module, used for analyzing the three-dimensional geomechanical model to obtain local stress anomaly data within a preset range of the fault zone in the target area; An oil content segmentation module is used to obtain a fracture oil content segmentation result according to the local stress anomaly data; The reserve acquisition module is used to acquire the oil and gas reservoir reserves in the target area according to the fracture oil-bearing segmentation results and the oil and gas reservoir engineering parameters.

7. A storage medium, characterized in that: The computer program stored in the storage medium is used to implement the method according to any one of claims 1 to 5 when executed by one or more processors.

8. An electronic device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method according to any one of claims 1 to 5 is executed.

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