A shale gas preservation condition evaluation parameter acquisition method, device and electronic equipment

Abstract

The present application relates to unconventional oil and gas exploration technical field, disclose a kind of shale gas preservation condition evaluation parameter acquisition method, device and electronic equipment.The method is as follows: selecting profile position;Prepare geological profile;Calculate the burial depth data of purpose layer in different positions of each profile;Prepare the burial depth plan of purpose layer;Obtain the parameter of shale gas preservation condition evaluation of study area.The device is as follows: processing module is used to select profile position;Calculation module is used to calculate the burial depth data of purpose layer in different positions of each profile;Second preparation module is used to prepare the burial depth plan of purpose layer;Obtaining module is used to obtain the parameter of shale gas preservation condition evaluation of study area.The technical scheme of the present application has higher accuracy, can provide important support for the evaluation of shale gas preservation condition in low exploration degree area;Low cost, not dependent on drilling and seismic data, required data is easy to obtain;Strong applicability, can be well applied to vast low exploration degree area lacking drilling and seismic data.

Description

Technical Field

[0001] This invention relates to the field of unconventional oil and gas exploration technology, specifically to a method, apparatus, and electronic device for obtaining shale gas preservation condition evaluation parameters, which can be used to obtain shale gas preservation condition evaluation parameters in low-exploration areas. Background Technology

[0002] The marine organic-rich shale formations in southern China contain abundant shale gas resources. The long and complex geological evolution history has made preservation conditions a crucial determinant of shale gas enrichment and high production. Evaluation indicators for preservation conditions mainly include regional caprock conditions, target layer depth, structural style, structural location, deformation intensity, degree of fracture / fracture development, uplift and erosion, etc. Exploration practice shows that structural preservation conditions are paramount in shale gas preservation condition research. Currently, shale gas exploration and development have achieved good results, but overall exploration research still needs further development, especially in the study of shale gas preservation conditions.

[0003] Currently, evaluation methods for shale gas preservation conditions are all based on drilling and seismic data, and therefore are not applicable to low-exploration areas lacking well and seismic data. For example, a Chinese patent document (application number: CN201910488975.6) discloses a quantitative analysis method for atmospheric pressure shale gas preservation conditions in low-exploration areas. This method provides a standard for assigning values ​​to the quantitative analysis of atmospheric pressure shale gas preservation conditions in low-exploration areas, but does not specify how to obtain the key parameter values.

[0004] The evaluation and selection of low-exploration areas is of great significance for expanding exploration and development areas and realizing the rapid development of the shale gas industry. However, low-exploration areas usually lack drilling and seismic data. How to quickly and accurately obtain key evaluation parameters of shale gas preservation conditions has become an urgent problem to be solved in the shale gas site selection and evaluation process. Summary of the Invention

[0005] This application provides a method, apparatus, and electronic device for obtaining evaluation parameters of shale gas preservation conditions, in order to solve the aforementioned technical problem that the prior art is unable to obtain key evaluation parameters of shale gas preservation conditions.

[0006] According to one aspect of this application, one embodiment provides a method for obtaining shale gas preservation condition evaluation parameters, including:

[0007] Based on basic data including digital elevation data of the surface of the study area and geological maps, profile locations are selected and projected onto the geological maps. Among the selected profile locations, profiles that cut through different locations in the study area are reasonably chosen.

[0008] Read elevation data and compile geological profiles;

[0009] Calculate the burial depth data of the target layer at different locations in each profile;

[0010] Prepare a plan view of the burial depth of the target layer;

[0011] Based on the basic maps, parameters for evaluating the shale gas preservation conditions in the study area are obtained, wherein the basic maps include geological profile maps and / or target layer burial depth plan maps.

[0012] In one embodiment, the criterion for reasonably selecting the cross-section is to reveal the structural morphology and style as completely as possible.

[0013] In one embodiment, reading the elevation data includes:

[0014] Import the surface digital elevation data of the study area into the software, and obtain the corresponding surface elevation data of different profiles based on the coordinate information of the profile location.

[0015] In one embodiment, the compilation of the geological profile map includes:

[0016] Based on the profile length and corresponding elevation data, and according to the set aspect ratio, the obtained surface elevation data of the different profiles are converted into surface elevation profiles corresponding to the profiles.

[0017] Based on the geological map, the boundaries of different stratigraphic layers and as many occurrence elements as possible within the study area are marked on the corresponding positions on the surface elevation profile.

[0018] Based on the occurrence elements and the surface elevation data, a structural geological profile is compiled using structural geometry methods.

[0019] In one embodiment, the compilation of the geological profile map includes:

[0020] Based on the profile length and corresponding elevation data, and according to the set aspect ratio, the obtained surface elevation data of the different profiles are converted into surface elevation profiles corresponding to the profiles.

[0021] Based on the geological map, the geological corridor map of each profile location is cut out, and the stratigraphic boundaries and fault outcrops along the profile are marked on the surface profile; at the same time, as many occurrence elements as possible are also marked on the surface profile.

[0022] Based on the occurrence elements and stratigraphic exposure characteristics, and taking the stratigraphic thickness in the study area as the basis, a structural geological profile is compiled using structural geometry methods.

[0023] Continue to compile the cross-sections involved in the study area one by one.

[0024] In one embodiment, the burial depth data of the target layer at different locations in each profile includes:

[0025] Under the constraint of the regional stratigraphic thickness in the study area, the burial depth d of the target layer is obtained by the following formula;

[0026]

[0027] Where t is the true thickness of the overlying strata of the target layer, in meters, which is obtained by measuring and summing the true thicknesses of the overlying strata of the target layer according to the regional stratum thickness; α is the dip angle of the target layer, in degrees.

[0028] In one embodiment, the parameters include one or more of the following: the structural location of the study area, the structural style, the deformation intensity, the distance from the large-scale fault or the outcrop area of ​​the target layer, and the burial depth of the target layer.

[0029] According to one aspect of this application, one embodiment provides a device for obtaining shale gas preservation condition evaluation parameters, comprising:

[0030] The processing module, based on basic data including digital elevation data of the surface of the study area and geological maps, selects profile locations and projects the profile locations onto the geological maps. Among the selected profile locations, profiles that cut through different locations in the study area are reasonably selected.

[0031] The first module is used to read elevation data and compile geological profile maps;

[0032] The calculation module is used to calculate the burial depth data of the target layer at different locations in each profile.

[0033] The second module is used to compile a plan view of the target layer's burial depth; and

[0034] The acquisition module is used to acquire parameters for evaluating the shale gas preservation conditions in the study area based on the base maps, wherein the base maps include geological profile maps and / or target layer burial depth plan maps.

[0035] According to one aspect of this application, one embodiment provides an electronic device, including:

[0036] Memory; and

[0037] processor;

[0038] The memory is used to store one or more computer instructions; the one or more computer instructions are executed by the processor to implement the shale gas preservation condition evaluation parameter acquisition method as described above.

[0039] According to one aspect of this application, one embodiment provides a readable storage medium storing computer instructions; wherein, when the computer instructions are executed by a processor, they implement the shale gas preservation condition evaluation parameter acquisition method as described in any of the above claims.

[0040] The technical solution of the above embodiments of this application addresses the lack of drilling and seismic data in low-exploration areas. Based on surface digital elevation data and geological maps, it selects profiles at different locations within the study area and uses structural geometry methods to compile geological profile maps, determining the burial depth of the target layer. Based on the burial depth data of multiple profiles, it compiles a plan view of the target layer's burial depth. Using these resulting maps, it obtains parameters such as the structural location, structural style, deformation intensity, burial depth of the target layer, and distance to large through-faults or outcrops of the target layer in the study area. This technical solution offers high accuracy and can provide crucial support for evaluating shale gas preservation conditions in low-exploration areas; it is low-cost, does not rely on drilling and seismic data, and the required data is readily available; it has strong applicability and can be well applied to a wide range of low-exploration areas lacking drilling and seismic data. Attached Figure Description

[0041] Figure 1 This is a flowchart of a method for obtaining shale gas preservation condition evaluation parameters in one embodiment;

[0042] Figure 2 This is a flowchart illustrating a method for obtaining shale gas preservation condition evaluation parameters in one embodiment;

[0043] Figure 3 This is a schematic diagram of a method for obtaining shale gas preservation condition evaluation parameters in one embodiment;

[0044] Figure 4 This is a surface elevation map corresponding to the design profile of the central part of block X in one embodiment;

[0045] Figure 5 One embodiment is a structural geological profile of the central part of block X; stratigraphic codes in the figure: ∈-Cambrian, O1-Lower Ordovician, O 2-3 -Middle-Upper Ordovician, S1-Lower Silurian, S 2-3 - Middle-Upper Silurian, P-Permian, T-Triassic;

[0046] Figure 6 This is a contour map of the bottom burial depth of the Longmaxi Formation of the Silurian System in Block X, as described in one embodiment. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0049] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Moreover, in this application, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0051] Example 1

[0052] Please refer to Figure 1 , Figure 2 One embodiment provides a method for obtaining evaluation parameters of shale gas preservation conditions, including the following steps:

[0053] S1. Prepare basic data, which includes digital elevation data (DEM) and geological maps of the study area. Preparation can be carried out by collecting DEM data and geological maps of the study area; the geological maps provide the data basis for the later compilation of geological profile maps, preferably 1:200,000 geological maps.

[0054] S2. Based on the basic data and according to the needs of the work, select the profile location, in which the profiles that cut through different locations in the study area are reasonably selected, and the profile locations are projected onto the geological map.

[0055] In one embodiment of step S2, the criterion for reasonably selecting the cross section is to reveal the structural morphology and structural style as completely as possible.

[0056] S3. Read elevation data and compile geological profile maps.

[0057] Regarding the reading of elevation data, one embodiment includes the following: importing digital elevation data of the surface of the study area into software, and obtaining the corresponding surface elevation data for different profiles based on the coordinate information of the profile location described in step S2. The software used is professional software.

[0058] In one embodiment, the preparation of a geological profile map includes the following steps:

[0059] S311. Based on the profile length and corresponding elevation data, and according to the set aspect ratio, convert the obtained surface elevation data corresponding to the different profiles into surface elevation profiles corresponding to the profiles; that is, convert the surface elevation data obtained in the "read elevation data" step to obtain surface elevation profiles corresponding to the profiles. The preferred aspect ratio is 1:1.

[0060] S312. Carefully read the geological map and, based on the geological map, mark the boundaries of different stratigraphic layers and as many occurrence elements as possible within the study area onto the corresponding positions on the surface elevation profile. Corresponding to step S1, the geological map is the 1:200,000 geological map from step 1.

[0061] S313. Based on the occurrence elements and the surface elevation data, a structural geological profile is prepared using structural geometry methods.

[0062] S4. Calculate the burial depth data of the target layer at different locations on each profile. In one embodiment, step S4 includes the following: Under the constraint of the regional stratigraphic thickness within the study area, the burial depth d of the target layer is calculated using the following formula based on the overlying stratigraphic thickness and stratigraphic dip angle at different locations on each profile;

[0063]

[0064] Where t is the true thickness of the overlying strata of the target layer, in meters, which is obtained by measuring and summing the true thicknesses of the overlying strata of the target layer according to the regional stratum thickness; α is the dip angle of the target layer, in degrees.

[0065] S5. Compile a plan view of the target layer burial depth. Specifically, based on the burial depth data of the target layer at different locations on each profile calculated in step S4, use professional software to create a plan view to obtain a plan view of the target layer burial depth in the study area.

[0066] S6. Based on the basic maps, determine the parameters for evaluating the shale gas preservation conditions in the study area, wherein the basic maps include the geological profile map from step S3 and / or the target layer burial depth plan view from step S5. Understandably, the basic maps also include / involve the burial depth data from step S4.

[0067] In one embodiment, the parameters for evaluating shale gas preservation conditions involved in step S6 include one or more of the following: the structural location of the study area, structural style, deformation intensity, distance from a large through-fault or the outcrop area of ​​the target layer, and the burial depth of the target layer.

[0068] This technical solution proposes a method for obtaining shale gas preservation condition evaluation parameters. Based on fundamental geological data such as surface elevation and geological maps, it utilizes structural geological mapping methods to acquire these parameters in low-exploration-level areas. This method offers the following advantages: First, it is low-cost, as it does not rely on drilling and seismic data, and the required data is readily available. Second, it has strong applicability, being well-suited for vast areas with limited drilling and seismic data. Third, it boasts high accuracy, as the relevant parameters can be accurately determined using structural geometry methods based on accurate prior mapping.

[0069] Through case studies (one example detailed in Implementation Six), the target layer depth obtained using the shale gas preservation condition evaluation parameter acquisition method of this technical solution has an error rate of 2.6% compared to the data revealed by drilling. Therefore, this method can provide a fast and effective approach for obtaining shale gas preservation condition evaluation parameters in low-exploration areas.

[0070] Example 2

[0071] Please refer to Figure 1 , Figure 2 One embodiment provides a method for obtaining evaluation parameters of shale gas preservation conditions, including the following steps:

[0072] S1. Prepare basic data, including digital elevation data and geological maps of the study area.

[0073] S2. Based on the basic data, select the profile location, in which the profiles that cut through different locations in the study area are reasonably selected, and the profile locations are projected onto the geological map.

[0074] S3. Read elevation data and compile geological profile maps.

[0075] In one embodiment, the preparation of a geological profile map includes the following steps:

[0076] S321. Based on the profile length and corresponding elevation data, and according to a set aspect ratio, convert the obtained surface elevation data corresponding to the different profiles into surface elevation profiles corresponding to the profiles. Preferably, the set aspect ratio is 1:1.

[0077] S322. Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor map of each profile location, and mark the stratigraphic boundaries and fault outcrops along the profile on the surface profile; at the same time, mark as many occurrence elements as possible on the surface profile.

[0078] S323. Based on the occurrence elements and stratigraphic exposure characteristics, and taking the stratigraphic thickness in the study area as the basis, a structural geological profile is prepared using structural geometry methods.

[0079] S324. Continue to compile the cross-sections involved in the study area one by one.

[0080] S4. Calculate the burial depth data of the target layer at different locations in each profile.

[0081] S5. Prepare a plan view of the burial depth of the target layer.

[0082] S6. Parameter Determination: Using the results maps obtained in steps S3, S4, and S5, analyze the tectonic location and structural patterns of the study area, and determine key parameters such as stratigraphic attitude (to characterize deformation intensity), target layer depth, and distance from large-scale faults or target layer outcrops.

[0083] In this method for obtaining parameters for evaluating shale gas preservation conditions, the contents of steps S1, S2, S4, S5, and the "reading elevation data" step in step S3 can be found in Example 1.

[0084] Example 3

[0085] Please refer to Figure 3 One embodiment provides a device for obtaining evaluation parameters of shale gas preservation conditions, which adopts the following structure:

[0086] 1. Processing Module 10

[0087] The processing module 10 is used to select profile locations based on basic data including digital elevation data of the surface of the study area and geological maps, and to project the profile locations onto the geological maps. In the selection of profile locations, profiles that cut through different locations in the study area are reasonably selected.

[0088] 2. First Compilation Module 20

[0089] The first compilation module 20 is used to read elevation data and compile geological profile maps.

[0090] 3. Calculation Module 30

[0091] The calculation module 30 is used to calculate the burial depth data of the target layer at different locations in each profile.

[0092] 4. Second compilation module 40

[0093] The second compilation module 40 is used to compile a plan view of the burial depth of the target layer.

[0094] 5. Find module 50

[0095] The acquisition module 50 is used to acquire parameters for evaluating the shale gas preservation conditions in the study area based on the base maps, wherein the base maps include geological profile maps and / or target layer burial depth plan maps.

[0096] In one embodiment, the second compilation module 40 compiles the geological profile map using the following steps:

[0097] S311. Based on the profile length and corresponding elevation data, and according to the set aspect ratio, convert the obtained surface elevation data corresponding to the different profiles into surface elevation profiles corresponding to the profiles; that is, convert the surface elevation data obtained in the "read elevation data" step to obtain surface elevation profiles corresponding to the profiles. The preferred aspect ratio is 1:1.

[0098] S312. Carefully read the geological map and, based on the geological map, mark the boundaries of different stratigraphic layers and as many occurrence elements as possible within the study area onto the corresponding positions on the surface elevation profile. Corresponding to step S1, the geological map is the 1:200,000 geological map from step 1.

[0099] S313. Based on the occurrence elements and the surface elevation data, a structural geological profile is prepared using structural geometry methods.

[0100] In one embodiment, the second compilation module 40 may further compile the geological profile map using the following steps:

[0101] S321. Based on the profile length and corresponding elevation data, and according to a set aspect ratio, convert the obtained surface elevation data corresponding to the different profiles into surface elevation profiles corresponding to the profiles. Preferably, the set aspect ratio is 1:1.

[0102] S322. Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor map of each profile location, and mark the stratigraphic boundaries and fault outcrops along the profile on the surface profile; at the same time, mark as many occurrence elements as possible on the surface profile.

[0103] S323. Based on the occurrence elements and stratigraphic exposure characteristics, and taking the stratigraphic thickness in the study area as the basis, a structural geological profile is prepared using structural geometry methods.

[0104] S324. Continue to compile the cross-sections involved in the study area one by one.

[0105] In one embodiment, the shale gas preservation condition evaluation parameter acquisition device further includes a preparation module 00, which is used to prepare basic geological data.

[0106] It should be noted that the above-mentioned shale gas preservation condition evaluation parameter acquisition device is used to implement the shale gas preservation condition evaluation parameter acquisition method in the above embodiments, and each module in the device corresponds to each step in the method.

[0107] Example 4

[0108] Based on the same inventive concept, one embodiment of this application provides an electronic device, including: a memory and a processor; wherein, the memory is used to store one or more computer instructions; the one or more computer instructions are executed by the processor using the shale gas preservation condition evaluation parameter acquisition method described in any of the above embodiments.

[0109] Example 5

[0110] Based on the same inventive concept, one embodiment of this application provides a readable storage medium storing computer instructions; wherein, when the computer instructions are executed by a processor, the shale gas preservation condition evaluation parameter acquisition method described in any of the above embodiments is implemented.

[0111] One or more of the aforementioned computer instructions can form a program.

[0112] The aforementioned program can run on a processor or be stored in memory (or a computer-readable medium). Computer-readable media includes both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0113] These computer programs may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes can be implemented using different modules, and different steps can be implemented using different modules.

[0114] The shale gas preservation condition evaluation parameter acquisition methods in Examples 4 and 5 are designed to address the current situation of lacking drilling and seismic data in low-exploration areas. In one embodiment, the method includes the following steps:

[0115] 1. Collect surface digital elevation data and regional geological maps of the study area;

[0116] 2. Following the principle of revealing the tectonic morphology and style as completely as possible, select appropriate sections that cut through different locations in the study area and project the section locations onto the geological map;

[0117] 3. Import the digital elevation data of the surface of the study area into professional software, and obtain the corresponding surface elevation data of different profiles based on the coordinate information of the profile location;

[0118] 4. Based on surface occurrence elements and elevation data, combined with the exposure of stratigraphic boundaries and faults, structural geometry methods are used to compile structural geological profiles;

[0119] 5. Under the constraint of the regional stratigraphic thickness in the study area, based on the prepared geological profile, the burial depth of the target layer at different locations on each profile is determined using geometric methods;

[0120] 6. Based on the calculated burial depth data of the target layer at different locations on each profile, a planar map is created to obtain a planar map of the burial depth of the target layer in the study area;

[0121] 7. Based on the compiled basic maps, determine the key parameters for evaluating the shale gas preservation conditions in the study area.

[0122] Example 6

[0123] Please refer to Figures 4-6 One embodiment provides a set of technical solutions involving a method, apparatus, electronic device and readable storage medium for obtaining shale gas preservation condition evaluation parameters. The following is illustrated through a case study to further understand its technical content.

[0124] The following detailed explanation uses the X low-exploration-level area in Guizhou as an example, illustrating the application of methods, devices, electronic equipment, and readable storage media for obtaining shale gas preservation condition evaluation parameters. The specific steps are as follows:

[0125] 1. The system collects basic geological data such as digital elevation and 1:200,000 regional geological maps of the low exploration level area and adjacent areas.

[0126] 2. Design a structural geological profile for the low exploration level area.

[0127] (1) Read the 1:200,000 geological map of the study area in detail to preliminarily clarify the tectonic development characteristics and the initial exposure of strata in the study area;

[0128] (2) Based on the principle of revealing the structural morphology and style as completely as possible, the sections cut through different locations in the study area should be selected reasonably according to a certain density so as to control the main structural units in the study area.

[0129] (3) Use relevant professional software to read the coordinate information of the relevant profiles and project the profile positions onto the geological map.

[0130] 3. Import the digital elevation data of the surface of the study area into professional software, and obtain the surface elevation data corresponding to different profiles based on the coordinate information of each profile obtained in step 2.

[0131] 4. Compile the structural geological profile of the study area. This can be divided into the following steps:

[0132] (1) Based on the profile length and corresponding elevation data, and according to a 1:1 aspect ratio, the surface elevation data obtained in step 3 is converted into a surface elevation profile corresponding to the profile. Figure 4 );

[0133] (2) Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor map of each profile location, and mark the outcrop locations of the stratigraphic boundaries, faults, etc. that the profile passes through on the surface profile; at the same time, mark as many occurrence elements as possible on the surface profile.

[0134] (3) Based on the occurrence elements and stratigraphic exposure characteristics, and taking the stratigraphic thickness in the study area as the basis, a structural geological profile is prepared using structural geometry methods. Figure 5 );

[0135] (4) Following the above method, compile the designed profiles in the study area one by one.

[0136] 5. Calculate the burial depth of the target layer. Based on the structural geological profile with a cross-sectional ratio of 1:1 obtained in step 4, use geometric methods to obtain the burial depth data of the target layer (Lower Silurian S1) at different locations on each profile in the study area.

[0137] 6. Generate contour maps of the target layer's burial depth within the study area. Based on the burial depth data of the target layer at different locations on each profile calculated in step 5, use specialized software to create a planar map, obtaining the contour maps of the Lower Silurian Longmaxi Formation's burial depth within the study area. Figure 6 ).

[0138] 7. Analyze and obtain key parameters for evaluating shale gas preservation conditions in the study area.

[0139] According to the structural geological profile ( Figure 5 ) and contour map of the target layer burial depth ( Figure 6 By simple calculations, the burial depth data of the target layer at different locations can be obtained. The burial depth of the bottom of the Longmaxi Formation, the target layer in the study area, is the largest, approximately 1600m. Through the analysis of the structural geological profile, the structural location of the study area (core of anticline / syncline, slope area, etc.) and structural style (wide and gentle synclines, tightly closed anticlines, which together form a barrier fold combination) can be obtained. The stratigraphic attitude can also be approximately measured to characterize the stratigraphic deformation intensity. Combined with the location of large-scale faults and the outcrop of strata, parameters such as the distance between the target layer and the stratigraphic layer can be calculated.

[0140] Based on regional surface geology and elevation data, this embodiment uses the basic principles and methods of structural geology to obtain evaluation parameters for shale gas preservation conditions in the low-exploration-level area of ​​Guizhou X by compiling structural geological profiles and conducting planar mapping, thus guiding the selection and evaluation of potential sites.

[0141] In summary, this method was applied to determine shale gas preservation condition evaluation parameters in the X low-exploration area of ​​Guizhou Province. The obtained parameters included the structural location of the study area, the developed structural style, the depth of the target layer, the formation deformation intensity, and the distance to the Tongtian Fault and outcrop areas. Validation with drilling data from adjacent areas demonstrated the high accuracy of this method, providing important support for evaluating shale gas preservation conditions in low-exploration areas.

[0142] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for obtaining evaluation parameters of shale gas preservation conditions, characterized in that, include: Based on basic data including digital elevation data of the surface of the study area and geological maps, profile locations are selected and projected onto the geological maps. Among the selected profile locations, profiles that cut through different locations in the study area are reasonably chosen. Reading elevation data and compiling geological profile maps; wherein, reading elevation data includes importing surface digital elevation data of the study area into software, and obtaining corresponding surface elevation data for different profiles based on the coordinate information of the profile location; compiling geological profile maps includes: Based on the profile length and corresponding elevation data, and according to a set aspect ratio, the obtained surface elevation data for different profiles are converted into surface elevation profiles corresponding to the profiles; based on the geological map, the boundaries of different stratigraphic units and as many attitude elements as possible within the study area are marked on the corresponding positions of the surface elevation profiles; based on the attitude elements and the surface elevation data, structural geometry methods are used to compile structural geological profiles; or, based on the profile length and corresponding elevation data, and according to a set aspect ratio, the obtained surface elevation data are converted into surface elevation profiles. The surface elevation data corresponding to the different profiles are converted into surface elevation profiles corresponding to the profiles; based on the geological map, geological corridor maps of the locations of each profile are cut out, and the stratigraphic boundaries and fault outcrops along the profiles are marked on the surface profiles; at the same time, as many attitude elements as possible are also marked on the surface profiles; based on the attitude elements and stratigraphic outcrop characteristics, and taking the stratigraphic thickness in the study area as the basis, structural geological profiles are compiled using structural geometry methods; the profiles involved in the study area are then compiled one by one. Calculate the burial depth data of the target layer at different locations in each profile; Prepare a plan view of the burial depth of the target layer; Based on the basic maps, parameters for evaluating the shale gas preservation conditions in the study area are obtained, wherein the basic maps include geological profile maps and / or target layer burial depth plan maps.

2. The method for obtaining evaluation parameters of shale gas preservation conditions according to claim 1, characterized in that, The criterion for selecting the cross section is to reveal the structural morphology and style as completely as possible.

3. The method for obtaining evaluation parameters of shale gas preservation conditions according to claim 1, characterized in that, The burial depth data of the target layer at different locations in each profile include: Under the constraint of the regional stratigraphic thickness in the study area, the burial depth d of the target layer is obtained by the following formula; Where t is the true thickness of the overlying strata of the target layer, in meters, which is obtained by measuring and summing the true thicknesses of the overlying strata of the target layer according to the regional stratum thickness; α is the dip angle of the target layer, in degrees.

4. The method for obtaining evaluation parameters of shale gas preservation conditions according to claim 1, characterized in that, The parameters include one or more of the following: the structural location of the study area, the structural style, the deformation intensity, the distance from the large-scale fault or the outcrop area of ​​the target layer, and the burial depth of the target layer.

5. A device for obtaining parameters for evaluating shale gas preservation conditions, characterized in that, The device employs the shale gas preservation condition evaluation parameter acquisition method described in any one of claims 1 to 4, including: The processing module is used to select profile locations based on basic data including digital elevation data of the surface of the study area and geological maps, and to project the profile locations onto the geological maps. In the selection of profile locations, profiles that cut through different locations in the study area are reasonably selected. The first module is used to read elevation data and compile geological profile maps; The calculation module is used to calculate the burial depth data of the target layer at different locations in each profile. The second module is used to compile a plan view of the target layer's burial depth; and The acquisition module is used to acquire parameters for evaluating the shale gas preservation conditions in the study area based on the base maps, wherein the base maps include geological profile maps and / or target layer burial depth plan maps.

6. An electronic device, characterized in that, include: Memory; and processor; The memory is used to store one or more computer instructions; the one or more computer instructions are executed by the processor to implement the shale gas preservation condition evaluation parameter acquisition method according to any one of claims 1 to 4.

7. A readable storage medium, characterized in that, The readable storage medium stores computer instructions; wherein, when the computer instructions are executed by a processor, they implement the method for obtaining shale gas preservation condition evaluation parameters as described in any one of claims 1 to 4.

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