Shale gas storage condition evaluation parameter acquisition method and device and electronic equipment

Abstract

The invention relates to the technical field of unconventional oil-gas exploration, and discloses a shale gas preservation condition evaluation parameter obtaining method and device and electronic equipment. The method comprises the following steps: selecting a profile position; compiling a geological profile map; calculating burial depth data of the target layer at different positions of each section; compiling a target layer burial depth plane graph; and calculating parameters of shale gas preservation condition evaluation in the research area. According to the device, a processing module is used for selecting a profile position; the calculation module is used for calculating burial depth data of a target layer at different positions of each section; the second compiling module is used for compiling a target layer burial depth plane graph; and the solving module is used for solving parameters of shale gas preservation condition evaluation of the research area. According to the technical scheme, the accuracy is high, and important support can be provided for evaluation of the shale gas storage conditions in the low-exploration-degree area; the cost is low, the method does not depend on drilling and seismic data, and the required data are easy to obtain; and the method is high in applicability and can be well suitable for wide low-exploration-degree areas lacking well drilling and seismic data.

Description

Technical Field

[0001] The present invention relates to the technical field of unconventional oil and gas exploration, and in particular to a method, device and electronic equipment for obtaining shale gas preservation condition evaluation parameters, which can be used to obtain shale gas preservation condition evaluation parameters in low exploration degree areas. Background Art

[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 an important determinant of shale gas enrichment and high yield. The preservation condition evaluation indicators mainly include regional cap rock conditions, target layer burial depth, structural style, structural position, deformation intensity, fault / crack development degree, uplift and erosion, etc. Exploration practice shows that structural preservation conditions are the top priority in the study of shale gas preservation conditions. At present, shale gas exploration and development have achieved good results, but exploration research as a whole still needs to continue to develop, especially the study of shale gas preservation conditions.

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

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

[0005] The present application provides a method, device and electronic device for obtaining evaluation parameters of shale gas preservation conditions to solve the above-mentioned technical problem that it is difficult to obtain key evaluation parameters of shale gas preservation conditions in the prior art.

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

[0007] Based on basic data including surface digital elevation data and geological maps of the study area, a section position is selected, and the section position is projected onto the geological map, wherein in the selected section position, sections cutting through different positions of the study area are reasonably selected;

[0008] Read elevation data and compile geological profiles;

[0009] Calculate the buried depth data of the target layer at different positions in each section;

[0010] Prepare the target layer burial depth plan;

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

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

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

[0014] The surface digital elevation data of the study area is imported into the software, and the corresponding surface elevation data of different sections are obtained according to the coordinate information of the section position.

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

[0016] According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile;

[0017] Based on the geological map, the boundaries of different strata and as many occurrence elements as possible in the study area are marked at corresponding positions on the surface elevation profile;

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

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

[0020] According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile;

[0021] Based on the geological map, a geological corridor map of each section is cut out, and the exposed positions of the stratigraphic boundaries and faults passed by the section are marked on the surface section; at the same time, as many occurrence elements as possible are also marked on the surface section;

[0022] According to the occurrence factors and the outcrop characteristics of the strata, based on the thickness of the strata in the study area, the structural geological profile is compiled using the structural geometry method;

[0023] Continue to compile the profiles involved in the study area one by one.

[0024] In one embodiment, the calculation of the buried depth data of the target layer at different positions of each section includes:

[0025] Under the constraint of the thickness of the regional strata in the study area, the buried depth d of the target layer is calculated by the following formula;

[0026]

[0027] Wherein, t is the true thickness of the overlying strata of the target layer, m, which is obtained by measuring the true thickness of the overlying strata of the target layer respectively and summing them according to the regional stratum thickness; α is the inclination angle of the target layer, °.

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

[0029] According to one aspect of the present application, an embodiment provides a shale gas preservation condition evaluation parameter acquisition device, comprising:

[0030] A processing module selects a section position based on basic data including surface digital elevation data and a geological map of the study area, and projects the section position onto the geological map, wherein the sections cutting through different positions of the study area are reasonably selected in the selected section position;

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

[0032] A calculation module is used to calculate the buried depth data of the target layer at different positions of each section;

[0033] The second compilation module is used to compile a target layer burial depth plan; and

[0034] The obtaining module is used to obtain parameters for evaluating shale gas preservation conditions in the study area based on basic maps, wherein the basic maps include geological profiles and / or target layer burial depth plane maps.

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

[0036] Memory; and

[0037] processor;

[0038] Wherein, 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 in any one of the above.

[0039] According to one aspect of the present application, an embodiment provides a readable storage medium having computer instructions stored thereon; wherein, when the computer instructions are executed by a processor, a method for obtaining shale gas preservation condition evaluation parameters as described in any one of the above items is implemented.

[0040] The technical solution of the above embodiment of the present application, in view of the lack of drilling and seismic data in low-exploration areas, is based on surface digital elevation data and geological maps, and sections at different locations in the study area are selected. The tectonic geometry method is used to compile geological profiles to obtain the profile burial depth of the target layer; based on the burial depth data of multiple profiles, a burial depth plane map of the target layer is compiled; using these result maps, parameters such as the structural position, structural style, deformation intensity, burial depth of the target layer, and distance from large-scale Tongtian faults or target layer outcrop areas in the study area are obtained. This technical solution has high accuracy and can provide important support for the evaluation of 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 easy to obtain; it has strong applicability and can be well applied to the vast number of low-exploration areas that lack drilling and seismic data. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flow chart of a method for obtaining shale gas preservation condition evaluation parameters in an embodiment;

[0042] Figure 2 is a flow chart of a method for obtaining shale gas preservation condition evaluation parameters in an embodiment;

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

[0044] Figure 4 is a surface elevation map corresponding to a designed section in the middle of block X in an embodiment;

[0045] Figure 5 is a structural geological profile through the middle of Block X in an embodiment; the stratum codes in the figure are: ∈-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 The bottom burial depth contour map of the Longmaxi Formation of the Silurian System in Block X in an embodiment is shown. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] In order 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0049] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[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. 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 through a third element.

[0051] Embodiment 1

[0052] Please refer to Figure 1 , Figure 2 An embodiment provides a method for obtaining shale gas preservation condition evaluation parameters, comprising the following steps:

[0053] S1. Prepare basic data, including surface digital elevation data and geological maps of the study area. The preparation work can be done in the following ways: collect surface digital elevation (DEM) data and geological maps in the study area; the geological map provides the data basis for the later compilation of geological profiles, preferably a 1:200,000 geological map.

[0054] S2. Based on the basic data and according to the work needs, select the section location, among which, reasonably select the sections that cut through different locations of the study area, and project the section location 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 profiles.

[0057] Regarding reading elevation data, in one embodiment, it includes the following: importing the surface digital elevation data of the study area into the software, and obtaining the surface elevation data corresponding to different sections according to the coordinate information of the section position in step S2. The software is professional software.

[0058] Regarding the preparation of a geological profile, in one embodiment, it includes the following steps:

[0059] S311. According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the surface elevation data corresponding to the different profiles obtained are converted into a surface elevation profile corresponding to the profile; that is, the surface elevation data obtained in the "reading elevation data" step is converted to obtain a surface elevation profile corresponding to the profile. The set aspect ratio is preferably 1:1.

[0060] S312. Read the geological map in detail, and based on the geological map, mark the boundaries of different strata in the study area and as many occurrence elements as possible to the corresponding positions on the surface elevation profile. Wherein, corresponding to step S1, the geological map is the 1:200,000 geological map in step 1.

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

[0062] S4. Calculate the burial depth data of the target layer at different positions of each profile. In one embodiment, step S4 includes the following contents: Under the constraint of the regional stratum thickness in the study area, according to the overlying stratum thickness and stratum dip angle of the target layer at different positions on each profile, the burial depth d of the target layer is calculated by the following formula;

[0063]

[0064] Wherein, t is the true thickness of the overlying strata of the target layer, m, which is obtained by measuring the true thickness of the overlying strata of the target layer respectively and summing them according to the regional stratum thickness; α is the inclination angle of the target layer, °.

[0065] S5. Prepare a plan view of the buried depth of the target layer. Specifically, according to the buried depth data of the target layer at different positions on each section calculated in step S4, a plan view is drawn using professional software to obtain a plan view of the buried depth of the target layer in the study area.

[0066] S6. Based on the basic map, obtain the parameters for evaluating the preservation conditions of shale gas in the study area, wherein the basic map includes the geological profile of step S3 and / or the target layer burial depth plan of step S5. It is understandable that the basic map also includes / involves the burial depth data of step S4.

[0067] Among them, regarding the parameters for evaluating shale gas preservation conditions involved in this step S6, in one embodiment, the parameters include one or more of the structural position of the study area, structural style, deformation intensity, distance from a large-scale fault or outcrop area of ​​the target layer, and burial depth of the target layer.

[0068] The method for obtaining shale gas preservation condition evaluation parameters of this technical solution uses structural geological mapping methods based on basic geological data such as surface elevation and geological maps to obtain shale gas preservation condition evaluation parameters in low-exploration areas. This method has the following advantages: First, low cost. This method does not rely on drilling and seismic data, and the required data is easy to obtain; second, strong applicability, and can be well applied to the vast number of low-exploration areas that lack drilling and seismic data; third, high accuracy. On the basis of accurate mapping in the early stage, the structural geometry method can be used to accurately obtain relevant parameters.

[0069] Through example verification (one of which is detailed in Example 6), the error rate of the target layer burial depth obtained by the shale gas preservation condition evaluation parameter acquisition method of the technical solution is 2.6% compared with the data revealed by drilling. Therefore, this method can provide a fast and effective way to obtain shale gas preservation condition evaluation parameters in low exploration degree areas.

[0070] Embodiment 2

[0071] Please refer to Figure 1 , Figure 2 An embodiment provides a method for obtaining shale gas preservation condition evaluation parameters, comprising the following steps:

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

[0073] S2. Based on the basic data, select the section location, where sections that cut through different locations of the study area are reasonably selected and the section locations are projected onto the geological map.

[0074] S3. Read elevation data and compile geological profiles.

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

[0076] S321. According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile. The set aspect ratio is preferably 1:1.

[0077] S322. Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor maps of the locations of each section based on the geological map, and mark the stratigraphic boundaries and fault exposure positions passed by the section on the surface section; at the same time, mark as many occurrence elements as possible on the surface section.

[0078] S323. According to the occurrence factors and stratigraphic exposure characteristics, based on the stratigraphic thickness in the study area, the structural geological profile is compiled using structural geometry methods.

[0079] S324. Continue to compile the profiles involved in the study area one by one.

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

[0081] S5. Prepare a plan of the target layer’s buried depth.

[0082] S6. Obtaining parameters: Using the result maps obtained in steps S3, S4, and S5, analyze the structural position of the study area, the developed structural style, and obtain key parameters such as the stratigraphic attitude (used to characterize the deformation intensity), the burial depth of the target layer, and the distance from the large-scale Tongtian fault or the outcrop area of ​​the target layer.

[0083] In the method for obtaining shale gas preservation condition evaluation parameters, the contents of steps S1, S2, S4, S5 and the step of "reading elevation data" in step S3 may refer to the first embodiment.

[0084] Embodiment 3

[0085] Please refer to Figure 3 An embodiment provides a shale gas preservation condition evaluation parameter acquisition device, which adopts the following structure:

[0086] 1. Processing module 10

[0087] The processing module 10 is used to select the section position based on basic data including surface digital elevation data and geological map of the study area, and project the section position onto the geological map, wherein the sections cutting through different positions of the study area are reasonably selected in the selected section position.

[0088] 2. First compilation module 20

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

[0090] 3. Computing module 30

[0091] The calculation module 30 is used to calculate the buried depth data of the target layer at different positions of each section.

[0092] 4. Second compilation module 40

[0093] The second compilation module 40 is used to compile a target layer buried depth plan map.

[0094] 5. Obtain module 50

[0095] The obtaining module 50 is used to obtain parameters for evaluating shale gas preservation conditions in the study area based on basic maps, wherein the basic maps include geological profiles and / or target layer burial depth plane maps.

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

[0097] S311. According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the surface elevation data corresponding to the different profiles obtained are converted into a surface elevation profile corresponding to the profile; that is, the surface elevation data obtained in the "reading elevation data" step is converted to obtain a surface elevation profile corresponding to the profile. The set aspect ratio is preferably 1:1.

[0098] S312. Read the geological map in detail, and based on the geological map, mark the boundaries of different strata in the study area and as many occurrence elements as possible at corresponding positions on the surface elevation profile. Wherein, corresponding to step S1, the geological map is the 1:200,000 geological map in step 1.

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

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

[0101] S321. According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile. The set aspect ratio is preferably 1:1.

[0102] S322. Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor maps of the locations of each section based on the geological map, and mark the stratigraphic boundaries and fault exposure positions passed by the section on the surface section; at the same time, mark as many occurrence elements as possible on the surface section.

[0103] S323. According to the occurrence factors and stratigraphic exposure characteristics, based on the stratigraphic thickness in the study area, the structural geological profile is compiled using structural geometry methods.

[0104] S324. Continue to compile the profiles 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, and the preparation module 00 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-mentioned embodiments, and each module in the device corresponds to each step in the method.

[0107] Embodiment 4

[0108] Based on the same inventive concept, an embodiment of the present application provides an electronic device, comprising: 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 to obtain the shale gas preservation condition evaluation parameter method described in any one of the above embodiments.

[0109] Embodiment 5

[0110] Based on the same inventive concept, an embodiment of the present application provides a readable storage medium, on which computer instructions are stored; wherein, when the computer instructions are executed by a processor, the method for obtaining shale gas preservation condition evaluation parameters described in any one of the above embodiments is implemented.

[0111] Among them, the above one or more computer instructions can be formed into a program.

[0112] The above program can be run in the processor, or it can be stored in the memory (or computer-readable medium), which includes permanent and non-permanent, removable and non-removable media. 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 technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined in this article, computer-readable media does not include transitory computer-readable media (transit media), such as modulated data signals and carrier waves.

[0113] These computer programs can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one or more blocks can be implemented by different modules corresponding to different steps.

[0114] The method for obtaining shale gas preservation condition evaluation parameters in the fourth and fifth embodiments is designed for the current situation of lack of 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 in the study area;

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

[0117] 3. Import the surface digital elevation data of the study area into professional software, and obtain the corresponding surface elevation data of different sections according to the coordinate information of the section position;

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

[0119] 5. Under the constraint of the thickness of the regional strata in the study area, based on the compiled geological profile, the depth of the target layer at different positions on each profile is calculated using geometric methods;

[0120] 6. Based on the calculated burial depth data of the target layer at different positions on each section, a plan map is drawn to obtain a burial depth plan map of the target layer in the study area;

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

[0122] Embodiment 6

[0123] Please refer to Figure 4-Figure 6 An embodiment provides a set of technical solutions involving a method, device, electronic device and readable storage medium for obtaining shale gas preservation condition evaluation parameters. The following is an explanation through a case to facilitate further understanding of its technical content.

[0124] The following is a detailed description of the Guizhou X low exploration area as an example, which applies the shale gas preservation condition evaluation parameter acquisition method, device, electronic device and readable storage medium. The specific steps are as follows:

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

[0126] 2. Design the structural geological profile of the low-exploration area.

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

[0128] (2) Based on the principle of revealing the structural morphology and structural style as completely as possible, sections cutting through different locations in the study area are reasonably selected 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 relevant section coordinate information and project the section position onto the geological map.

[0130] 3. Import the digital elevation data 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. Prepare the structural geological profile of the study area. This can be divided into the following steps:

[0132] (1) According to the profile length and the corresponding elevation data, the surface elevation data obtained in step 3 is converted into a surface elevation profile corresponding to the profile in accordance with an aspect ratio of 1:1 ( Figure 4 );

[0133] (2) Based on a detailed reading of the regional geological map of the study area, cut out the geological corridor map where each section is located, and mark the exposed positions of the stratigraphic boundaries and faults that the section passes through on the surface section; at the same time, mark as many occurrence elements as possible on the surface section;

[0134] (3) According to the occurrence factors and the characteristics of the strata exposed, based on the thickness of the strata in the study area, the structural geological profile is compiled using the structural geometry method ( Figure 5 );

[0135] (4) According to the above method, the designed profiles in the study area are compiled one by one.

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

[0137] 6. Generate the depth contour map of the target layer in the study area. According to the depth data of the target layer at different positions on each section calculated in step 5, use professional software to make a plane map and obtain the depth contour map of the Longmaxi Formation of the Lower Silurian in the study area ( Figure 6 ).

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

[0139] According to the structural geological section ( Figure 5 ) and target layer burial depth contour map ( Figure 6 ), through simple calculation, the burial depth data of the target layer at different positions can be obtained. The maximum burial depth of the bottom of the Longmaxi Formation, the target layer in the study area, is about 1600m. Through the analysis of the structural geological profile, the structural position (anticline / syncline core, slope area, etc.) and structural style (wide and gentle syncline, closed anticline, and the two constitute a barrier fold combination) of the study area can be obtained. The occurrence of the stratum can also be approximately measured to characterize the deformation intensity of the stratum. Combined with the outcrop position of the large-scale Tongtian fault and the stratum, the distance between the target layer and it and other parameters can be calculated.

[0140] Based on regional surface geological and elevation data, this embodiment uses the basic principles and methods of structural geology to compile structural geological profiles and carry out plane mapping to obtain evaluation parameters for shale gas preservation conditions in Guizhou's X low-exploration area to guide area selection evaluation.

[0141] In general, this method was used to obtain the evaluation parameters of shale gas preservation conditions in the low exploration area of ​​Guizhou Province, and the parameters including the structural position of the study area, the developed structural style, the buried depth of the target layer, the formation deformation intensity, the distance from the Tongtian Fault and the outcrop area were obtained. The method was verified by the drilling data of the neighboring area, and it has high accuracy, which can provide important support for the evaluation of shale gas preservation conditions in low exploration areas.

[0142] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for obtaining shale gas preservation condition evaluation parameters, characterized in that: include: Based on basic data including surface digital elevation data and geological maps of the study area, a section position is selected, and the section position is projected onto the geological map, wherein in the selected section position, sections cutting through different positions of the study area are reasonably selected; Read elevation data and compile geological profiles; Calculate the buried depth data of the target layer at different positions in each section; Prepare the target layer burial depth plan; Based on basic maps, parameters for evaluating shale gas preservation conditions in the study area are obtained, wherein the basic maps include geological profiles and / or target layer burial depth plane maps.

2. A method for obtaining shale gas preservation condition evaluation parameters according to claim 1, characterized in that: The criterion for rationally selecting the sections is to reveal the structural morphology and structural style as completely as possible.

3. A method for obtaining shale gas preservation condition evaluation parameters according to claim 1, characterized in that: The reading of elevation data comprises: The surface digital elevation data of the study area is imported into the software, and the corresponding surface elevation data of different sections are obtained according to the coordinate information of the section position.

4. A method for obtaining shale gas preservation condition evaluation parameters according to claim 3, characterized in that: The preparation of the geological profile includes: According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile; Based on the geological map, the boundaries of different strata and as many occurrence elements as possible in the study area are marked at corresponding positions on the surface elevation profile; According to the occurrence elements and the surface elevation data, a structural geological profile is compiled using structural geometry methods.

5. A method for obtaining shale gas preservation condition evaluation parameters according to claim 3, characterized in that: The preparation of the geological profile includes: According to the profile length and the corresponding elevation data, and in accordance with the set aspect ratio, the acquired surface elevation data corresponding to the different profiles are converted into a surface elevation profile corresponding to the profile; Based on the geological map, a geological corridor map of each section is cut out, and the exposed positions of the stratigraphic boundaries and faults passed by the section are marked on the surface section; at the same time, as many occurrence elements as possible are also marked on the surface section; According to the occurrence factors and the outcrop characteristics of the strata, based on the thickness of the strata in the study area, the structural geological profile is compiled using the structural geometry method; Continue to compile the profiles involved in the study area one by one.

6. A method for obtaining shale gas preservation condition evaluation parameters according to claim 1, characterized in that: The calculation of the buried depth data of the target layer at different positions of each section includes: Under the constraint of the thickness of the regional strata in the study area, the buried depth d of the target layer is calculated by the following formula; Wherein, t is the true thickness of the overlying strata of the target layer, m, which is obtained by measuring the true thickness of the overlying strata of the target layer respectively and summing them according to the regional stratum thickness; α is the inclination angle of the target layer, °.

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

8. A shale gas preservation condition evaluation parameter acquisition device, characterized in that: include: A processing module is used to select a section position based on basic data including surface digital elevation data and a geological map of the study area, and project the section position onto the geological map, wherein the sections cutting through different positions of the study area are reasonably selected in the selected section position; The first compilation module is used to read the elevation data and compile the geological profile; A calculation module is used to calculate the buried depth data of the target layer at different positions of each section; The second compilation module is used to compile a target layer burial depth plan; and The obtaining module is used to obtain parameters for evaluating shale gas preservation conditions in the study area based on basic maps, wherein the basic maps include geological profiles and / or target layer burial depth plane maps.

9. An electronic device, characterized in that: include: Memory; and processor; Wherein, 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 described in any one of claims 1 to 7.

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

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