Method and device for evaluating a shale gas favorable zone

Abstract

This application provides a method and apparatus for evaluating favorable shale gas areas. The method includes: acquiring geological and engineering parameters of the area to be evaluated; performing paleogeomorphological analysis on the area to be evaluated based on the engineering parameters to obtain corresponding paleogeomorphological analysis results; performing preservation condition analysis on the geological and engineering parameters to obtain corresponding preservation condition analysis results; quantifying the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assigning pre-set weights to multiple parameter types to construct a quantitative evaluation model; and obtaining the corresponding quantitative evaluation results of favorable shale gas areas through the quantitative evaluation model. This comprehensively and accurately reflects the actual occurrence of shale gas reservoirs, effectively reducing blind exploration and significantly lowering exploration risks.

Description

Technical Field

[0001] This invention relates to the fields of energy geology and resource assessment, and in particular to a method and apparatus for evaluating favorable shale gas areas. Background Technology

[0002] Shale gas, as an unconventional natural gas resource, has become an important direction for global energy development due to its enormous resource potential and wide distribution. However, the formation mechanism of shale gas reservoirs is complex, and exploration requires comprehensive consideration of various geological factors, such as the physical properties of shale reservoirs, the influence of paleogeography on the sedimentary environment, and preservation conditions. Traditional single-parameter evaluation methods are insufficient to comprehensively and accurately predict favorable shale gas areas, resulting in a low exploration success rate.

[0003] Currently, shale gas exploration focuses primarily on the analysis of single or a few parameters, such as shale reservoir thickness, total organic carbon (TOC) content, and gas content. While these parameters are closely related to shale gas enrichment, they neglect the influence of crucial factors such as paleogeography, tectonic deformation, and caprock sealing. Single-parameter evaluation methods suffer from limitations in scope, accuracy, and application, failing to fully reflect the complex accumulation conditions of shale gas and leading to significant uncertainty in the evaluation results.

[0004] To improve the success rate and accuracy of shale gas exploration and evaluation, a more comprehensive and holistic evaluation method must be introduced to enhance the accuracy of shale gas favorable area evaluation and the success rate of exploration. Summary of the Invention

[0005] This invention provides a method and apparatus for evaluating favorable shale gas areas, which can improve the accuracy of shale gas favorable area evaluation and exploration success rate.

[0006] In a first aspect, the present invention provides a method for evaluating favorable shale gas areas, comprising:

[0007] Obtain the geological and engineering parameters of the area to be evaluated;

[0008] Based on the engineering parameters, paleogeomorphological analysis is performed on the area to be evaluated to obtain the corresponding paleogeomorphological analysis results.

[0009] Based on the geological parameters and the engineering parameters, a preservation condition analysis was performed to obtain the corresponding preservation condition analysis results.

[0010] The geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results are quantified, and multiple preset parameter type weights are assigned to construct a quantitative evaluation model.

[0011] The quantitative evaluation model is used to obtain the corresponding quantitative evaluation results of shale gas favorable areas.

[0012] Optionally, after obtaining the quantitative evaluation results of the corresponding shale gas favorable areas through the quantitative evaluation model, the method further includes:

[0013] The quantitative evaluation results were then verified.

[0014] Optionally, the quantitative evaluation results are verified, including:

[0015] Based on the quantitative evaluation results of the shale gas favorable areas, the area to be evaluated is divided into multiple shale gas favorable areas of different levels.

[0016] In the area to be evaluated, on-site drilling verification was carried out based on the shale gas favorable areas of different grades;

[0017] Based on the verification results, determine whether the quantitative evaluation model needs to be adjusted.

[0018] Optionally, the engineering parameters include: seismic exploration data and drilling data; based on the engineering parameters, paleogeomorphological analysis is performed on the area to be evaluated to obtain corresponding paleogeomorphological analysis results, including:

[0019] Using the seismic exploration data and the drilling data, paleogeomorphological reconstruction is performed on the area to be evaluated to obtain a paleogeomorphological model of the depositional period;

[0020] The paleogeographic model was analyzed for sedimentary thickness, sediment source, and organic matter enrichment areas to obtain the corresponding paleogeographic analysis results.

[0021] Optionally, based on the geological parameters and the engineering parameters, a preservation condition analysis is performed to obtain the corresponding preservation condition analysis results, including:

[0022] Based on the seismic exploration data and the drilling data, the caprock sealing performance was assessed, and the thickness, density, and sealing performance of the top and bottom plates were analyzed.

[0023] Based on the seismic exploration data and geological parameters, fault activity analysis is performed to determine the fault distribution and degree of fault activity in the area to be evaluated, so as to obtain the results of the impact of major fault damage.

[0024] Optionally, based on the geological parameters and the engineering parameters, a preservation condition analysis is performed to obtain the corresponding preservation condition analysis results, which further includes:

[0025] Extracting stratigraphic dip angles from seismic profiles;

[0026] The time thickness of the upper pumice layer is converted using a preset velocity model to obtain the depth thickness of the upper pumice layer; the seismic profile and the time thickness are generated based on the seismic exploration data;

[0027] The drilling data was used to verify the formation dip angle and the depth and thickness of the upper floating rock layer, respectively.

[0028] Secondly, the present invention provides an evaluation device for favorable shale gas areas, comprising:

[0029] The acquisition module is used to acquire the geological and engineering parameters of the area to be evaluated.

[0030] The paleogeomorphology analysis module is used to perform paleogeomorphology analysis on the area to be evaluated based on the engineering parameters, and obtain the corresponding paleogeomorphology analysis results.

[0031] The preservation condition analysis module is used to perform preservation condition analysis based on the geological parameters and the engineering parameters, and obtain the corresponding preservation condition analysis results.

[0032] The evaluation model construction module is used to quantify the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assign weights to multiple preset parameter types to construct a quantitative evaluation model.

[0033] The evaluation result determination module is used to obtain the quantitative evaluation results of the corresponding shale gas favorable areas through the quantitative evaluation model.

[0034] Thirdly, the present invention provides an electronic device including a processor and a memory, the memory storing computer-readable instructions that, when executed by the processor, perform the steps of the method provided in the first aspect above.

[0035] Fourthly, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the method provided in the first aspect above.

[0036] Fifthly, the present invention provides a computer program product comprising a computer program that, when executed by a processor, performs the steps of the method provided in the first aspect above.

[0037] As can be seen from the above technical solutions, the present invention has the following advantages:

[0038] This invention provides a method and apparatus for evaluating favorable shale gas areas. The method includes: acquiring geological and engineering parameters of the area to be evaluated; performing paleogeomorphological analysis on the area to be evaluated based on the engineering parameters to obtain corresponding paleogeomorphological analysis results; performing preservation condition analysis based on the geological and engineering parameters to obtain corresponding preservation condition analysis results; quantifying the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assigning preset weights to multiple parameter types to construct a quantitative evaluation model; and obtaining the corresponding quantitative evaluation result of the favorable shale gas area through the quantitative evaluation model. By comprehensively analyzing paleogeomorphological characteristics, preservation conditions, and multiple key geological parameters, a quantitative evaluation model is established to obtain the corresponding quantitative evaluation result of the favorable shale gas area. Compared with single-parameter evaluation methods, this method can more comprehensively and accurately reflect the actual occurrence of shale gas reservoirs, thereby effectively reducing blind exploration and significantly lowering exploration risks. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the steps of an embodiment of the method for evaluating favorable shale gas areas according to the present invention.

[0041] Figure 2 This is a flowchart illustrating the steps of a second embodiment of the method for evaluating favorable shale gas areas according to the present invention.

[0042] Figure 3 This is a schematic diagram of a paleogeographic model of a second embodiment of the method for evaluating favorable shale gas areas according to the present invention;

[0043] Figure 4 This is a schematic diagram of shale distribution in Embodiment 2 of the method for evaluating favorable shale gas areas according to the present invention;

[0044] Figure 5 This is a schematic diagram of the distribution of high-quality shale in Embodiment 2 of the method for evaluating favorable shale gas areas according to the present invention;

[0045] Figure 6 This is a schematic diagram illustrating the caprock sealing performance assessment of a second embodiment of the shale gas favorable zone evaluation method of the present invention.

[0046] Figure 7 This is a fracture grading plan view of Embodiment 2 of the evaluation method for favorable shale gas areas of the present invention;

[0047] Figure 8 This is a distribution map of shale gas favorable areas in Embodiment 2 of the evaluation method for shale gas favorable areas of the present invention;

[0048] Figure 9 This is a schematic diagram of drilling verification of a shale gas favorable area in Embodiment 2 of the evaluation method for shale gas favorable areas of the present invention.

[0049] Figure 10 This is a comprehensive evaluation diagram of the SX2 well, which is a second embodiment of the evaluation method for favorable shale gas areas of the present invention.

[0050] Figure 11 This is a comprehensive evaluation diagram of the SD3 well, which is a second embodiment of the evaluation method for favorable shale gas areas according to the present invention.

[0051] Figure 12 This is a structural block diagram of an embodiment of an evaluation device for favorable shale gas areas according to the present invention. Detailed Implementation

[0052] This invention provides a method and apparatus for evaluating favorable shale gas areas, which can improve the accuracy of shale gas area evaluation and the success rate of exploration.

[0053] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0054] Example 1, please refer to Figure 1 , Figure 1 This is a flowchart illustrating the steps of an embodiment of a method for evaluating favorable shale gas areas according to the present invention. The method includes:

[0055] Step S101: Obtain the geological and engineering parameters of the area to be evaluated;

[0056] In this embodiment of the disclosure, in order to perform paleogeomorphological analysis, preservation condition analysis, and construct a quantitative evaluation model for the area to be evaluated, it is necessary to obtain the geological parameters and engineering parameters of the area to be evaluated.

[0057] Step S102: Based on the engineering parameters, perform paleogeomorphological analysis on the area to be evaluated to obtain the corresponding paleogeomorphological analysis results;

[0058] It should be noted that paleogeomorphological analysis can be used to study the evolution of the Earth's surface morphology in the past and the reasons for its formation. In the evaluation of shale gas, paleogeomorphological analysis can help assess the potential reserves, accumulation conditions, and development prospects of shale gas.

[0059] Step S103: Based on the geological parameters and the engineering parameters, perform a preservation condition analysis to obtain the corresponding preservation condition analysis results;

[0060] It should be noted that preservation condition analysis can be used to assess the effectiveness and persistence of underground gas storage. Its goal is to identify favorable geological conditions that create a conducive environment for the generation, migration, and storage of shale gas.

[0061] In this embodiment of the disclosure, the preservation condition analysis includes a comprehensive assessment of caprock sealing, fault activity, and tectonic deformation to ensure the long-term stability of the gas reservoir.

[0062] Step S104: Quantify the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assign preset weights to multiple parameter types to construct a quantitative evaluation model;

[0063] It should be noted that after obtaining geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, these results are quantified and assigned different weights to construct a quantitative evaluation model.

[0064] Step S105: Obtain the quantitative evaluation results of the corresponding shale gas favorable area through the quantitative evaluation model.

[0065] In this embodiment of the disclosure, by using a quantitative evaluation model and performing weighted superposition calculations based on selected parameters, a quantitative evaluation result of the shale gas favorable area in the area to be tested can be obtained, which can be used as a basis for development and exploration by staff.

[0066] In an optional embodiment, after obtaining the quantitative evaluation results of the corresponding shale gas favorable area through the quantitative evaluation model, the method further includes:

[0067] The quantitative evaluation results were then verified.

[0068] In this embodiment of the disclosure, the quantitative evaluation results of favorable shale gas areas need to be verified.

[0069] This invention provides a method for evaluating favorable shale gas areas, comprising: acquiring geological and engineering parameters of the area to be evaluated; performing paleogeomorphological analysis on the area to be evaluated based on the engineering parameters to obtain corresponding paleogeomorphological analysis results; performing preservation condition analysis based on the geological and engineering parameters to obtain corresponding preservation condition analysis results; quantifying the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assigning preset weights to multiple parameter types to construct a quantitative evaluation model; and obtaining the corresponding quantitative evaluation result of the favorable shale gas area through the quantitative evaluation model. By comprehensively analyzing paleogeomorphological characteristics, preservation conditions, and multiple key geological parameters, a quantitative evaluation model is established to obtain the corresponding quantitative evaluation result of the favorable shale gas area. Compared with single-parameter evaluation methods, this method can more comprehensively and accurately reflect the actual occurrence of shale gas reservoirs, thereby effectively reducing blind exploration and significantly lowering exploration risks.

[0070] Example 2, please refer to Figure 2 , Figure 2 This is a flowchart illustrating the steps of a second embodiment of the method for evaluating favorable shale gas areas according to the present invention. The steps include:

[0071] S201, Obtain the geological and engineering parameters of the area to be evaluated; the engineering parameters include: seismic exploration data and drilling data;

[0072] In this embodiment, geological parameters mainly include gas content, porosity, and total organic carbon (TOC) content, while engineering parameters mainly include seismic exploration data, drilling data, and mechanical parameters. The classification criteria for geological and engineering parameters of shale gas reservoir evaluation in this embodiment are shown in Table 1 below.

[0073]

[0074] Table 1

[0075] S202, using the seismic exploration data and the drilling data, paleogeomorphological reconstruction is performed on the area to be evaluated to obtain a paleogeomorphological model of the depositional period;

[0076] In this embodiment of the disclosure, a paleogeographic model of the depositional period is established using seismic exploration data, drilling data, and stratigraphic chronology data, such as... Figure 3 The paleogeographic model diagram of Example 2 of an evaluation method for favorable shale gas areas is shown.

[0077] S203, Perform sediment thickness analysis, sediment source analysis and organic matter enrichment zone analysis on the paleogeomorphic model to obtain the corresponding paleogeomorphic analysis results;

[0078] In this embodiment, based on a paleogeomorphological model, sedimentary thickness analysis, sediment source analysis, and organic matter enrichment zone analysis are performed to obtain the formation and distribution patterns of shale gas reservoirs. This allows for the determination of the control effect of paleogeomorphology on shale gas sedimentary thickness, sediment source, and organic matter enrichment, thus enabling the preliminary delineation of shale gas enrichment zones. Please refer to [link to previous document]. Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of shale distribution in Embodiment 2 of the method for evaluating favorable shale gas areas according to the present invention. Figure 5 This is a schematic diagram of the distribution of high-quality shale in Embodiment 2 of the evaluation method for favorable shale gas areas of the present invention. This embodiment is based on a paleogeographic model. Figure 4 The paleogeographic analysis of the shale distribution map shown yielded the following results: Figure 5 The map shows the distribution of high-quality shale.

[0079] S204. Based on the seismic exploration data and the drilling data, the caprock sealing performance is assessed to obtain the thickness, density, and sealing analysis results of the top and bottom plates.

[0080] Preservation conditions determine whether shale gas can be preserved in the reservoir for a long time and successfully explored and extracted. This disclosure's embodiments analyze the thickness, tightness, and sealing of the caprock above the reservoir through caprock sealing assessment to ensure that gas does not escape. Fault activity analysis is also conducted. Figure 6 The diagram shows an example of caprock sealing assessment in Implementation Method 2 of a method for evaluating favorable shale gas areas.

[0081] S205. Based on the seismic exploration data and the geological parameters, conduct fault activity analysis to determine the fault distribution and fault activity degree of the area to be evaluated, so as to obtain the results of the impact of the major fault damage.

[0082] In this disclosed embodiment, in addition to assessing the caprock sealing, seismic exploration and fault activity studies are used to evaluate the distribution and activity level of faults and identify high-risk leakage zones, such as... Figure 7 The fracture classification plan view of Example 2 of the evaluation method for favorable shale gas areas is shown, where the serial number is the fault number.

[0083] While paleogeographic preservation conditions, such as paleochannels and paleotectonic morphology, have a significant impact on the formation, preservation, and gas accumulation of shale gas reservoirs, existing evaluation methods often overlook this crucial factor. This disclosure, by incorporating paleogeographic preservation conditions into subsequent quantitative evaluation models, enables a better assessment of reservoir continuity and preservation conditions, facilitating the accurate delineation of high-quality shale gas-bearing areas.

[0084] S206, Extract the stratigraphic dip angle from the seismic profile;

[0085] In this embodiment of the disclosure, a seismic profile is generated based on seismic exploration data, then stratigraphic reflection interfaces are identified from the seismic profile, and subsequently, the dip angle of the stratigraphy is measured using a seismic attribute analysis tool.

[0086] S207, The time thickness of the upper floating rock layer is converted using a preset velocity model to obtain the depth thickness of the upper floating rock layer; the seismic profile and the time thickness are generated based on the seismic exploration data;

[0087] In this embodiment of the disclosure, the strata changes of the underground structure are analyzed based on engineering data, the time thickness of the overlying rock layer is extracted, and then the time thickness of the overlying rock layer is converted into depth thickness using a velocity model to obtain the depth thickness of the overlying rock layer.

[0088] S208, Using the drilling data, verify the formation dip angle and the depth and thickness of the upper floating rock layer respectively;

[0089] In this embodiment of the disclosure, the dip angle logging data in the drilling data is analyzed to verify the formation dip angle obtained in step S206; and the formation logging information (such as sonic logging and density logging) in the drilling data is used to verify the depth and thickness of the upper floating rock layer obtained in step S207.

[0090] Through caprock sealing assessment and fault activity analysis, the preservation conditions were analyzed in depth, and the main factors of preservation conditions in this block were finally determined. Based on the verified stratigraphic dip angle and overlying strata thickness, preservation condition evaluation criteria were established, as shown in Table 2: Shale Gas Preservation Condition Evaluation Criteria.

[0091]

[0092] Table 2

[0093] S209, quantify the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assign weights to multiple preset parameter types to construct a quantitative evaluation model;

[0094] This embodiment of the disclosure establishes a comprehensive multi-parameter quantitative evaluation model to systematically evaluate the shale gas accumulation conditions in the area to be evaluated. Different weights are assigned to each parameter based on its influence on shale gas accumulation and preservation, and the evaluation results of various geological parameters, engineering parameters, paleogeomorphology, and preservation conditions are superimposed to form a comprehensive evaluation standard, as shown in Table 3.

[0095]

[0096] Table 3

[0097] S210, Using the quantitative evaluation model, the corresponding quantitative evaluation results of shale gas favorable areas are obtained;

[0098] S211, according to the quantitative evaluation results of the shale gas favorable area, the area to be evaluated is divided into multiple shale gas favorable areas of different levels;

[0099] Please see Figure 8 , Figure 8 This is a distribution map of shale gas favorable areas in Embodiment 2 of the evaluation method for shale gas favorable areas of the present invention. According to the quantitative evaluation results of shale gas favorable areas, this embodiment marks shale gas favorable areas of different levels and recommends areas with higher scores as priority development targets.

[0100] S212, In the area to be evaluated, conduct on-site drilling verification based on the shale gas favorable areas of different levels;

[0101] To verify the accuracy of the quantitative evaluation results of shale gas favorable areas, this embodiment of the disclosure will conduct field drilling verification in shale gas favorable areas of different grades. Please refer to [link to relevant documentation]. Figure 9 The SX2 well was drilled in Class I area, and two SD2 wells were drilled in Class III area. Please refer to [link / reference]. Figure 10 , Figure 10 This is a comprehensive evaluation chart of well SX2, a single well in Example 2 of the evaluation method for favorable shale gas areas according to the present invention. Table 3 shows the criteria for judging the actual drilled reservoir quality. It can be seen that well SX2, drilled in a Class I area, has relatively good actual drilled reservoir quality, and the development of Class I reservoirs is consistent with the prediction. Please refer to 11. Figure 11 The image shows a comprehensive evaluation of the SD3 well, which is an example of a second embodiment of the evaluation method for favorable shale gas areas according to the present invention. As can be seen, the SD3 well, which was drilled in a Class III area, had poor reservoir quality. The comprehensive evaluation of the well was consistent with the prediction of Class III reservoir.

[0102] S213, Based on the verification results, determine whether the quantitative evaluation model needs to be adjusted.

[0103] In this embodiment of the disclosure, if the verification results show that the field drilling results are inconsistent with the quantitative evaluation results of the shale gas favorable area, the weight parameters of the quantitative evaluation model can be adjusted.

[0104] This invention discloses a method for evaluating favorable shale gas areas, comprising: acquiring geological and engineering parameters of the area to be evaluated; performing paleogeomorphological analysis on the area to be evaluated based on the engineering parameters to obtain corresponding paleogeomorphological analysis results; performing preservation condition analysis based on the geological and engineering parameters to obtain corresponding preservation condition analysis results; quantifying the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assigning preset weights to multiple parameter types to construct a quantitative evaluation model; and obtaining the corresponding quantitative evaluation result of the favorable shale gas area through the quantitative evaluation model. By comprehensively analyzing paleogeomorphological characteristics, preservation conditions, and multiple key geological parameters, a quantitative evaluation model is established to obtain the corresponding quantitative evaluation result of the favorable shale gas area. Compared with single-parameter evaluation methods, this method can more comprehensively and accurately reflect the actual occurrence of shale gas reservoirs, thereby effectively reducing blind exploration and significantly lowering exploration risks.

[0105] Example 3, please refer to Figure 3 , Figure 3 This is a structural block diagram of an embodiment of a shale gas favorable area evaluation device according to the present invention. The device includes:

[0106] Module 301 is used to acquire geological and engineering parameters of the area to be evaluated;

[0107] The paleogeomorphology analysis module 302 is used to perform paleogeomorphology analysis on the area to be evaluated based on the engineering parameters, and obtain the corresponding paleogeomorphology analysis results.

[0108] The preservation condition analysis module 303 is used to perform preservation condition analysis based on the geological parameters and the engineering parameters, and obtain the corresponding preservation condition analysis results.

[0109] The evaluation model construction module 304 is used to quantify the geological parameters, the engineering parameters, the paleogeomorphological analysis results, and the preservation condition analysis results, and assign weights to multiple preset parameter types to construct a quantitative evaluation model.

[0110] The evaluation result determination module 305 is used to obtain the corresponding quantitative evaluation results of shale gas favorable areas through the quantitative evaluation model.

[0111] In an optional embodiment, it further includes:

[0112] The verification module is used to verify the quantitative evaluation results.

[0113] In one optional embodiment, the verification module includes;

[0114] The shale gas favorable area division submodule is used to divide the area to be evaluated into multiple shale gas favorable areas of different levels according to the quantitative evaluation results of the shale gas favorable areas.

[0115] The drilling verification submodule is used to conduct on-site drilling verification in the area to be evaluated, based on the shale gas favorable areas of different levels.

[0116] The adjustment submodule is used to determine whether the quantitative evaluation model needs to be adjusted based on the verification results.

[0117] In an optional embodiment, the engineering parameters include: seismic exploration data and drilling data; the paleogeographic analysis module 302 includes:

[0118] The model acquisition submodule is used to reconstruct the paleogeography of the area to be evaluated using the seismic exploration data and the drilling data, and obtain a paleogeographic model of the depositional period.

[0119] The paleogeomorphology analysis submodule is used to perform sediment thickness analysis, sediment source analysis, and organic matter enrichment zone analysis on the paleogeomorphology model to obtain the corresponding paleogeomorphology analysis results.

[0120] In an optional embodiment, the save condition analysis module 303 includes:

[0121] The caprock sealing assessment submodule is used to assess the caprock sealing based on the seismic exploration data and the drilling data, and to obtain the thickness of the top and bottom plates and the results of their tightness and sealing analysis.

[0122] The fault activity analysis submodule is used to perform fault activity analysis based on the seismic exploration data and the geological parameters, to determine the fault distribution and fault activity degree of the area to be evaluated, so as to obtain the results of the damage impact of the major fault.

[0123] In an optional embodiment, the save condition analysis module 303 includes:

[0124] A dip angle extraction submodule is used to extract the dip angle of the strata from the seismic profile;

[0125] The submodule for determining the thickness of the upper rock layer is used to convert the time thickness of the upper rock layer using a preset velocity model to obtain the depth thickness of the upper rock layer; the seismic profile and the time thickness are generated based on the seismic exploration data;

[0126] The verification submodule is used to verify the formation dip angle and the depth and thickness of the upper floating rock layer using the drilling data.

[0127] Example 4: This embodiment of the invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of an evaluation method for a shale gas favorable area according to any embodiment.

[0128] Example 5: This embodiment of the invention also provides a computer storage medium storing a computer program thereon, which, when executed by the processor, implements the steps of an evaluation method for a shale gas favorable area according to any embodiment.

[0129] Example 6: This embodiment of the invention also provides a computer program product, on which a computer program is stored, which, when executed by the processor, implements the steps of an evaluation method for a shale gas favorable area according to any embodiment.

[0130] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the methods, apparatuses, electronic devices, and storage media disclosed in this invention can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0132] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0133] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0134] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0135] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating favorable shale gas areas, characterized in that, include: Obtain the geological and engineering parameters of the area to be evaluated; Based on the engineering parameters, paleogeomorphological analysis is performed on the area to be evaluated to obtain the corresponding paleogeomorphological analysis results. Based on the geological parameters and the engineering parameters, a preservation condition analysis was performed to obtain the corresponding preservation condition analysis results. The geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results are quantified, and multiple preset parameter type weights are assigned to construct a quantitative evaluation model. The quantitative evaluation model is used to obtain the corresponding quantitative evaluation results of shale gas favorable areas.

2. The method for evaluating favorable shale gas areas according to claim 1, characterized in that, After obtaining the quantitative evaluation results of the corresponding shale gas favorable areas through the quantitative evaluation model, the following steps are also included: The quantitative evaluation results were then verified.

3. The method for evaluating favorable shale gas areas according to claim 2, characterized in that, Verification of the quantitative evaluation results includes: Based on the quantitative evaluation results of the shale gas favorable areas, the area to be evaluated is divided into multiple shale gas favorable areas of different levels. In the area to be evaluated, on-site drilling verification was carried out based on the shale gas favorable areas of different grades; Based on the verification results, determine whether the quantitative evaluation model needs to be adjusted.

4. The method for evaluating favorable shale gas areas according to claim 1, characterized in that, The engineering parameters include: seismic exploration data and drilling data; based on the engineering parameters, paleogeomorphological analysis is performed on the area to be evaluated to obtain the corresponding paleogeomorphological analysis results, including: Using the seismic exploration data and the drilling data, paleogeomorphological reconstruction is performed on the area to be evaluated to obtain a paleogeomorphological model of the depositional period; The paleogeographic model was analyzed for sedimentary thickness, sediment source, and organic matter enrichment areas to obtain the corresponding paleogeographic analysis results.

5. The method for evaluating favorable shale gas areas according to claim 4, characterized in that, Based on the geological parameters and engineering parameters, a preservation condition analysis was performed to obtain the corresponding preservation condition analysis results, including: Based on the seismic exploration data and the drilling data, the caprock sealing performance was assessed, and the thickness, density, and sealing performance of the top and bottom plates were analyzed. Based on the seismic exploration data and geological parameters, fault activity analysis is performed to determine the fault distribution and degree of fault activity in the area to be evaluated, so as to obtain the results of the impact of major fault damage.

6. The method for evaluating favorable shale gas areas according to claim 5, characterized in that, Based on the geological parameters and engineering parameters, a preservation condition analysis is performed to obtain the corresponding preservation condition analysis results, which also includes: Extracting stratigraphic dip angles from seismic profiles; The time thickness of the upper pumice layer is converted using a preset velocity model to obtain the depth thickness of the upper pumice layer; the seismic profile and the time thickness are generated based on the seismic exploration data; The drilling data was used to verify the formation dip angle and the depth and thickness of the upper floating rock layer, respectively.

7. An evaluation device for favorable shale gas areas, characterized in that, include: The acquisition module is used to acquire the geological and engineering parameters of the area to be evaluated. The paleogeomorphology analysis module is used to perform paleogeomorphology analysis on the area to be evaluated based on the engineering parameters, and obtain the corresponding paleogeomorphology analysis results. The preservation condition analysis module is used to perform preservation condition analysis based on the geological parameters and the engineering parameters, and obtain the corresponding preservation condition analysis results. The evaluation model construction module is used to quantify the geological parameters, engineering parameters, paleogeomorphological analysis results, and preservation condition analysis results, and assign weights to multiple preset parameter types to construct a quantitative evaluation model. The evaluation result determination module is used to obtain the quantitative evaluation results of the corresponding shale gas favorable areas through the quantitative evaluation model.

8. An electronic device, characterized in that, It includes a processor and a memory, the memory storing computer-readable instructions that, when executed by the processor, perform the method as described in any one of claims 1-6.

9. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it performs the method as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1-6.

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