Equivalent mineral model and skeleton parameter determination method and device

Abstract

The invention provides an equivalent mineral model and skeleton parameter determination method and device, and the method comprises the steps: building an equivalent dry clay mineral and an equivalent brittle mineral, and forming an equivalent mineral pair; establishing an equivalent mineral model of the shale oil and gas reservoir, wherein the equivalent mineral model comprises organic matters, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas and pore water; determining a logging response equation of the equivalent mineral model; carrying out total rock mineral analysis, and determining skeleton parameters of equivalent brittle minerals; and determining the total porosity and the volume content of organic matters, and determining the skeleton parameters of the equivalent dry clay minerals according to the total porosity, the volume content of the organic matters and the skeleton parameters of the equivalent brittle minerals in combination with the logging response equation. According to the method, rapid and reliable quantitative evaluation of shale oil and gas is realized mainly depending on conventional logging information on the basis of the equivalent mineral model and the skeleton parameters.

Description

Technical Field

[0001] This application relates to the field of unconventional shale oil and gas logging evaluation technology, specifically to an equivalent mineral model and a method, apparatus, electronic equipment, and storage medium for determining framework parameters. Background Technology

[0002] Significant breakthroughs have been achieved in shale oil and gas exploration and development in my country. Determining the composition and physical properties of shale oil and gas reservoirs is fundamental to exploration and development. With limited core data from core samples, calculating shale reservoir composition and porosity using logging data is the most effective and economical method, and is also the mainstream technology internationally. However, shale oil and gas formations are complex in lithology and mineral composition. For evaluating such complex formations, the most effective method is to employ new logging techniques, including formation elemental scanning logging, high-precision two-dimensional nuclear magnetic resonance logging, and wellbore imaging logging. However, in production practice, due to cost and time constraints, typically only conventional logging data (density, neutron, acoustic, resistivity logging, etc.) and a small amount of new method logging are available. The exploration and development of complex shale oil and gas urgently requires rapid and accurate evaluation of shale oil and gas formation composition and porosity, primarily relying on conventional logging data.

[0003] Currently, multi-mineral component volumetric models and their logging response equations form the theoretical foundation for well logging formation evaluation. Establishing logging response equations for density logging, neutron logging, sonic logging, and natural gamma logging based on multi-mineral component volumetric models, and then using optimization algorithms to determine rock mineral composition and porosity, has become a common technique in the industry. However, shale oil and gas formations are characterized by complex lithology and mineral composition. The mineral components include various clay minerals such as kaolinite, montmorillonite, illite, and chlorite, as well as various brittle minerals such as quartz, calcite, dolomite, feldspar, and pyrite, and also contain organic matter and porosity. Simply relying on multi-mineral component volumetric models and their logging response equations cannot meet the requirements for shale oil and gas formation evaluation.

[0004] Well logging data acquisition is always constrained by various geological and economic factors and is therefore limited. Under these limited conditions, it is impossible to accurately determine the content and porosity of various mineral components in complex shale oil and gas formations. Therefore, how to rely primarily on conventional well logging data, combined with geological characteristics for equivalent simplification, to obtain an equivalent mineral model and its well logging response equation that conforms to shale oil and gas reservoirs, and to obtain relatively accurate formation parameters, has become a pressing technical problem to be solved in shale oil and gas well logging evaluation. Summary of the Invention

[0005] In view of this, this application provides an equivalent mineral model and a method and apparatus for determining framework parameters, in order to solve the technical problem that conventional logging data alone cannot achieve rapid and accurate evaluation of shale oil and gas formation composition and porosity.

[0006] In a first aspect, embodiments of this application provide a method for determining an equivalent mineral model and framework parameters, the method being used for shale oil and gas well logging evaluation, the method comprising:

[0007] Establish equivalent dry clay minerals and equivalent brittle minerals to form equivalent mineral pairs;

[0008] An equivalent mineral model for shale oil and gas reservoirs is established, which includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water.

[0009] Determine the logging response equation of the equivalent mineral model;

[0010] Perform whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals;

[0011] The total porosity and organic matter volume content are determined. Based on the total porosity, the organic matter volume content, and the framework parameters of the equivalent brittle mineral, and in conjunction with the well logging response equation, the framework parameters of the equivalent dry clay mineral are determined.

[0012] Furthermore, the establishment of equivalent dry clay minerals and equivalent brittle minerals includes: comprehensively utilizing various logging data to determine organic matter-poor development sections, creating density-neutron cross-plots or sonic transit-neutron cross-plots for the organic matter-poor development sections, and determining the distribution range and pattern of point clusters; if the point clusters show obvious linear correlation, then all clay minerals are equivalent to equivalent dry clay minerals, and all brittle minerals are equivalent to equivalent brittle minerals, forming equivalent mineral pairs.

[0013] Furthermore, the skeleton parameters include density, neutron porosity, and acoustic transit time.

[0014] Furthermore, the logging response equation of the equivalent mineral model is:

[0015]

[0016]

[0017]

[0018]

[0019] Where, ρ b ρ EMC ρ EMF ρ o ρ w ρ hy These are, respectively, the logging density, the density of equivalent dry clay minerals, the density of equivalent brittle minerals, the density of organic matter, the density of water in pores, and the density of oil and gas in pores; Nl N EMC N EMF N o N w N hy These represent the neutron porosity from well logging, the neutron porosity of equivalent dry clay minerals, the neutron porosity of equivalent brittle minerals, the neutron porosity of organic matter, the neutron porosity of water in pores, and the neutron porosity of oil and gas in pores; Δ t T EMC T EMF T o T w T hy These are, respectively, the sonic transit time of well logging, the sonic transit time of equivalent dry clay minerals, the sonic transit time of equivalent brittle minerals, the sonic transit time of organic matter, the sonic transit time of water in pores, and the sonic transit time of oil and gas in pores; V EMC V EMF TOC v These are the equivalent dry clay mineral skeleton volume content, equivalent brittle mineral skeleton volume content, and organic matter volume content, respectively. The total porosity of the rock; s w This represents the water saturation level in the pores.

[0020] Furthermore, the step of performing whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals includes: performing whole-rock mineral analysis to determine the content of major minerals; removing clay mineral content from the mineral composition, calculating the remaining brittle minerals to determine the relative content of a single brittle mineral in the total brittle minerals; determining the theoretical framework parameter value of a single brittle mineral; and determining the framework parameters of equivalent brittle minerals by performing a weighted average based on the relative content of the single brittle mineral in the total brittle minerals.

[0021] Furthermore, the total porosity of the rock is determined using nuclear magnetic resonance logging, and the organic matter volume content is calculated using the ΔLOG R method or other empirical formulas. The total porosity, organic matter volume content, and the framework parameters of the equivalent brittle minerals are substituted into the logging response equation, and the framework parameters of the equivalent dry clay minerals are determined through optimization iteration.

[0022] Furthermore, after determining the total porosity and organic matter volume content, and determining the equivalent dry clay mineral skeleton parameters based on the total porosity, the organic matter volume content, and the equivalent brittle mineral skeleton parameters, combined with the well logging response equation, the method further includes: evaluating the formation composition and porosity of the shale oil and gas interval based on the equivalent brittle mineral skeleton parameters, the equivalent dry clay mineral skeleton parameters, and the well logging response equation.

[0023] Secondly, embodiments of this application provide an equivalent mineral model and framework parameter determination device, the equivalent mineral model and framework parameter determination method being used for shale oil and gas logging evaluation, the device comprising:

[0024] The equivalent mineral pair creation module establishes equivalent dry clay minerals and equivalent brittle minerals, forming equivalent mineral pairs;

[0025] The equivalent mineral model establishment module establishes an equivalent mineral model of shale oil and gas reservoirs. The equivalent mineral model includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water.

[0026] The well logging response equation determination module determines the well logging response equation of the equivalent mineral model;

[0027] The module for determining the framework parameters of equivalent brittle minerals performs whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals.

[0028] The equivalent dry clay mineral skeleton parameter determination module determines the total porosity and organic matter volume content. Based on the total porosity, the organic matter volume content, and the skeleton parameters of the equivalent brittle mineral, combined with the well logging response equation, the equivalent dry clay mineral skeleton parameters are determined.

[0029] Thirdly, embodiments of this application provide an electronic device, including:

[0030] processor;

[0031] Memory;

[0032] And a computer program, wherein the computer program is stored in the memory, the computer program including instructions that, when executed by the processor, cause the electronic device to perform the method described in any one of the first aspects.

[0033] Fourthly, embodiments of this application provide a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any one of the first aspects.

[0034] Based on the theoretical foundation of the mineral volume model, this application, through the constraints of geological consistency and inheritance, and using whole-rock analysis and nuclear magnetic resonance logging results from a limited number of cored wells, determines equivalent minerals. Shale components are categorized into four components: equivalent brittle mineral EMF, equivalent dry clay mineral EMC, organic matter, and porosity. Furthermore, the framework parameter values ​​for equivalent brittle mineral EMF and equivalent dry clay mineral EMC are determined. This allows for the determination of shale oil and gas reservoir formation composition and porosity, enabling rapid and accurate evaluation of shale oil and gas formation composition and porosity primarily based on conventional logging data, providing a basis for shale oil and gas resource evaluation and development plan design. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A flowchart illustrating an equivalent mineral model and a method for determining framework parameters provided in an embodiment of this application;

[0037] Figure 2 Density-neutron cross plot of the organic-poor shale section of Well X provided in this application embodiment;

[0038] Figure 3 Equivalent mineral model of shale oil and gas reservoir provided in the embodiments of this application;

[0039] Figure 4 Total porosity determined by nuclear magnetic resonance logging in the embodiments of this application;

[0040] Figure 5 The formation composition and porosity evaluation results of shale oil and gas in Well X based on equivalent mineral models and framework parameters are provided in the embodiments of this application.

[0041] Figure 6 A structural block diagram of an equivalent mineral model and a framework parameter determination device provided in this application embodiment;

[0042] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0043] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0045] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] During geological evolution, the evolution of different regions exhibits relative stability and inheritance, leading to relative stability in the composition and distribution of rocks, which is reflected in regularities in well logging responses. The Paleogene Fu-2 Member of the Qintong Depression in eastern my country has been confirmed as a large-scale shale oil development zone. The stratigraphic composition is highly complex, including more than ten minerals besides organic matter, such as illite, illite-saturated mixed layers, quartz, plagioclase, analcime, calcite, dolomite, and pyrite. Despite this complexity, in organic-poor sections, cross-plotting techniques have revealed the stability and regularity of density-neutron cross-plot groups, which are similar to well logging dual-mineral cross-plot groups. This indicates that even in complex lithology and mineral composition zones, a pair of equivalent minerals can be used to approximate the well logging response patterns of shale oil and gas reservoir components, allowing for the determination of shale oil and gas composition and porosity. For shale oil and gas exploration and development, particular attention is paid to the total organic matter (TOC), clay mineral content, and brittle mineral content. To address the needs of shale oil and gas exploration and development, and considering regional geological characteristics, minerals are grouped together and termed equivalent minerals. Well X is a shale oil and gas well in an eastern basin of my country. This application uses Well X as an example to further illustrate the method described in this application.

[0048] See Figure 1 This is a flowchart illustrating a method for determining an equivalent mineral model and framework parameters according to an embodiment of this application. The method is used for shale oil and gas well logging evaluation, and the framework parameters include density, neutron porosity, and sonic transit time. Figure 1 As shown, the method mainly includes the following steps.

[0049] S101: Establish equivalent dry clay minerals and equivalent brittle minerals to form equivalent mineral pairs.

[0050] By comprehensively utilizing various logging data from Well X, including natural gamma, density, neutron, sonic transit time, and resistivity, the organic matter-poor development zone of Well X was determined. A density-neutron cross-plot was then created for this zone, and the results are as follows: Figure 2 As shown. From Figure 2 As can be seen, the point group exhibits a clear linear correlation, which meets the conditions of the equivalent mineral model for shale oil and gas reservoirs. Therefore, all types of dry clay minerals are equivalent to equivalent dry clay minerals EMC, and all types of brittle minerals are equivalent to equivalent brittle minerals EMF, forming equivalent mineral pairs to establish the equivalent mineral model for shale oil and gas reservoirs.

[0051] S102: Establish an equivalent mineral model for shale oil and gas reservoirs, wherein the equivalent mineral model includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water.

[0052] Based on the established equivalent dry clay minerals and equivalent brittle minerals, an equivalent mineral model of the shale oil and gas reservoir in Well X is constructed, such as... Figure 3 As shown, the equivalent mineral model of shale oil and gas reservoirs includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water.

[0053] S103: Determine the logging response equation of the equivalent mineral model.

[0054] The logging response equation of the equivalent mineral model is:

[0055]

[0056]

[0057]

[0058]

[0059] Where, ρ b ρ EMC ρ EMF ρ o ρ w ρ hy These are, respectively, the logging density, the density of equivalent dry clay minerals, the density of equivalent brittle minerals, the density of organic matter, the density of water in pores, and the density of oil and gas in pores; N l N EMC N EMF N o N w N hyThese represent the neutron porosity from well logging, the neutron porosity of equivalent dry clay minerals, the neutron porosity of equivalent brittle minerals, the neutron porosity of organic matter, the neutron porosity of water in pores, and the neutron porosity of oil and gas in pores; Δ t T EMC T EMF T o T w T hy These are, respectively, the sonic transit time of well logging, the sonic transit time of equivalent dry clay minerals, the sonic transit time of equivalent brittle minerals, the sonic transit time of organic matter, the sonic transit time of water in pores, and the sonic transit time of oil and gas in pores; V EMC V EMF TOC v These are the equivalent dry clay mineral skeleton volume content, equivalent brittle mineral skeleton volume content, and organic matter volume content, respectively. The total porosity of the rock; s w This represents the water saturation level in the pores.

[0060] S104: Perform whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals.

[0061] Whole-rock mineral analysis was performed using X-ray diffraction. The results were statistically analyzed to generate a histogram, determining the content of major minerals. These major minerals included clay minerals, quartz, plagioclase, analcime, calcite, and dolomite, among other crystalline minerals. Table 1 shows the statistical table of major mineral contents. After removing clay minerals from the mineral composition, the relative content of the remaining brittle minerals was calculated. The remaining brittle minerals included quartz, plagioclase, analcime, calcite, and dolomite. Table 2 shows the relative content of each brittle mineral. The theoretical framework parameters of individual brittle minerals were determined by consulting literature, and these parameters are shown in Table 3. A weighted average was then calculated based on the relative content of each individual brittle mineral to the total brittle minerals to determine the framework parameters of the equivalent brittle minerals.

[0062] Table 1:

[0063] clay minerals % quartz% Sodium plagioclase % % of zeolite calcite% dolomite% Total brittle minerals % 35 25 12 7.5 8.5 10 63

[0064] Table 2:

[0065] quartz% Sodium plagioclase % % of zeolite calcite% dolomite% Normalized total amount of brittle minerals 39.7 19.0 11.9 13.5 15.9 100.0

[0066] Table 3:

[0067]

[0068] S105: Determine the total porosity and organic matter volume content. Based on the total porosity, the organic matter volume content, and the framework parameters of the equivalent brittle mineral, and in conjunction with the well logging response equation, determine the framework parameters of the equivalent dry clay mineral.

[0069] The total porosity Φt of rocks is determined using nuclear magnetic resonance logging. Figure 4 As shown in Table 4, the organic matter volume content (TOCv) was calculated using the ΔLOG R method or other empirical formulas. The total porosity of the rock, the organic matter volume content, and the framework parameters of the equivalent brittle minerals were substituted into the logging response equation, and the framework parameters of the equivalent dry clay minerals were determined through optimization iteration. The final determined framework parameters of the equivalent brittle minerals and the equivalent dry clay minerals are shown in Table 4.

[0070] Table 4:

[0071] Density, g / cm3 neutron,% Acoustic transit time, μs / m Acoustic wave time difference, μs / ft Equivalent brittle mineral EMF 2.65 -0.01 172 52.5 Equivalent dry clay mineral EMC 2.8 26 174 53

[0072] After determining the framework parameters of equivalent brittle minerals and equivalent dry clay minerals, the formation composition and porosity of the shale oil and gas interval are evaluated based on these parameters and the well logging response equation. This includes evaluating the volumetric content of clay minerals, brittle minerals, and porosity in the shale oil and gas interval. The evaluation results for the volumetric content of clay minerals, brittle minerals, and porosity in the shale oil and gas interval of well X are as follows: Figure 5 As shown. Figure 5 The diagram illustrates the logging evaluation of other shale oil and gas sections using conventional logging data according to the method of this application. The results show the calculated clay mineral content, calculated brittle mineral content, and calculated porosity obtained from logging, as well as the measured results of clay mineral content, total brittle mineral content, and porosity from core samples. Comparing the calculated logging results with the measured core results shows that they are generally consistent, indicating that the equivalent mineral model and framework parameter determination method of this application is reasonable and can achieve rapid and reliable quantitative evaluation of shale oil and gas based on the equivalent mineral model and framework parameters.

[0073] Based on the theoretical foundation of the mineral volume model, this application, through the constraints of geological consistency and inheritance, and using whole-rock analysis and nuclear magnetic resonance logging results from a limited number of cored wells, determines equivalent minerals. Shale components are categorized into four components: equivalent brittle mineral EMF, equivalent dry clay mineral EMC, organic matter, and porosity. Furthermore, the framework parameter values ​​for equivalent brittle mineral EMF and equivalent dry clay mineral EMC are determined. This allows for the determination of shale oil and gas reservoir formation composition and porosity, enabling rapid and accurate evaluation of shale oil and gas formation composition and porosity primarily based on conventional logging data, providing a basis for shale oil and gas resource evaluation and development plan design.

[0074] Corresponding to the above embodiments, this application also provides an equivalent mineral model and a device for determining skeleton parameters.

[0075] See Figure 6 This is a structural block diagram of an equivalent mineral model and a framework parameter determination device provided in an embodiment of this application. Figure 6 As shown, it mainly includes the following modules.

[0076] Equivalent mineral pair establishment module 601 establishes equivalent dry clay minerals and equivalent brittle minerals to form equivalent mineral pairs;

[0077] The equivalent mineral model establishment module 602 establishes an equivalent mineral model of the shale oil and gas reservoir. The equivalent mineral model includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water.

[0078] The well logging response equation determination module 603 determines the well logging response equation of the equivalent mineral model;

[0079] The equivalent brittle mineral skeleton parameter determination module 604 performs whole-rock mineral analysis to determine the equivalent brittle mineral skeleton parameters;

[0080] The equivalent dry clay mineral skeleton parameter determination module 605 determines the total porosity and organic matter volume content. Based on the total porosity, the organic matter volume content, and the skeleton parameters of the equivalent brittle mineral, and in conjunction with the well logging response equation, the equivalent dry clay mineral skeleton parameters are determined.

[0081] It should be noted that the specific content involved in the embodiments of this application can be found in the description of the above method embodiments, and will not be repeated here for the sake of brevity.

[0082] Corresponding to the above embodiments, this application also provides an electronic device.

[0083] See Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 7 As shown, the electronic device 700 may include a processor 701, a memory 702, and a communication unit 703. These components communicate via one or more buses. Those skilled in the art will understand that the electronic device structure shown in the figures does not constitute a limitation on the embodiments of this application. It may be a bus topology or a star topology, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0084] The communication unit 703 is used to establish a communication channel, thereby enabling the electronic device to communicate with other devices.

[0085] The processor 701 serves as the control center of the electronic device, connecting various parts of the device via various interfaces and lines. It executes software programs and / or modules stored in the memory 702, and calls data stored in the memory to perform various functions and / or process data. The processor can be composed of integrated circuits (ICs), such as a single packaged IC or multiple packaged ICs with the same or different functions connected together. For example, the processor 701 may consist only of a central processing unit (CPU). In this embodiment, the CPU may have a single processing core or include multiple processing cores.

[0086] Memory 702 is used to store the execution instructions of processor 701. Memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0087] When the execution instructions in memory 702 are executed by processor 701, the electronic device 700 is able to perform some or all of the steps in the above method embodiments.

[0088] Corresponding to the above embodiments, this application also provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program runs, it can control the device where the computer-readable storage medium is located to execute some or all of the steps in the above method embodiments. Specifically, the computer-readable storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0089] Corresponding to the above embodiments, this application also provides a computer program product containing executable instructions that, when executed on a computer, cause the computer to perform some or all of the steps in the above method embodiments.

[0090] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0091] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0092] Those skilled in the art will 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.

[0093] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a 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 this application. The aforementioned 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.

[0094] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for determining an equivalent mineral model and its framework parameters, wherein the method is used for shale oil and gas well logging evaluation, characterized in that... include: Establish equivalent dry clay minerals and equivalent brittle minerals to form equivalent mineral pairs; An equivalent mineral model for shale oil and gas reservoirs is established, which includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water. Determine the logging response equation of the equivalent mineral model; Perform whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals; The total porosity and organic matter volume content are determined. Based on the total porosity, the organic matter volume content, and the framework parameters of the equivalent brittle mineral, and in conjunction with the well logging response equation, the framework parameters of the equivalent dry clay mineral are determined.

2. The method according to claim 1, characterized in that, The establishment of equivalent dry clay minerals and equivalent brittle minerals includes: comprehensively utilizing various logging data to determine organic matter-poor development sections, creating density-neutron cross plots or sonic transit-neutron cross plots for the organic matter-poor development sections, and determining the distribution range and pattern of point clusters; if the point clusters show obvious linear correlation, then all clay minerals are equivalent to equivalent dry clay minerals, and all brittle minerals are equivalent to equivalent brittle minerals, forming equivalent mineral pairs.

3. The method according to claim 1, characterized in that, The skeleton parameters include density, neutron porosity, and acoustic transit time.

4. The method according to claim 1, characterized in that, The logging response equation of the equivalent mineral model is: Where, ρ b ρ EMC ρ EMF ρ o ρ w ρ hy These are, respectively, the logging density, the density of equivalent dry clay minerals, the density of equivalent brittle minerals, the density of organic matter, the density of water in pores, and the density of oil and gas in pores; N l N EMC N EMF N o N w N hy These represent the neutron porosity from well logging, the neutron porosity of equivalent dry clay minerals, the neutron porosity of equivalent brittle minerals, the neutron porosity of organic matter, the neutron porosity of water in pores, and the neutron porosity of oil and gas in pores; Δ t T EMC T EMF T o T w T hy These are, respectively, the sonic transit time of well logging, the sonic transit time of equivalent dry clay minerals, the sonic transit time of equivalent brittle minerals, the sonic transit time of organic matter, the sonic transit time of water in pores, and the sonic transit time of oil and gas in pores; V EMC V EMF TOC v These are the equivalent dry clay mineral skeleton volume content, equivalent brittle mineral skeleton volume content, and organic matter volume content, respectively. The total porosity of the rock; s w This represents the water saturation level in the pores.

5. The method according to claim 1, characterized in that, The process of performing whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals includes: performing whole-rock mineral analysis to determine the content of major minerals; removing clay minerals from the mineral composition and calculating the relative content of the remaining brittle minerals to determine the relative content of each individual brittle mineral to the total brittle minerals; determining the theoretical framework parameter value of each individual brittle mineral; and determining the framework parameters of the equivalent brittle minerals by performing a weighted average based on the relative content of each individual brittle mineral to the total brittle minerals.

6. The method according to claim 4, characterized in that, The total porosity of the rock is determined by nuclear magnetic resonance logging, and the organic matter volume content is calculated by the ΔLOG R method or other empirical formulas. The total porosity, organic matter volume content, and the framework parameters of the equivalent brittle minerals are substituted into the logging response equation, and the framework parameters of the equivalent dry clay minerals are determined by optimization iteration.

7. The method according to claim 1, characterized in that, After determining the total porosity and organic matter volume content, and determining the equivalent dry clay mineral skeleton parameters based on the total porosity, the organic matter volume content, and the equivalent brittle mineral skeleton parameters, combined with the well logging response equation, the method further includes: evaluating the formation composition and porosity of the shale oil and gas interval based on the equivalent brittle mineral skeleton parameters, the equivalent dry clay mineral skeleton parameters, and the well logging response equation.

8. An equivalent mineral model and framework parameter determination device, wherein the equivalent mineral model and framework parameter determination method is used for shale oil and gas logging evaluation, characterized in that, include: The equivalent mineral pair creation module establishes equivalent dry clay minerals and equivalent brittle minerals, forming equivalent mineral pairs; The equivalent mineral model establishment module establishes an equivalent mineral model of shale oil and gas reservoirs. The equivalent mineral model includes organic matter, equivalent dry clay minerals, equivalent brittle minerals, pore oil and gas, and pore water. The well logging response equation determination module determines the well logging response equation of the equivalent mineral model; The module for determining the framework parameters of equivalent brittle minerals performs whole-rock mineral analysis to determine the framework parameters of equivalent brittle minerals. The equivalent dry clay mineral skeleton parameter determination module determines the total porosity and organic matter volume content. Based on the total porosity, the organic matter volume content, and the skeleton parameters of the equivalent brittle mineral, combined with the well logging response equation, the equivalent dry clay mineral skeleton parameters are determined.

9. An electronic device, characterized in that, include: processor; Memory; And a computer program, wherein the computer program is stored in the memory, the computer program including instructions that, when executed by the processor, cause the electronic device to perform the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 7.

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