Preparation method of water-sensitive shale with adjustable permeability, porosity and wettability and synthetic shale

Abstract

The invention provides a preparation method of water-sensitive shale with adjustable permeability, porosity and wettability and synthetic shale, and relates to the technical field of geological engineering. At present, synthetic shale focuses on reduction of mechanical properties of real rocks, but the seepage characteristics of the synthetic shale are influenced by pore structures and wetting characteristics, so that the synthetic shale is difficult to carry out seepage experiments, especially influences of clay hydration on the seepage characteristics cannot be reduced. Mineral powder with the same particle size as natural shale components is selected as a mineral component raw material, humic acid is selected as an organic matter component raw material of an artificial sample, unsaturated epoxy resin is selected as a binder, and a micro-pore structure and pore size distribution characteristics which are the same as those of natural rocks are obtained by adjusting pressing time and pressure; meanwhile, the wetting characteristic and the hydration expansion characteristic of an artificial sample are adjusted by changing mineral components, the pore structure and the wetting characteristic of a natural sample are reduced, and the analogy of synthetic shale and natural shale is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geological engineering, and particularly to a preparation method of water-sensitive shale and synthetic shale that can adjust permeability, porosity, and wettability. Background Art

[0002] As an unconventional oil and gas reservoir, the permeability and pore characteristics of shale are crucial for oil and gas extraction. However, it is difficult to obtain natural shale samples, and there are problems such as high sample discreteness and non-reusability, which limit the in-depth study of shale seepage laws and multi-physical field coupling behaviors. In recent years, the application of artificial cores has gradually increased, and synthetic shale has become an important tool for the research of unconventional energy such as shale due to its controllability and repeatability. However, current synthetic shale mostly focuses on the reduction of mechanical properties, and there is still a lack of a preparation method for synthetic shale that can restore the seepage characteristics and hydration expansion characteristics of natural shale, which affects the flexibility and repeatability of related experiments. Therefore, how to precisely control its composition and structure to ensure the controllability and repeatability of the seepage characteristics of synthetic shale is of great significance for deeply revealing the fluid migration mechanism in low-permeability reservoirs. Summary of the Invention

[0003] The present invention provides a preparation method of water-sensitive shale and synthetic shale that can adjust permeability, porosity, and wettability to at least partially solve the above problems.

[0004] In a first aspect of the present invention, a preparation method of water-sensitive shale that can adjust permeability, porosity, and wettability is provided. The method includes: Mix brittle minerals, clay minerals, and organic matter in a preset ratio and add a binder to obtain a first mixture; Grind and screen the first mixture to obtain a second mixture; Place the second mixture in a preset mold and press the second mixture under a preset pressure for a preset time to obtain synthetic shale.

[0005] Optionally, the method further includes: Obtain the composition of the natural shale to be studied; Determine the preset ratio according to the composition of the natural shale.

[0006] Optionally, pressing the second mixture under a preset pressure for a preset time to obtain synthetic shale includes: Adjust the preset pressure and preset time respectively within a preset pressure range and a preset time range; After each adjustment is completed, press the synthetic shale after the previous pressing according to the adjusted pressure and time; After each pressing is completed, the permeability and porosity of the synthetic shale are tested. When the permeability and porosity of the rock reach the target permeability and target porosity, the synthetic shale obtained from the current pressing is used as the synthetic shale.

[0007] Optionally, the preset pressure range is: 60 - 180 MPa, and the preset time range is: 1 - 15 hours.

[0008] Optionally, the method further includes: Determining a target contact angle based on the target wettability; Determining the clay content in the first mixture based on the target contact angle and the pre - determined relationship between the contact angle and the clay content; Determining the mass percentage of the clay mineral and the preset ratio based on the clay content.

[0009] Optionally, the brittle minerals include one or more of quartz, plagioclase, potassium feldspar, and calcite.

[0010] Optionally, the clay minerals include one or more of illite, kaolinite, chlorite, and illite - montmorillonite mixed layers.

[0011] Optionally, the organic matter is humic acid and / or type II kerogen.

[0012] Optionally, the binder is: unsaturated epoxy resin.

[0013] The second aspect of the present invention provides a synthetic shale prepared by the method for preparing a water - sensitive shale with adjustable permeability, porosity, and wettability according to the first aspect.

[0014] Current synthetic shales focus on restoring the mechanical properties of real rocks. However, their seepage characteristics are affected by pore structure and wetting characteristics, making it difficult to conduct seepage experiments, especially unable to restore the influence of clay hydration on seepage characteristics. In the present invention, mineral powder with the same particle size as that of natural shale components is selected as the raw material for mineral components, humic acid is selected as the raw material for the organic matter component of the artificial sample, and unsaturated epoxy resin is selected as the binder. By adjusting the pressing time and pressure, the same microscopic pore structure and pore size distribution characteristics as those of natural rocks are obtained; at the same time, by changing the mineral components, the wetting characteristics and hydration swelling characteristics of the artificial sample are adjusted, restoring the pore structure and wetting characteristics of natural samples, and greatly improving the comparability between synthetic shale and natural shale.

[0015] In the embodiments of the present invention, the wettability of the shale can be adjusted by adjusting the mass percentage of the clay mineral (0% - 46%), thereby adjusting the clay content of the shale, and then adjusting the wettability of the prepared synthetic shale. The permeability and porosity of the prepared synthetic shale can be adjusted by adjusting the pressing time and pressure.

[0016] The preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention realizes the flexible adjustment of clay content, porosity and permeability by precisely controlling the raw material ratio, compaction time and pressure. The process is simple and easy to implement, and is convenient for large-scale popularization and application.

[0017] The preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention can efficiently prepare synthetic shale samples with adjustable physical property parameters and close to natural shale, solving the problems of difficult collection of natural shale, large sample discreteness and non-reusability.

[0018] The preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention is significantly superior to the traditional preparation method in terms of regulation accuracy. Under the same sample size and experimental conditions, the regulation of its key physical property parameters is convenient, and it more realistically simulates the characteristics of natural reservoirs.

[0019] The preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention is easy to operate, low in cost and greatly shortens the experimental period, providing an efficient and stable experimental basis for the development of unconventional oil and gas resources and the study of multi-physical field coupling.

[0020] A synthetic shale method with adjustable permeability, porosity and wettability provided by the present invention can realize the precise adjustment of the seepage characteristics and hydration swelling of synthetic shale by controlling the raw material ratio, compaction time and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a flowchart of the steps of the preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the present invention; Figure 2 is a schematic diagram of the raw materials and process flow of the preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the present invention; Figure 3 is a schematic diagram of the synthetic shale sample prepared by the preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the present invention; Figure 4 is a test chart of the wettability of the synthetic shale prepared by the preparation method of water-sensitive shale with adjustable permeability, porosity and wettability provided by the present invention; Figure 5 It is a graph showing the variation of the porosity of sample parameters with preparation conditions (compaction pressure, time) in the method for preparing water-sensitive shale with adjustable permeability, porosity, and wettability provided by the present invention; Figure 6 It is a graph showing the variation of the permeability of sample parameters with preparation conditions (compaction pressure, time) in the method for preparing water-sensitive shale with adjustable permeability, porosity, and wettability provided by the present invention. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0024] Figure 1 It shows a flowchart of the steps of the method for preparing water-sensitive shale with adjustable permeability, porosity, and wettability provided by the present invention. As Figure 1 shown, the method for preparing water-sensitive shale with adjustable permeability, porosity, and wettability provided by the embodiments of the present invention includes the following steps: S101, mix brittle minerals, clay minerals, and organic matter in a preset ratio and add a binder to obtain a first mixture.

[0025] In the embodiments of the present invention, the composition components of brittle minerals, clay minerals, and organic matter can be determined respectively according to the composition components of natural shale.

[0026] In the embodiments of the present invention, the brittle minerals include: one or more of quartz, plagioclase, potassium feldspar, and calcite.

[0027] In the embodiments of the present invention, the clay minerals include: one or more of illite, kaolinite, chlorite, and illite-smectite mixed layer.

[0028] In the embodiments of the present invention, the organic matter is humic acid and / or type II kerogen.

[0029] In the embodiments of the present invention, a binder with similar components can be selected according to the type of natural shale. At the same time, a suitable binder can be selected according to the mechanical strength and thermal stability of natural shale.

[0030] In the embodiments of the present invention, the binder is: unsaturated epoxy resin. Specifically, it can be two-component unsaturated epoxy resin (A / B). In the embodiments of the present invention, the content of the binder is 5%.

[0031] In the embodiments of the present invention, the preset ratio can be the mineral composition ratio of the shale to be studied, or the mineral composition ratio of the synthetic shale required for research preset in advance.

[0032] For example, when studying the mechanical properties of shale in a certain area, a preset ratio can be determined based on the actual mineral composition ratio of the shale in that area, so as to prepare synthetic shale with the same mineral composition ratio as the actual mineral composition ratio.

[0033] For another example, during the experimental study of spontaneous imbibition of shale, synthetic shale samples with different clay contents can be prepared to simulate natural shale conditions and explore the mechanism of spontaneous imbibition.

[0034] S102. Grind and screen the first mixture to obtain a second mixture.

[0035] In the embodiments of the present invention, the grinding method can use a ball mill or a vibratory mill.

[0036] In the case of using a ball mill, the grinding medium can be zirconia balls or steel balls (with a diameter of 3 - 10 mm). The rotation speed can be set to: 200 - 400 rpm. The time can be set to: 4 - 12 hours. The ball-to-material ratio can be set to: 2:1 to 5:1.

[0037] In the embodiments of the present invention, the screening process can use a vibrating screen, and the specific screening process can include: Coarse screening: First, pass through a 100 - mesh (150 μm) sieve to remove inadequately ground particles.

[0038] Fine screening: Select the sieve according to the target particle size.

[0039] Circular screening: The particles that do not pass through the sieve are returned to the grinding step for re - processing.

[0040] In the embodiments of the present invention, before grinding and screening the first mixture, large - sized raw materials can also be crushed (including jaw crushing or hammer crushing) to a particle size of <5 mm.

[0041] S103. Place the second mixture in a preset mold and press the second mixture under a preset pressure for a preset time to obtain synthetic shale.

[0042] In the embodiments of the present invention, the preset mold can be determined according to research needs. For example, if cylindrical synthetic shale samples are required for research, a cylindrical mold can be selected as the preset mold.

[0043] In the embodiments of the present invention, the corresponding relationship between the preset pressure, the preset time, and the permeability and porosity of the prepared synthetic shale can be obtained in advance, so as to determine the corresponding preset pressure and preset time based on the target permeability and target porosity.

[0044] In the embodiments of the present invention, considering that the corresponding relationships among the preset pressure, the preset time, and the permeability and porosity of the synthesized shale obtained under different raw material ratios are also different, therefore, during the preparation process, the permeability and porosity of the synthesized shale obtained can be continuously detected, and the preset pressure and the preset time can be continuously adjusted to prepare the synthesized shale that meets the target permeability and target porosity.

[0045] In the embodiments of the present invention, the clay content of the shale can be adjusted by adjusting the mass percentage (0%-46%) of the clay mineral, so as to adjust the wettability of the synthesized shale obtained. The permeability and porosity of the synthesized shale obtained can be adjusted by adjusting the pressing time and pressure.

[0046] The method for preparing a water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention realizes the flexible adjustment of the clay content, porosity and permeability by precisely controlling the raw material ratio, compaction time and pressure. The process is simple and easy to implement, and is convenient for large-scale popularization and application.

[0047] The method for preparing a water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention can efficiently prepare a synthesized shale sample with adjustable physical property parameters and close to natural shale, and solves the problems of difficult collection of natural shale, large discreteness of samples and non-reusability.

[0048] The method for preparing a water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention is significantly superior to the traditional preparation method in terms of regulation accuracy. Under the same sample size and experimental conditions, the regulation of its key physical property parameters is convenient, and it more realistically simulates the characteristics of natural reservoirs.

[0049] The method for preparing a water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention is easy to operate, low in cost and greatly shortens the experimental period, providing an efficient and stable experimental basis for the development of unconventional oil and gas resources and the research on multi-physical field coupling.

[0050] A method for synthesizing shale with adjustable permeability, porosity and wettability provided by the present invention can realize the precise adjustment of the seepage characteristics and hydration swelling of the synthesized shale by controlling the raw material ratio, compaction time and pressure.

[0051] In an optional embodiment, the method further includes: S100, obtaining the composition of the natural shale to be studied; determining the preset ratio according to the composition of the natural shale.

[0052] In the embodiments of the present invention, the preset ratio of the synthesized shale can be obtained according to the mineral composition ratio of the natural shale to be studied.

[0053] Specifically, shale samples in the formation can be selected according to research objectives (such as oil and gas exploration, geological evolution analysis), avoiding weathered or polluted areas. Use a geological hammer, core sampler or cutter to obtain fresh samples, avoid contamination, remove surface contaminants (such as soil), and dry them at 60 °C for 24 hours. Crush the samples to a particle size of <75 μm (200 mesh) using a jaw crusher or ball mill to ensure homogeneity.

[0054] Use X-ray diffraction method, scanning electron microscope-energy dispersive spectrometer combined method or thin section polarized light microscope method to determine the mineral composition of natural shale samples.

[0055] In the embodiments of the present invention, the pore structure and permeability of natural shale can also be analyzed to determine the target permeability and porosity.

[0056] In an alternative embodiment, step S103 includes: S1031, adjust the preset pressure and preset time respectively within the preset pressure range and the preset time range.

[0057] The preset pressure range is: 60 - 180 MPa, and the preset time range is: 1 - 15 hours.

[0058] S1032, after each adjustment is completed, press the synthesized shale after the previous pressing according to the adjusted pressure and time.

[0059] S1033, after each pressing is completed, test the permeability and porosity of the synthesized shale. When the permeability and porosity of the rock reach the target permeability and target porosity, use the synthesized shale obtained by the current pressing as the synthesized shale.

[0060] In the embodiments of the present invention, considering that in the case of different raw material ratios, the corresponding relationships between the preset pressure, the preset time, and the permeability and porosity of the prepared synthesized shale are also different. Therefore, during the preparation process, the permeability and porosity of the prepared synthesized shale can also be continuously detected, and the preset pressure and preset time can be continuously adjusted to prepare a synthesized shale that meets the target permeability and target porosity.

[0061] In an alternative embodiment, the method further includes: S1, determine the target contact angle based on the target wettability.

[0062] S2, determine the clay content in the first mixture based on the target contact angle and the previously determined relationship between the contact angle and the clay content.

[0063] S3, determine the mass percentage of clay minerals and the preset ratio based on the clay content.

[0064] In the embodiments of the present invention, during the research process, it may be necessary to prepare synthetic shale with a target wettability. In this case, based on the pre-determined relationship between the contact angle and the clay content, the clay content of the synthetic shale can be determined, and then the preset ratio can be determined.

[0065] In the embodiments of the present invention, when the research target is a certain natural shale, the corresponding preset ratio is determined according to the mineral composition of the natural shale, and the wettability of the synthetic shale prepared according to the preset ratio is consistent with that of the natural shale.

[0066] Based on the same inventive concept, the embodiments of the present invention also provide a synthetic shale prepared by using the method for preparing water-sensitive shale with adjustable permeability, porosity and wettability described in any of the above embodiments.

[0067] The following further illustrates the method for synthesizing shale according to the present invention through implementation examples.

[0068] Implementation Example 1: Select the shale of the Daanzhai section in the Sichuan Basin of the Jurassic as the target, mix mineral powders according to the ratio in Table 1, use 5% epoxy resin as the binder, and compact under a pressure of 100 MPa for 10 hours to obtain synthetic shale with a clay content of 46%, a porosity of 5.2%, and a permeability of 7.1 md.

[0069] Table 1 Raw material composition

[0070] In the embodiments of the present invention, the raw materials and technological processes used for preparing synthetic shale are as Figure 2 shown.

[0071] Example 2: On the basis of the raw material composition shown in Table 1, while keeping the organic matter content unchanged, the clay mineral content is adjusted to: 0%, 10%, 20%, 30%, 40% and 46%, and 6 groups of synthetic shale are prepared. The prepared synthetic shale samples are as Figure 3 shown.

[0072] For the 6 groups of synthetic shale prepared, a contact angle measuring instrument is used to evaluate their wettability. The wettability test diagram is as Figure 4 shown. It can be seen that the contact angles of synthetic shale with different clay contents are different, and the contact angle of synthetic shale with a clay content of 46% (the same as that of natural shale) is close to the contact angle of Tianyan shale. It can be seen that the wettability of the synthetic shale prepared by using the method for preparing water-sensitive shale with adjustable permeability, porosity and wettability provided by the embodiments of the present invention is consistent with that of natural shale.

[0073] Example 3: Based on the raw material composition shown in Table 1, adjust the compaction pressure to 60 MPa and compact for 1 hour to obtain synthetic shale with a porosity of 17.2% and a permeability of 430 md.

[0074] Example 4: Based on the raw material composition shown in Table 1, adjust the compaction pressure to 100 MPa and compact for 5 hours to obtain synthetic shale with a porosity of 10.4% and a permeability of 40 md.

[0075] Example 5: Based on the raw material composition shown in Table 1, adjust the compaction pressure to 180 MPa and compact for 15 hours to obtain synthetic shale with a porosity of 4.7% and a permeability of 6.8 md.

[0076] In Examples 3, 4, and 5, different synthetic shale samples were prepared by using different pressures and times based on the raw material composition shown in Table 1, and the porosity and permeability of each synthetic shale sample were analyzed to obtain the Figure 5 and Figure 6 variation curve graphs of the sample parameters (porosity, permeability) with the preparation conditions (compaction pressure, time) as shown, where Figure 5 represents the variation curve graph of the porosity with the preparation conditions (compaction pressure, time), Figure 6 represents the variation curve graph of the permeability with the preparation conditions (compaction pressure, time). It can be seen that as the compaction pressure increases and the compaction time prolongs, the porosity and permeability of the synthetic shale decrease accordingly.

[0077] In the actual application process, during the research on natural shale, when the porosity and permeability are determined, the compaction pressure and compaction time can be adjusted multiple times during the preparation of synthetic shale until the porosity and permeability of the prepared synthetic shale are consistent with those of natural shale.

[0078] In the actual application process, if it is necessary to adjust the porosity and permeability of the synthetic shale to specific values, then the compaction pressure and compaction time are adjusted multiple times during the preparation of synthetic shale until the porosity and permeability of the prepared synthetic shale reach the specific values. It is also possible to prepare multiple groups of synthetic shale based on the preset ratio of synthetic shale and different compaction pressures and compaction times, fit the corresponding relationship between the compaction pressure, compaction time, and the permeability of the synthetic shale, and fit the corresponding relationship between the compaction pressure, compaction time, and the porosity of the synthetic shale, so as to determine the compaction pressure and compaction time required to prepare synthetic shale with specific porosity and specific permeability.

[0079] In the embodiments of the present invention, mercury intrusion porosimetry and nitrogen adsorption method are combined to characterize the pore structure.

[0080] Example of Implementation 6: Under the condition of the same raw materials, by adjusting the clay content to 40%, adjusting the compaction pressure to 180 MPa, and compacting for 15 hours, synthetic shale with a porosity of 4.72% and a permeability of 6.83 md was obtained.

[0081] Current synthetic shale focuses on restoring the mechanical properties of real rocks. However, its seepage characteristics are affected by pore structure and wetting characteristics, making it difficult to be used for seepage experiments. In particular, it cannot restore the influence of clay hydration on seepage characteristics. In the present invention, mineral powder with the same particle size as that of natural shale components is selected as the raw material for mineral components, humic acid is selected as the raw material for the organic matter component of the artificial sample, and unsaturated epoxy resin is selected as the binder. By adjusting the pressing time and pressure, the same microscopic pore structure and pore size distribution characteristics as those of natural rocks are obtained; at the same time, by changing the mineral components, the wetting characteristics and hydration swelling characteristics of the artificial sample are adjusted, restoring the pore structure and wetting characteristics of the natural sample, and greatly improving the comparability between synthetic shale and natural shale.

[0082] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0083] Finally, it should also be noted that in the present invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0084] The above has introduced in detail a method for preparing a water-sensitive shale with adjustable permeability, porosity and wettability provided by the present invention. Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for preparing water-sensitive shale with adjustable permeability, porosity and wettability, characterized in that: The method comprises: Mixing brittle minerals, clay minerals and organic matter in a preset ratio and adding a binder to obtain a first mixture; Grinding and screening the first mixture to obtain a second mixture; The second mixture is placed in a preset mold, and the second mixture is pressed under a preset pressure and for a preset time to obtain synthetic shale.

2. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The method further comprises: Obtain the composition of the natural shale to be studied; The preset ratio is determined according to the composition of the natural shale.

3. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The second mixture is pressed under a preset pressure and for a preset time to obtain synthetic shale, comprising: Within the preset pressure range and the preset time range, respectively adjusting the preset pressure and the preset time; After each adjustment is completed, the synthetic shale after the previous pressing is pressed according to the adjusted pressure and time; After each pressing is completed, the permeability and porosity of the synthetic shale are tested. When the permeability and porosity of the rock reach the target permeability and target porosity, the synthetic shale obtained by the current pressing is regarded as the synthetic shale.

4. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 3, characterized in that: The preset pressure range is: 60-180MPa, and the preset time range is: 1-15 hours.

5. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The method further comprises: determining a target contact angle based on the target wettability; determining a clay content in the first mixture based on a target contact angle and a predetermined relationship between contact angle and clay content; The mass percentage of the clay mineral and the preset ratio are determined based on the clay content.

6. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The brittle minerals include one or more of quartz, plagioclase, potassium feldspar and calcite.

7. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The clay minerals include: one or more of illite, kaolinite, chlorite and illite-montmorillonite mixed layer.

8. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The organic matter is humic acid and / or Type II kerogen.

9. The method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to claim 1, characterized in that: The binder is: unsaturated epoxy resin.

10. A synthetic shale prepared by the method for preparing water-sensitive shale with adjustable permeability, porosity and wettability according to any one of claims 1 to 9.

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