Shale imbibition capacity testing method and device

Abstract

The embodiment of the invention discloses a shale imbibition capacity testing method and device. The method comprises the following steps: aiming at a core sample acquired from a target shale reservoir section, determining an initial core matrix peak area and an initial microfracture peak area of the core sample; determining a test temperature and a test confining pressure, and determining a total imbibition amount, a target rock core matrix peak area and a target micro-fracture peak area of the rock core sample at a target time when the rock core sample is at the test temperature and the test confining pressure; according to the initial rock core matrix peak area, the initial micro-fracture peak area, the total imbibition amount, the target rock core matrix peak area and the target micro-fracture peak area, the matrix dynamic imbibition amount and the micro-fracture dynamic imbibition amount of the rock core sample are determined. According to the technical scheme provided by the embodiment of the invention, the imbibition capability of the matrix and the microcrack of the shale is tested.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of petroleum and natural gas technology, and in particular to a shale permeability testing method and device. Background Art

[0002] Compared with conventional sandstone reservoirs, shale usually develops multi-scale micro-nano pores, and its matrix and microfracture pores are the main storage space of shale. The imbibition ability of fluid in shale matrix and microfracture pores can reflect the flow ability of fluid, which plays an important guiding role in finding "sweet spots" in oil exploration and development.

[0003] At present, the key technology for the large-scale development of shale gas is to realize multi-stage and multi-cluster volume fracturing transformation of horizontal wells by letting tens of thousands of cubic meters of water-based fracturing fluid enter the formation. Large-scale water-based fracturing fluid and complex fracture network system make the interaction between shale and fracturing fluid more prominent and far-reaching. Different from conventional sandstone reservoirs, shale has significant differences in reservoir characteristics, fracturing technology, fracture area, etc. Shale gas wells show completely different post-fracturing flowback characteristics. A large number of mine statistics show that shale gas wells have the abnormal phenomenon of "low flowback rate and high production capacity". To explain the special flowback phenomenon of shale, the first thing to study is the shale water phase imbibition mechanism. The shale water phase imbibition capacity directly affects the flowback rate of shale gas wells. The shale water phase imbibition capacity can be indirectly used to predict and evaluate the production capacity of shale gas wells. The shale water phase imbibition capacity is jointly determined by the shale matrix and microcracks.

[0004] However, since shale contains multi-component minerals, shale undergoes physical and chemical reactions with water, and the pores of the shale matrix and microcracks are in a dynamically changing state, it is very difficult to test the water phase permeability of shale. Currently, there is no method to test the permeability of shale matrix and microcracks, which needs to be solved. Summary of the invention

[0005] The embodiment of the present invention provides a method and device for testing the imbibition capacity of shale, which realizes the testing of the imbibition capacity of the matrix and micro-cracks of shale.

[0006] According to one aspect of the present invention, a method for testing shale imbibition capacity is provided, which may include:

[0007] For a core sample collected from a target shale reservoir section, determining an initial core matrix peak area and an initial microfracture peak area of ​​the core sample;

[0008] Determine the test temperature and the test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determine the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area;

[0009] The matrix dynamic imbibition and microfracture dynamic imbibition of the core sample were determined according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

[0010] According to another aspect of the present invention, a shale imbibition capacity testing device is provided, which may include:

[0011] An initial micro-fracture peak area determination module is used to determine an initial core matrix peak area and an initial micro-fracture peak area of ​​a core sample collected from a target shale reservoir section;

[0012] A target microcrack peak area determination module is used to determine the test temperature and the test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determine the total amount of imbibition of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area;

[0013] The microcrack dynamic imbibition amount determination module is used to determine the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area.

[0014] The technical solution of the embodiment of the present invention determines the initial core matrix peak area and initial microcrack peak area of ​​the core sample collected from the target shale reservoir section; determines the test temperature and test confining pressure, and when the core sample is at the test temperature and test confining pressure, determines the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area; and determines the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area, and the target microcrack peak area. The above technical solution uses the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area, and the target microcrack peak area as the determining factors of the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample, thereby realizing the test of the imbibition capacity of the matrix and microcracks of shale.

[0015] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a flow chart of a shale permeability testing method provided according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of real-time testing of shale permeability in a shale permeability testing method provided according to an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a target T2 spectrum curve in a shale permeability testing method provided according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of another target T2 spectrum curve in a shale permeability testing method provided according to an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of an initial T2 spectrum curve in a shale permeability testing method provided in an embodiment of the present invention;

[0022] Figure 6 is a flow chart of another shale imbibition capacity testing method provided according to an embodiment of the present invention;

[0023] Figure 7 is a flow chart of another shale permeability testing method provided according to an embodiment of the present invention;

[0024] Figure 8 is a structural diagram of an optional example of another shale permeability testing method provided according to an embodiment of the present invention;

[0025] Fig. 9 It is a structural block diagram of a shale permeability testing device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The situations of "target", "original", etc. are similar and will not be repeated here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Figure 1 1 is a flow chart of a shale permeability testing method provided in an embodiment of the present invention. This embodiment is applicable to the case of shale permeability testing. The method can be performed by a shale permeability testing device provided in an embodiment of the present invention, which can be implemented by software and / or hardware, and can be integrated in an electronic device, which can be various user terminals or servers.

[0029] See also Figure 1 The method of the embodiment of the present invention specifically includes the following steps:

[0030] S110. For a core sample collected from a target shale reservoir segment, determine an initial core matrix peak area and an initial microfracture peak area of ​​the core sample.

[0031] The target shale reservoir section is the shale reservoir section for which the imbibition capacity is to be tested. The initial core matrix peak area can be expressed as the total value of the hydrogen atom signal of the matrix part in the core sample that has not been tested. The initial microcrack peak area can be expressed as the total value of the hydrogen atom signal of the microcrack part in the core sample that has not been tested.

[0032] In an embodiment of the present invention, shale can be collected from a target shale layer section, and the shale can be made into a core sample for testing the imbibition capacity of the shale in the target shale reservoir section. For example, a downhole core of the target shale reservoir section can be collected through a target collection well that can collect shale in the target shale reservoir section, and the downhole core can be made into a core sample of a preset size. It should be noted that after the core sample is collected, the core sample can also be dried to a constant weight to improve the accuracy of the shale imbibition capacity test.

[0033] For example, a collection well numbered QC-1 can be used as a target collection well, and actual downhole cores in the middle of the target shale reservoir section at 2000-2060 m from the target collection well can be collected. The downhole cores can be made into standard cores with a diameter of 2.5 cm and a length of 5 cm. The standard cores can be placed in a 100° C. oven and dried to constant weight, and the standard cores dried to constant weight can be used as core samples.

[0034] In the embodiment of the present invention, after the core sample is collected, the imbibition area of ​​the core sample can also be calculated according to the end face size of the core sample. For example, the imbibition area of ​​a core sample with a diameter of 2.5 cm and a length of 5 cm may be 4.9 cm. 2 The test measurement length can also be determined based on the length of the core sample, for example, the test measurement length of a core sample with a diameter of 2.5 cm and a length of 5 cm may be 5 cm.

[0035] For example, for the core sample collected from the target shale reservoir section, the core sample that has not been tested can be scanned by a nuclear magnetic resonance device to obtain the T2 spectrum curve of the core sample, and the initial core matrix peak area and the initial microcrack peak area of ​​the core sample can be determined based on the T2 spectrum curve. For example, the initial core matrix peak area that can be determined is 5860, and the initial microcrack peak area is 242. In the embodiment of the present invention, the method for determining the initial core matrix peak area and the initial microcrack peak area of ​​the core sample is not specifically limited.

[0036] S120, determining a test temperature and a test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determining the total imbibition amount of the core sample at a target time, a target core matrix peak area, and a target microcrack peak area.

[0037] Among them, the test temperature is the temperature that needs to be reached when the core sample is heated during the test. The test confining pressure is the confining pressure that needs to be reached when the core sample is loaded with confining pressure during the test. The total amount of imbibition is the total amount of self-imbibition liquid such as fracturing fluid that is imbibed by the core sample. The target core matrix peak area can be expressed as the total value of the hydrogen atom signal of the matrix part in the core sample at the target time. The target microcrack peak area can be expressed as the total value of the hydrogen atom signal of the microcrack part in the core sample at the target time.

[0038] In the embodiment of the present invention, the test temperature can be determined according to the preset temperature, and the test confining pressure can be determined according to the preset confining pressure; the test temperature and the test confining pressure can also be determined according to the collection well parameters of the target collection well. In the embodiment of the present invention, the method for determining the test temperature and the test confining pressure is not specifically limited. Among them, the collection well parameters are parameters related to the target collection well and / or the area where the target collection well is located.

[0039] In an embodiment of the present invention, the test temperature and the test confining pressure can be determined, and the core sample can be experimentally tested based on the test temperature and the test confining pressure; when the core sample is at the test temperature and the test confining pressure, the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area are determined.

[0040] It should be noted that the target time can be the time when the core sample is at the test temperature and the test confining pressure; the target time can be a target moment, for example, the target moment can be a preset moment, or a moment at a preset time interval after the preset time, for example, when the preset time interval is 0.5 hours, the target moment can be a moment at a preset time interval after the preset time; the target time can be a target time period, for example, the target time period can be a preset time period, or a time period corresponding to a preset time length after the preset time, for example, when the preset time length is 0.5 hours, the target time period can be a time period corresponding to 0.5 hours after the preset time; the number of target times can be one or more, for example, the target time can be a moment at each preset time interval after the preset time. Among them, the preset time can be the time when the test starts, and it can also be understood as the time when the core sample starts to absorb the fracturing fluid.

[0041] In the embodiment of the present invention, the method for determining the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target micro-fracture peak area is not specifically limited.

[0042] S130, determining the matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area, and the target microfracture peak area.

[0043] The matrix dynamic imbibition is the imbibition amount of self-imbibition liquids such as fracturing fluids in the matrix part of the core sample at the target time. The microfracture dynamic imbibition is the imbibition amount of self-imbibition liquids such as fracturing fluids in the microfracture part of the core sample at the target time.

[0044] In the embodiment of the present invention, there is no specific limitation on the method of determining the matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample based on the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

[0045] Exemplarily, when the target time is a moment at intervals of 0.5 hours after a preset time, that is, when there are multiple target times, the matrix dynamic imbibition and microfracture dynamic imbibition of the core sample corresponding to the target time can be determined according to the initial core matrix peak area, initial microfracture peak area, total imbibition, target core matrix peak area, and target microfracture peak area corresponding to each target time, so as to obtain the change in the matrix dynamic imbibition and microfracture dynamic imbibition over time, which can improve the accuracy of shale production capacity prediction based on the dynamic matrix dynamic imbibition and microfracture dynamic imbibition of the core sample.

[0046] In the embodiments of the present invention, see Figure 2 , the target time can also be the real-time time after the core sample reaches the test temperature and the test confining pressure, that is, the total imbibition amount of the core sample, the target core matrix peak area and the target microcrack peak area can be determined in real time when the core sample is at the test temperature and the test confining pressure; according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area, the matrix dynamic imbibition amount and the microcrack dynamic imbibition amount of the core sample can be determined in real time to realize the real-time online test of the shale matrix and microcrack imbibition capacity, so that the on-site engineers can predict the production capacity and evaluate the sweet spot according to the shale imbibition capacity obtained from the above test.

[0047] In the embodiments of the present invention, the matrix dynamic imbibition and micro-fracture dynamic imbibition of the core sample can be determined, thereby achieving quantitative characterization of the shale imbibition capacity and clarifying the contribution of different pore types to the shale imbibition capacity, thereby solving the problem of conventional spontaneous imbibition experimental testing methods that cannot simultaneously test the matrix dynamic imbibition and micro-fracture dynamic imbibition, and providing a new experimental research method for studying shale imbibition capacity testing.

[0048] The technical solution of the embodiment of the present invention determines the initial core matrix peak area and initial microcrack peak area of ​​the core sample collected from the target shale reservoir section; determines the test temperature and test confining pressure, and when the core sample is at the test temperature and test confining pressure, determines the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area; and determines the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area, and the target microcrack peak area. The above technical solution uses the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area, and the target microcrack peak area as the determining factors of the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample, thereby realizing the test of the imbibition capacity of the matrix and microcracks of shale.

[0049] An optional technical solution, when the core sample is at a test temperature and a test confining pressure, determines a target core matrix peak area and a target microcrack peak area of ​​the core sample at a target time, including: when the core sample is at a test temperature and a test confining pressure, determining a target T2 spectrum curve of the core sample at a target time; based on the target T2 spectrum curve, determining a target core matrix peak area and a target microcrack peak area of ​​the core sample at a target time.

[0050] The target T2 spectrum curve is a T2 spectrum curve of the core sample obtained by scanning the core sample with a nuclear magnetic resonance device at a target time.

[0051] In an embodiment of the present invention, when the core sample is at a test temperature and a test confining pressure, the core sample can be scanned by a nuclear magnetic resonance device at a target time to obtain a target T2 spectrum curve corresponding to the core sample at the target time; the peak areas corresponding to the peaks in the target T2 spectrum curve are determined; the first peak on the left in the target T2 spectrum curve is taken as the peak corresponding to the matrix part of the core sample, and the other peaks except the first peak on the left in the target T2 spectrum curve are taken as the peaks corresponding to the microcrack part of the core sample; the peak area of ​​the peak corresponding to the matrix part is taken as the target core matrix peak area of ​​the core sample, and the peak area of ​​the peak corresponding to the microcrack part is taken as the target microcrack peak area of ​​the core sample.

[0052] For example, see Figure 3 and Figure 4 , when the target times are the moments corresponding to the intervals of 5 hours and 10 hours after the preset time, and when the core samples are at the test temperature and the test confining pressure, the core samples can be scanned by the nuclear magnetic resonance device at each target time to obtain the target T2 spectrum curves corresponding to the core samples at each target time; for each target T2 spectrum curve in the target T2 spectrum curve corresponding to each target time, the peak area corresponding to each peak in the target T2 spectrum curve is determined; the first peak on the left in the target T2 spectrum curve is taken as the peak corresponding to the matrix part of the core sample, and the other peaks except the first peak on the left in the target T2 spectrum curve are taken as the peaks corresponding to the microcrack part of the core sample; the peak area of ​​the peak corresponding to the matrix part is taken as the target core matrix peak area of ​​the core sample, and the peak area of ​​the peak corresponding to the microcrack part is taken as the target microcrack peak area of ​​the core sample.

[0053] In an embodiment of the present invention, by determining the target core matrix peak area and target microcrack peak area of ​​the core sample at the target time based on the target T2 spectrum curve of the core sample at the target time, the accuracy of the obtained target core matrix peak area and target microcrack peak area can be improved.

[0054] Another optional technical solution is to determine the initial core matrix peak area and the initial microcrack peak area of ​​the core sample, including: determining the initial T2 spectrum curve of the core sample, and determining the peak area corresponding to at least one peak in the initial T2 spectrum curve; determining the initial core matrix peak area and the initial microcrack peak area of ​​the core sample according to the peak area corresponding to at least one peak.

[0055] The initial T2 spectrum curve is a T2 spectrum curve of a core sample obtained by scanning an untested core sample using a nuclear magnetic resonance device.

[0056] In the embodiments of the present invention, see Figure 5 , scan the untested core sample by nuclear magnetic resonance equipment to obtain the initial T2 spectrum curve of the core sample; determine the peak areas corresponding to each peak in the initial T2 spectrum curve; take the first peak on the leftmost side of the initial T2 spectrum curve as the peak corresponding to the matrix part of the core sample, and take the other peaks except the first peak on the leftmost side of the initial T2 spectrum curve as the peaks corresponding to the microcrack part of the core sample; take the peak area of ​​the peak corresponding to the matrix part as the initial core matrix peak area of ​​the core sample, and take the peak area of ​​the peak corresponding to the microcrack part as the initial microcrack peak area of ​​the core sample.

[0057] In an embodiment of the present invention, by determining the initial core matrix peak area and initial microcrack peak area of ​​the core sample based on the initial T2 spectrum curve of the core sample, the accuracy of the obtained initial core matrix peak area and initial microcrack peak area can be improved.

[0058] Another optional technical solution is to determine the matrix dynamic imbibition and microfracture dynamic imbibition of the core sample according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area, including: determining the matrix imbibition peak area ratio according to the initial core matrix peak area, the initial microfracture peak area, the target core matrix peak area and the target microfracture peak area; determining the microfracture imbibition peak area ratio according to the initial core matrix peak area, the initial microfracture peak area, the target core matrix peak area and the target microfracture peak area; determining the matrix dynamic imbibition of the core sample according to the total imbibition amount and the matrix imbibition peak area ratio; determining the microfracture dynamic imbibition of the core sample according to the total imbibition amount and the microfracture imbibition peak area ratio.

[0059] The matrix imbibition peak area ratio can represent the ratio of the area change of the core matrix peak area corresponding to the matrix part of the core sample before and after the test. The microcrack imbibition peak area ratio can represent the ratio of the area change of the microcrack peak area corresponding to the microcrack part of the core sample before and after the test.

[0060] In the embodiment of the present invention, the matrix imbibition peak area ratio can be determined according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area and the target microcrack peak area. For example, the formula Determine the ratio of matrix absorption peak area. m is the dimensionless matrix absorption peak area ratio; S m is the dimensionless target core matrix peak area; S f is the dimensionless target microcrack peak area; S mo is the dimensionless initial core matrix peak area; S fo is the dimensionless initial microcrack peak area.

[0061] In the embodiment of the present invention, the microcrack imbibition peak area ratio can be determined according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area and the target microcrack peak area. In combination with the above example, for example, the formula Determine the microcrack imbibition peak area ratio. f is the dimensionless ratio of microcrack imbibition peak area.

[0062] In the embodiment of the present invention, the matrix dynamic imbibition amount of the core sample can be determined according to the total imbibition amount and the ratio of the matrix imbibition peak area. Combining the above examples, for example, the formula V m =V·P m Determine the matrix dynamic imbibition of the core sample, V m The larger the value, the stronger the matrix imbibition capacity of the core sample. m is the dynamic absorption capacity of the matrix, in cm 3 ; V is the total amount of imbibition, in cm 3 .

[0063] In the embodiment of the present invention, the dynamic imbibition amount of microfractures of the core sample can be determined according to the total imbibition amount and the ratio of the microfracture imbibition peak area. Combining the above examples, for example, the formula V f =V·P f Determine the matrix dynamic imbibition of the core sample, V f The larger the value, the stronger the microfracture permeability of the core sample. f is the dynamic seepage of microcracks, in cm 3 .

[0064] In an embodiment of the present invention, the dynamic imbibition amount of the matrix and the dynamic imbibition amount of the microcracks of the core sample can be determined according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area, thereby achieving a more accurate test of the imbibition capacity of the shale matrix and microcracks.

[0065] Figure 6 It is a flow chart of another shale permeability test method provided in an embodiment of the present invention. This embodiment is optimized based on the above-mentioned technical solutions. In this embodiment, optionally, determining the test temperature and the test confining pressure includes: obtaining the collection well parameters of the target collection well, wherein the target collection well is the collection well from which the core sample is collected; and determining the test temperature and the test confining pressure according to the collection well parameters. Among them, the explanations of the terms that are the same or corresponding to the above-mentioned embodiments are not repeated here.

[0066] See also Figure 6 The method of this embodiment may specifically include the following steps:

[0067] S210. For a core sample collected from a target shale reservoir segment, determine an initial core matrix peak area and an initial microfracture peak area of ​​the core sample.

[0068] S220, obtaining collection well parameters of a target collection well, wherein the target collection well is a collection well from which a core sample is collected.

[0069] In an embodiment of the present invention, the acquisition well parameters may include, for example, the core formation temperature, formation pore pressure, maximum horizontal principal stress, minimum horizontal principal stress, vertical stress and / or effective stress coefficient of the target acquisition well. For example, the core formation temperature of the target acquisition well in the acquisition well parameters that can be obtained is 60°C, the formation pore pressure is 20MPa, the maximum horizontal principal stress is 36MPa, the minimum horizontal principal stress is 28MPa, the vertical stress is 30MPa and the effective stress coefficient is 0.5. Among them, the core formation temperature can be understood as the formation temperature of the target shale reservoir section where the core sample is collected; the formation pore pressure can be understood as the formation pore pressure of the target shale reservoir section; the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient can also be the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient of the target shale reservoir section respectively; the vertical stress can also be understood as the vertical stress.

[0070] It should be noted that the acquisition well parameters can be determined by performing logging operations on the target acquisition well and according to the rock mechanics parameters of the area where the target acquisition well is located.

[0071] S230. Determine the test temperature and test confining pressure according to the acquisition well parameters.

[0072] In the embodiment of the present invention, the method of determining the test temperature and the test confining pressure according to the acquisition well parameters is not specifically limited.

[0073] S240. When the core sample is at a test temperature and a test confining pressure, determine the total imbibition amount of the core sample at a target time, a target core matrix peak area, and a target microcrack peak area.

[0074] S250, determining the matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

[0075] In an embodiment of the present invention, before determining the test temperature and the test confining pressure, the porosity and permeability of the core sample can be tested respectively by a helium porosity automatic tester and an ultra-low permeability tester. For example, the porosity of the core sample tested is 6.8%, and the permeability is 0.012 mD. In the case of subsequent demand for testing the imbibition capacity of other shales, if the acquisition well parameters, porosity and permeability corresponding to the other shales are consistent with or similar to the acquisition well parameters, porosity and permeability of the core sample, the matrix dynamic imbibition and micro-fracture dynamic imbibition of the core sample can be directly used as the matrix dynamic imbibition and micro-fracture dynamic imbibition of other shales, thereby saving resource consumption for testing the imbibition capacity of shale.

[0076] The technical solution of the embodiment of the present invention obtains the collection well parameters of the target collection well, wherein the target collection well is the collection well from which the core sample is collected; and determines the test temperature and the test confining pressure according to the collection well parameters. The above technical solution, by determining the test temperature and the test confining pressure according to the collection well parameters, can realize the use of factors related to the target collection well as influencing factors for the shale imbibition capacity test, solving the problem faced by conventional spontaneous imbibition experimental test methods that the influence of multiple factors cannot be considered at the same time. The test method is simple and feasible to operate, reduces the test cost, and the test results are more in line with the actual situation, thereby improving the accuracy of the shale imbibition capacity test.

[0077] An optional technical solution, wherein the acquisition well parameters include the core formation temperature of the target acquisition well, and at least one of the formation pore pressure, maximum horizontal principal stress, minimum horizontal principal stress, vertical stress and effective stress coefficient of the target acquisition well; determining the test temperature and the test confining pressure according to the acquisition well parameters, including: taking the core formation temperature as the test temperature; and determining the test confining pressure according to at least one of the formation pore pressure, maximum horizontal principal stress, minimum horizontal principal stress, vertical stress and effective stress coefficient.

[0078] In an embodiment of the present invention, the core formation temperature can be used as the test temperature. For example, when the core formation temperature is 60°C, the test temperature is 60°C, and the test confining pressure can be determined based on at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress, and the effective stress coefficient, so that the test temperature of the shale permeability test is more consistent with the actual formation temperature, and the test confining pressure of the shale permeability test is more consistent with the actual formation confining pressure, thereby further improving the accuracy of the shale permeability test.

[0079] Based on the above scheme, another optional technical scheme is to determine the test confining pressure according to at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient, including: determining the vertical effective stress according to at least one of the vertical stress, the effective stress coefficient and the formation pore pressure; determining the maximum horizontal effective principal stress according to at least one of the maximum horizontal principal stress, the effective stress coefficient and the formation pore pressure; determining the minimum horizontal effective principal stress according to at least one of the minimum horizontal principal stress, the effective stress coefficient and the formation pore pressure; determining the test confining pressure according to the vertical effective stress, the minimum horizontal effective principal stress and the maximum horizontal effective principal stress.

[0080] Among them, the vertical effective stress can be understood as the effective stress of the target shale reservoir section in the vertical direction. The maximum horizontal effective principal stress can be understood as the maximum effective principal stress of the target shale reservoir section in the horizontal direction. The minimum horizontal effective principal stress can be understood as the minimum effective principal stress of the target shale reservoir section in the horizontal direction.

[0081] In the embodiment of the present invention, the vertical effective stress can be determined according to the vertical stress, the effective stress coefficient and the formation pore pressure; the maximum horizontal effective principal stress can be determined according to the maximum horizontal principal stress, the effective stress coefficient and the formation pore pressure; the minimum horizontal effective principal stress can be determined according to the minimum horizontal principal stress, the effective stress coefficient and the formation pore pressure; the test confining pressure can be determined according to the vertical effective stress, the minimum horizontal effective principal stress and the maximum horizontal effective principal stress. For example, the formula σ z '=σ z -αP p , determine the vertical effective stress; it can be determined by the formula σ H '=σ H -αP p Determine the maximum horizontal effective principal stress; it can be determined by the formula σ h '=σ h -αP p Determine the minimum horizontal effective principal stress; it can be determined by the formula σ c =(σ z '+σ H '+σh ') / 3 to determine the test confining pressure. Combined with the above-mentioned acquisition well parameter example, it can be calculated that the vertical effective stress is 20Mpa, the maximum horizontal effective principal stress is 16Mpa, the minimum horizontal effective principal stress is 18MPa, and the test confining pressure is 18MPa. Among them, σ z ' is the vertical effective stress, in MPa; σ z is the vertical stress, in MPa; α is the effective stress coefficient, which can be a decimal; P p is the formation pore pressure, in MPa; σ H ' is the maximum horizontal effective principal stress, in MPa; σ H is the maximum horizontal principal stress, in MPa; σ h ' is the minimum horizontal effective principal stress, in MPa; σ h is the minimum horizontal principal stress, in MPa; σ c is the test confining pressure, in MPa.

[0082] In the embodiment of the present invention, there is no specific limitation on the method of determining the vertical effective stress according to at least one of the vertical stress, the effective stress coefficient and the formation pore pressure; there is no specific limitation on the method of determining the maximum horizontal effective principal stress according to at least one of the maximum horizontal principal stress, the effective stress coefficient and the formation pore pressure; there is no specific limitation on the method of determining the minimum horizontal effective principal stress according to at least one of the minimum horizontal principal stress, the effective stress coefficient and the formation pore pressure; there is no specific limitation on the method of determining the test confining pressure according to the vertical effective stress, the minimum horizontal effective principal stress and the maximum horizontal effective principal stress.

[0083] In the embodiment of the present invention, the test confining pressure can be determined according to at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient, so as to improve the accuracy of the obtained test confining pressure.

[0084] Figure 7 It is a flow chart of another shale imbibition capacity testing method provided in an embodiment of the present invention. This embodiment is optimized based on the above-mentioned technical solutions. In this embodiment, optionally, when the core sample is at the test temperature and the test confining pressure, the total imbibition amount of the core sample at the target time is determined, including: when the core sample is at the test temperature and the test confining pressure, the initial liquid level height of the fracturing fluid in the metering tube connected to the core sample at the initial time is determined; based on the initial liquid level height, the total imbibition amount of the core sample at the target time is determined. Among them, the explanations of the terms that are the same or corresponding to the above-mentioned embodiments are not repeated here.

[0085] See also Figure 7The method of this embodiment may specifically include the following steps:

[0086] S310, for a core sample collected from a target shale reservoir segment, determine an initial core matrix peak area and an initial microfracture peak area of ​​the core sample.

[0087] S320, determining a test temperature and a test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determining an initial liquid level height of the fracturing fluid in a metering tube connected to the core sample at an initial time.

[0088] The initial liquid level height may be understood as the height of the fracturing fluid in the metering tube at the initial time; the initial liquid level height may also be understood as the height of the fracturing fluid in the metering tube before being absorbed by the core sample.

[0089] In the embodiment of the present invention, the initial time may be the time when the fracturing fluid has been put into the metering tube, but the core sample has not yet started to absorb the fracturing fluid. The initial time may be, for example, the time when the fracturing fluid has been put into the metering tube and the fracturing fluid is in contact with the core sample, but the core sample has not yet started to absorb the fracturing fluid; the initial time may be, for example, any time when the fracturing fluid has been put into the metering tube and there is a gap between the fracturing fluid and the core sample and they cannot be directly connected.

[0090] Exemplarily, the core sample can be tested by a permeability testing device, which may include at least a core clamp for clamping the core sample, a metering tube connected to the core clamp and allowing the fracturing fluid in the metering tube to contact the core sample, a confining pressure pump and a heating box; the core sample can be loaded into the core clamp, and the core sample and the core clamp can be heated to the test temperature by the heating box, and the core sample and the core clamp can be loaded to the test confining pressure by the confining pressure pump; when the core sample is at the test temperature and the test confining pressure, the initial liquid level of the fracturing fluid in the metering tube connected to the core sample at the initial time can be determined.

[0091] S330: Based on the initial liquid level, determine the total amount of imbibition of the core sample at the target time.

[0092] In combination with the above example, illustratively, after determining the initial liquid level height of the fracturing fluid in the metering tube connected to the core sample at the initial time, the core sample can be allowed to begin to absorb the fracturing fluid, and the liquid level height of the fracturing fluid at the target time can be determined, and the difference between the initial liquid level height and the liquid level height of the fracturing fluid at the target time is taken as the total absorption amount.

[0093] S340. When the core sample is at a test temperature and a test confining pressure, determine a target core matrix peak area and a target microcrack peak area of ​​the core sample at a target time.

[0094] S350, determining the matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

[0095] The technical solution of the embodiment of the present invention determines the initial liquid level height of the fracturing fluid in the metering tube connected to the core sample at the initial time when the core sample is at the test temperature and the test confining pressure; based on the initial liquid level height, determines the total imbibition amount of the core sample at the target time. The above technical solution determines the total imbibition amount of the core sample at the target time by the initial liquid level height of the fracturing fluid in the metering tube connected to the core sample at the initial time, so that the total imbibition amount can be determined relatively simply according to the metering change of the fracturing fluid, thereby reducing the difficulty of shale imbibition capacity testing.

[0096] An optional technical solution determines the total amount of imbibition of the core sample at a target time based on an initial liquid level, including: determining a target liquid level of the fracturing fluid in a metering tube at a target time; and determining the total amount of imbibition of the core sample at a target time based on the initial liquid level and the target liquid level.

[0097] The target liquid level height can be understood as the height of the fracturing fluid in the metering tube at the target time; the target liquid level height can also be understood as the height of the fracturing fluid in the metering tube before being absorbed by the core sample at the target time.

[0098] In an embodiment of the present invention, the target liquid level height of the fracturing fluid in the metering tube at the target time can be determined; based on the difference between the initial liquid level height and the target liquid level height, the total imbibition amount of the core sample at the target time is determined, for example, the difference between the initial liquid level height and the target liquid level height can be used as the total imbibition amount.

[0099] In an embodiment of the present invention, by determining the total imbibition amount of the core sample at the target time based on the initial liquid level height and the target liquid level height, the total imbibition amount can be determined more simply based on the metering changes of the fracturing fluid, thereby further reducing the difficulty of shale imbibition capacity testing.

[0100] In order to better understand the technical solution of the above embodiment of the present invention, an optional example is provided here. Figure 8The core sample can be tested by the absorption capacity testing device. The absorption capacity testing device may include a metering tube 1, a sealing liquid 2, a fracturing fluid 3, a suction pipe 4, a core holder 6 for holding a core sample 5, a nuclear magnetic resonance device 7, an insulation jacket 8, a heating box 9, a confining pressure pump 10, a cylindrical spacer 11, and a core holder outlet valve 12. Among them, the core sample 5 can be placed in the core clamp 6; one end face of the core sample 5 can be in contact with the fluid such as the fracturing fluid 3, and the other end face can be in contact with the cylindrical pad 11; the confining pressure pump 10 can be used to load the confining pressure to the core sample 5; the heating box 9 can be used to heat the core sample 5; the insulation sleeve 8 can be used to maintain a constant temperature; the nuclear magnetic resonance equipment can be used to monitor the imbibition capacity of the matrix and microcracks of the core sample online; the contact surface between the cylindrical pad 11 and the core sample 5 is provided with a guide groove; the center of the circular pad 11 is provided with a hole 11-1 for the flow of fluid such as the fracturing fluid 3, and the fluid can flow to the core clamp outlet valve 12 through the hole 11-1; the maximum loading temperature of the imbibition capacity testing device can be 150°C; the maximum stress of the imbibition capacity testing device can be 50MPa; the stress control accuracy of the imbibition capacity testing device can be 0.01MPa, and the stress holding time of the imbibition capacity testing device can be greater than 24h.

[0101] Specifically, the core sample can be loaded into the core holder 6, and the confining pressure pump 10 can be used to load the core sample with a preset initial confining pressure, which can be, for example, 5 MPa; the core sample and the core holder 6 are heated to the test temperature by the heating box 9; and the core sample and the core holder 6 are loaded to the test confining pressure by the confining pressure pump 10; the fracturing fluid 3 is sucked into the metering tube 1 through the suction pipe 4, and when the liquid level of the fracturing fluid 3 reaches a preset position, such as around the 0 scale line, the suction pipe 4 is closed, and a fluid such as oil is used as the sealing liquid 2; the suction pipe 4 can be closed, and the oil and other fluids can be used as the sealing liquid 2; the time after the suction pipe 4 is closed and the oil and other fluids are used is taken as the initial time, and the initial liquid level height of the fracturing fluid in the metering tube at the initial time is determined, for example, the height of the 0 scale line reached by the liquid level of the fracturing fluid 3 can be taken as the initial liquid level height; the target liquid level height of the fracturing fluid in the metering tube at the target time is determined, and the target time can be a preset time after the initial time. The time interval of the preset time period, for example, the preset interval can be 0.5 hours, then the target time is the time every 0.5 hours after the initial time; the liquid level of the fracturing fluid in the metering tube is recorded as the target liquid level every 0.5 hours, and the difference between the target liquid level corresponding to each target time and the target liquid level or initial liquid level corresponding to the adjacent target time or initial time is the total imbibition amount of the core sample corresponding to the target time; when the core sample is at the test temperature and the test confining pressure, the core sample can be monitored online in real time by nuclear magnetic resonance technology, and the target T2 spectrum curve corresponding to each target time is tested. Based on the target T2 spectrum curve, the target core matrix peak area and the target microcrack peak area of ​​the core sample at the target time are determined; according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area, the matrix dynamic imbibition amount and the microcrack dynamic imbibition amount of the core sample are determined.

[0102] In order to better understand the technical solution of the above-mentioned embodiment of the present invention, an optional example is provided here. Exemplarily, for the core sample collected from the target shale reservoir section, the initial core matrix peak area and the initial microcrack peak area of ​​the core sample at the initial time are determined; the test temperature and the test confining pressure are determined, and when the core sample is at the test temperature and the test confining pressure and the target time is 5 hours and 10 hours after the preset time, respectively, the matrix imbibition peak area ratio is determined according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area and the target microcrack peak area, and the microcrack imbibition peak area ratio is determined according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area and the target microcrack peak area, and the data determined by the above test are shown in Table 1 below.

[0103] Table 1 Data obtained from tests with different target times

[0104]

[0105] When the target time is 5 hours after the preset time, the matrix dynamic imbibition of the core sample is determined to be 1.47 cm based on the ratio of the total imbibition amount to the matrix imbibition peak area. 3 According to the ratio of the total amount of imbibition and the peak area of ​​microfracture imbibition, the dynamic imbibition of the microfractures of the core sample was determined to be 0.03 cm 3 When the target time is 10 hours after the preset time, the matrix dynamic imbibition of the core sample is determined to be 3.45 cm based on the ratio of the total imbibition amount and the matrix imbibition peak area. 3 ; According to the ratio of the total amount of imbibition and the peak area of ​​microfracture imbibition, the dynamic imbibition amount of microfractures of the core sample was determined to be 0.15cm3.

[0106] It can be seen from the above shale imbibition capacity test results that the contribution of matrix voids in core samples to the imbibition capacity is much higher than that of microcracks, and the imbibition capacity of core samples, that is, the dynamic imbibition amount, changes with time.

[0107] Fig. 9 This is a structural block diagram of a shale permeability testing device provided in an embodiment of the present invention, and the device is used to execute the shale permeability testing method provided in any of the above embodiments. The device and the shale permeability testing method in the above embodiments belong to the same inventive concept. For details not described in detail in the embodiment of the shale permeability testing device, please refer to the embodiment of the shale permeability testing method. Fig. 9 The device may specifically include: an initial microcrack peak area determination module 410, a target microcrack peak area determination module 420 and a microcrack dynamic permeability determination module 430.

[0108] The initial micro-fracture peak area determination module 410 is used to determine the initial core matrix peak area and the initial micro-fracture peak area of ​​the core sample collected from the target shale reservoir segment;

[0109] The target microcrack peak area determination module 420 is used to determine the test temperature and the test confining pressure, and determine the total imbibition amount of the core sample at the target time, the target core matrix peak area, and the target microcrack peak area when the core sample is at the test temperature and the test confining pressure;

[0110] The microfracture dynamic imbibition amount determination module 430 is used to determine the matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

[0111] Optionally, the target microcrack peak area determination module 420 may include:

[0112] A collection well parameter acquisition unit, used to acquire the collection well parameters of a target collection well, wherein the target collection well is a collection well from which a core sample is collected;

[0113] The test confining pressure determination unit is used to determine the test temperature and the test confining pressure according to the acquisition well parameters.

[0114] Optionally, based on the above device, the acquisition well parameters include the core formation temperature of the target acquisition well, and at least one of the formation pore pressure, maximum horizontal principal stress, minimum horizontal principal stress, vertical stress and effective stress coefficient of the target acquisition well;

[0115] The test confining pressure determination unit may include:

[0116] The test temperature is used as a subunit to take the core formation temperature as the test temperature;

[0117] The test confining pressure determination subunit is used to determine the test confining pressure according to at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient.

[0118] Optionally, based on the above device, a subunit for determining the confining pressure is tested, which can be specifically used for:

[0119] determining a vertical effective stress based on at least one of a vertical stress, an effective stress coefficient, and a formation pore pressure;

[0120] determining a maximum horizontal effective principal stress based on at least one of a maximum horizontal principal stress, an effective stress coefficient, and a formation pore pressure;

[0121] determining a minimum horizontal effective principal stress based on at least one of a minimum horizontal principal stress, an effective stress coefficient, and a formation pore pressure;

[0122] The test confining pressure is determined based on the vertical effective stress, the minimum horizontal effective principal stress and the maximum horizontal effective principal stress.

[0123] Optionally, the target microcrack peak area determination module 420 may include:

[0124] An initial liquid level determination unit is used to determine the initial liquid level of the fracturing fluid in the metering tube connected to the core sample at an initial time when the core sample is at a test temperature and a test confining pressure;

[0125] The total imbibition amount determination unit is used to determine the total imbibition amount of the core sample at a target time based on the initial liquid level.

[0126] Optionally, based on the above device, the total amount of imbibition determination unit may include:

[0127] A target liquid level determination subunit is used to determine a target liquid level of the fracturing fluid in the metering tube at a target time;

[0128] The total imbibition amount determination subunit is used to determine the total imbibition amount of the core sample at a target time according to the initial liquid level height and the target liquid level height.

[0129] Optionally, the target microcrack peak area determination module 420 may include:

[0130] A target T2 spectrum curve determination unit is used to determine a target T2 spectrum curve of the core sample at a target time when the core sample is at a test temperature and a test confining pressure;

[0131] The target microcrack peak area determination unit is used to determine the target core matrix peak area and the target microcrack peak area of ​​the core sample at the target time based on the target T2 spectrum curve.

[0132] Optionally, the initial microcrack peak area determination module 410 may include:

[0133] A peak area determination unit, used to determine an initial T2 spectrum curve of the core sample, and to determine a peak area corresponding to at least one peak in the initial T2 spectrum curve;

[0134] The initial microcrack peak area determination unit is used to determine the initial core matrix peak area and the initial microcrack peak area of ​​the core sample according to the peak areas respectively corresponding to at least one peak.

[0135] Optionally, the micro-crack dynamic imbibition amount determination module 430 may include:

[0136] A matrix imbibition peak area ratio determination unit is used to determine the matrix imbibition peak area ratio according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area and the target microcrack peak area;

[0137] A fracture imbibition peak area ratio determination unit is used to determine the microfracture imbibition peak area ratio according to the initial core matrix peak area, the initial microfracture peak area, the target core matrix peak area and the target microfracture peak area;

[0138] A matrix dynamic imbibition amount determination unit is used to determine the matrix dynamic imbibition amount of the core sample according to the total imbibition amount and the ratio of the matrix imbibition peak area;

[0139] The micro-fracture dynamic imbibition amount determination unit is used to determine the micro-fracture dynamic imbibition amount of the core sample according to the total imbibition amount and the ratio of the micro-fracture imbibition peak area.

[0140] The shale imbibition capacity testing device provided by the embodiment of the present invention is used to determine the initial core matrix peak area and the initial microcrack peak area of ​​the core sample collected from the target shale reservoir section through the initial microcrack peak area determination module; determine the test temperature and the test confining pressure through the target microcrack peak area determination module, and determine the total imbibition amount of the core sample at the target time, the target core matrix peak area and the target microcrack peak area when the core sample is at the test temperature and the test confining pressure; and determine the matrix dynamic imbibition amount and the microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area through the microcrack dynamic imbibition amount determination module. The above device uses the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area as the determining factors of the matrix dynamic imbibition amount and the microcrack dynamic imbibition amount of the core sample, thereby realizing the test of the matrix and microcrack imbibition capacity of shale.

[0141] The shale permeability testing device provided in the embodiment of the present invention can execute the shale permeability testing method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0142] It is worth noting that in the embodiment of the above-mentioned shale permeability testing device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0143] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0144] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing shale permeability, characterized in that: include: For a core sample collected from a target shale reservoir section, determining an initial core matrix peak area and an initial microfracture peak area of ​​the core sample; Determine a test temperature and a test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determine the total imbibition amount of the core sample at a target time, a target core matrix peak area, and a target microcrack peak area; The matrix dynamic imbibition amount and microfracture dynamic imbibition amount of the core sample are determined according to the initial core matrix peak area, the initial microfracture peak area, the total imbibition amount, the target core matrix peak area and the target microfracture peak area.

2. The method according to claim 1, characterized in that: Determining the test temperature and the test confining pressure includes: Acquiring the collection well parameters of the target collection well, wherein the target collection well is the collection well from which the core sample is collected; The test temperature and the test confining pressure are determined according to the acquisition well parameters.

3. The method according to claim 2, characterized in that The acquisition well parameters include the core formation temperature of the target acquisition well, and at least one of the formation pore pressure, maximum horizontal principal stress, minimum horizontal principal stress, vertical stress and effective stress coefficient of the target acquisition well; Determining the test temperature and the test confining pressure according to the acquisition well parameters includes: Using the core formation temperature as the test temperature; The test confining pressure is determined according to at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient.

4. The method according to claim 3, characterized in that The determining of the test confining pressure according to at least one of the formation pore pressure, the maximum horizontal principal stress, the minimum horizontal principal stress, the vertical stress and the effective stress coefficient comprises: determining a vertical effective stress based on at least one of the vertical stress, the effective stress coefficient, and the formation pore pressure; determining a maximum horizontal effective principal stress according to at least one of the maximum horizontal principal stress, the effective stress coefficient and the formation pore pressure; determining a minimum horizontal effective principal stress based on at least one of the minimum horizontal principal stress, the effective stress coefficient, and the formation pore pressure; The test confining pressure is determined according to the vertical effective stress, the minimum horizontal effective principal stress and the maximum horizontal effective principal stress.

5. The method according to claim 1, characterized in that The step of determining the total amount of imbibition of the core sample at a target time when the core sample is at the test temperature and the test confining pressure comprises: Under the condition that the core sample is at the test temperature and the test confining pressure, determining the initial liquid level height of the fracturing fluid in the metering tube connected to the core sample at the initial time; Based on the initial liquid level height, the total amount of imbibition of the core sample at the target time is determined.

6. The method according to claim 5, characterized in that The step of determining the total amount of imbibition of the core sample at a target time based on the initial liquid level comprises: determining a target fluid level height of the fracturing fluid in the metering tube at a target time; The total amount of imbibition of the core sample at the target time is determined according to the initial liquid level height and the target liquid level height.

7. The method according to claim 1, characterized in that The step of determining a target core matrix peak area and a target microcrack peak area of ​​the core sample at a target time when the core sample is at the test temperature and the test confining pressure includes: Determining a target T2 spectrogram curve of the core sample at the target time when the core sample is at the test temperature and the test confining pressure; Based on the target T2 spectrum curve, a target core matrix peak area and a target microcrack peak area of ​​the core sample at the target time are determined.

8. The method according to claim 1, characterized in that Determining the initial core matrix peak area and the initial microcrack peak area of ​​the core sample comprises: Determine an initial T2 spectrum curve of the core sample, and determine the peak area corresponding to at least one peak in the initial T2 spectrum curve; The initial core matrix peak area and the initial microcrack peak area of ​​the core sample are determined according to the peak areas respectively corresponding to the at least one peak.

9. The method according to claim 1, characterized in that: Determining the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area, and the target microcrack peak area includes: Determining a matrix imbibition peak area ratio according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area, and the target microcrack peak area; Determining a microcrack imbibition peak area ratio according to the initial core matrix peak area, the initial microcrack peak area, the target core matrix peak area, and the target microcrack peak area; Determining the matrix dynamic imbibition amount of the core sample according to the total imbibition amount and the ratio of the matrix imbibition peak area; The dynamic imbibition amount of the microfractures of the core sample is determined according to the total imbibition amount and the ratio of the microfracture imbibition peak area.

10. A shale permeability testing device, characterized in that: include: An initial micro-fracture peak area determination module is used to determine the initial core matrix peak area and the initial micro-fracture peak area of ​​the core sample collected from the target shale reservoir section; A target microcrack peak area determination module is used to determine a test temperature and a test confining pressure, and when the core sample is at the test temperature and the test confining pressure, determine the total imbibition amount of the core sample at a target time, a target core matrix peak area, and a target microcrack peak area; The microcrack dynamic imbibition amount determination module is used to determine the matrix dynamic imbibition amount and microcrack dynamic imbibition amount of the core sample according to the initial core matrix peak area, the initial microcrack peak area, the total imbibition amount, the target core matrix peak area and the target microcrack peak area.

Images