Shale porosity testing method, processing equipment and dual-chamber porosity gas testing system

Abstract

The present application provides a shale porosity testing method, processing equipment and dual-chamber porosity gas measurement system, which relate to the technical field of shale exploration and development. The method includes: obtaining pressure information corresponding to each detection time and generating a relationship curve; determining the target time point as the boundary time point of the gas medium filling the sample chamber through the reference chamber and the gas medium filling the sample chamber and then infiltrating into the shale sample to be tested placed in the sample chamber according to the relationship curve; determining the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time. The present application determines the porosity by measuring the pressure value at the inflection point and equilibrium state of the curve on the relationship curve, avoiding the use of physical measurement tools such as vernier calipers to measure the total volume of the shale sample to be tested, which not only reduces the system error caused by physical measurement, but also is suitable for porosity testing of irregular-shaped samples.

Description

Technical Field

[0001] The present application relates to the technical field of shale exploration and development, and in particular to a shale porosity testing method, processing equipment and a dual-chamber porosity gas measurement system. Background Art

[0002] Porosity is an important technical parameter for shale gas reservoir evaluation, and the total volume and skeleton volume of shale samples are also important parameters that are indispensable for calculating shale porosity. Calculating shale porosity can help users understand and analyze the physical properties of shale gas reservoirs, which is of great significance for energy development and environmental protection.

[0003] Existing shale porosity testing methods mainly include gas testing, liquid testing and nuclear magnetic resonance. In the process of calculating shale porosity based on the above testing methods, it is necessary to first prepare a shale sample with a regular shape, and use a measuring tool such as a vernier caliper to measure the total volume of the shale sample, and then combine the skeleton volume of the shale sample determined by other testing methods to determine the shale porosity. Since the existing method can only measure the total volume of shale samples with a regular shape, and the total volume and skeleton volume of the shale sample are obtained by different testing methods, the systematic error between the total volume and skeleton volume of the shale sample cannot be eliminated, which leads to a large error in the final porosity.

[0004] Therefore, the existing shale porosity testing method is not suitable for the porosity determination of irregular shale samples, and the porosity testing accuracy is low. Summary of the invention

[0005] The purpose of this application is to provide a shale porosity gas measurement method, processing equipment and dual-chamber porosity gas measurement system to address the deficiencies in the above-mentioned prior art, so as to solve the problem that the existing shale porosity testing method is not suitable for porosity determination of irregular shale samples and the porosity testing accuracy is low.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides a shale porosity testing method, which is applied to a processing device in a dual-chamber porosity gas testing system, wherein the dual-chamber porosity gas testing system includes the processing device and a dual-chamber porosity gas testing device, wherein the dual-chamber porosity gas testing device includes at least a reference chamber, a sample chamber, and a pressure detection device, wherein the reference chamber is connected to the sample chamber via a pipeline, and the pressure detection device is disposed on the pipeline; the method includes:

[0008] Obtaining pressure information corresponding to each detection time detected by the pressure detection device, and generating a relationship curve according to each detection time and the pressure information corresponding to each detection time, wherein the relationship curve is used to indicate a change trend of the pressure information detected by the pressure detection device over time;

[0009] According to the relationship curve, a target time point is determined, wherein the target time point is a boundary time point when the gas medium fills the sample chamber through the reference chamber and when the gas medium fills the sample chamber and then infiltrates into the shale sample to be tested placed in the sample chamber;

[0010] The porosity of the shale sample to be tested is determined according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time. The first detection time is the detection time corresponding to the pressure in the reference chamber being in a stable state after the gas medium is input into the reference chamber. The second detection time is the detection time corresponding to the gas medium expanding from the reference chamber to the sample chamber and the reference chamber and the sample chamber being in a pressure equilibrium state.

[0011] As a possible implementation manner, determining the target time point according to the relationship curve includes:

[0012] According to the relationship curve, determining curve slope change information;

[0013] The target time point is determined according to the curve slope change information.

[0014] As a possible implementation manner, determining the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time includes:

[0015] determining the total volume of the shale sample to be tested according to the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time;

[0016] determining the skeleton volume of the shale sample to be tested according to the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time;

[0017] The porosity of the shale sample to be tested is determined according to the total volume and the skeleton volume.

[0018] As a possible implementation manner, before determining the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time, the method further includes:

[0019] Acquiring third pressure information of each standard sample placed in the sample chamber detected by the pressure detection device, the third pressure information including pressure information when the gas medium is input into the reference chamber and the pressure in the reference chamber is in a stable state, and pressure information when the gas medium expands from the reference chamber to the sample chamber and the reference chamber and the sample chamber are in a pressure equilibrium state;

[0020] According to the third pressure information and the volume information of each of the standard samples, the preset correlation relationship is fitted to obtain a target correlation relationship, wherein the preset correlation relationship is used to indicate the correlation relationship between the initial pressure of the reference chamber, the volume of the reference chamber, the volume of the sample chamber and the volume information of the standard sample, and the target correlation relationship is used to indicate the linear relationship between the volume information and the pressure information of the shale sample to be tested.

[0021] As a possible implementation manner, determining the total volume of the shale sample to be tested according to the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time includes:

[0022] Determining the total volume of the shale sample to be tested based on the target association relationship, the pressure information corresponding to the target time point, and the first pressure information corresponding to the first detection time;

[0023] The determining the skeleton volume of the shale sample to be tested according to the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time includes:

[0024] The skeleton volume of the shale sample to be tested is determined based on the target association relationship, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time.

[0025] As a possible implementation manner, determining the porosity of the shale sample to be tested according to the total volume and the skeleton volume includes:

[0026] Determining a first volume difference corresponding to the shale sample to be tested according to the total volume and the skeleton volume;

[0027] The ratio of the total volume of the shale sample to be tested to the first volume difference is used as the porosity of the shale sample to be tested.

[0028] As a possible implementation, a target standard sample of preset volume is further placed in the sample chamber, and the target standard sample is used to reduce the idle volume in the sample chamber; and determining the porosity of the shale sample to be tested according to the total volume and the skeleton volume further includes:

[0029] Acquiring volume information of the target standard sample;

[0030] The porosity of the shale sample to be tested is determined according to the total volume, the skeleton volume and the volume information of the target standard sample.

[0031] As a possible implementation manner, determining the porosity of the shale sample to be tested according to the total volume, the skeleton volume and the volume information of the target standard sample includes:

[0032] Determining the target total volume of the shale sample to be tested according to the total volume and the volume information of the target standard sample;

[0033] Determining a target skeleton volume of the shale sample to be tested according to the skeleton volume and the volume information of the target standard sample;

[0034] Determining a second volume difference corresponding to the shale sample to be tested according to the target total volume and the target skeleton volume;

[0035] The ratio of the target total volume to the second volume difference is used as the porosity of the shale sample to be tested.

[0036] In a second aspect, an embodiment of the present application provides a processing device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor. When the processing device is running, the processor and the storage medium communicate through the bus, and the processor executes the machine-readable instructions to perform the steps of the shale porosity testing method as described in any one of the first aspects above.

[0037] In a third aspect, an embodiment of the present application provides a dual-chamber porosity gas measurement system, the dual-chamber porosity gas measurement system comprising the processing device and the dual-chamber porosity gas measurement device according to the second aspect, the dual-chamber porosity gas measurement device comprising at least: a reference chamber, a sample chamber and a pressure detection device;

[0038] The reference chamber is connected to the sample chamber via a pipeline, the pressure detection device is arranged on the pipeline, a first valve is arranged on the pipeline between the reference chamber and the gas medium source, a second valve is arranged on the pipeline connecting the reference chamber and the sample chamber, and the processing equipment is communicatively connected to the pressure detection device;

[0039] The processing equipment is used to perform porosity testing on the shale sample to be tested based on the method described in any one of the first aspects above.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the shale porosity testing method as described in any one of the above-mentioned first aspects are executed.

[0041] According to the shale porosity testing method, processing equipment and dual-chamber porosity gas testing system of the embodiment of the present application, the dual-chamber porosity gas testing system includes a processing equipment and a dual-chamber porosity gas testing device, the dual-chamber porosity gas testing device includes at least a reference chamber, a sample chamber and a pressure detection device, the reference chamber is connected to the sample chamber through a pipeline, and the pressure detection device is arranged on the pipeline. In the process of performing porosity testing using the dual-chamber porosity gas testing device, the processing equipment obtains the pressure information corresponding to each detection time detected by the pressure detection device, and generates a relationship curve according to each detection time and the pressure information corresponding to each detection time, the relationship curve is used to indicate the change trend of the pressure information detected by the pressure detection device over time, and then according to the relationship curve, the target time point is determined, and according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time, the porosity of the shale sample to be tested is determined. According to the embodiment of the present application, the necessary parameters for calculating the porosity can be obtained by performing a test using a dual-chamber porosity gas testing device, and a method for determining the total volume and skeleton volume of a shale sample to be tested without the aid of a physical measuring tool such as a vernier caliper is provided. Based on the pressure information detected by the pressure detection device, a pressure-time relationship curve indicating the changing trend of the pressure information over time is drawn. By analyzing the relationship curve, the boundary time points of the gas medium filling the sample chamber through the reference chamber and the gas medium infiltrating into the shale sample to be tested placed in the sample chamber after filling the sample chamber are determined to obtain a target time point, and a first detection time corresponding to the pressure in the reference chamber being in a stable state after the gas medium is input into the reference chamber, and a second detection time corresponding to the gas medium expanding from the reference chamber to the sample chamber and the reference chamber and the sample chamber being in a pressure equilibrium state are selected. Then, the pressure information corresponding to the target time point, the first detection time, and the second detection time are used to respectively determine the total volume and skeleton volume of the shale sample to be tested, and then the porosity of the shale sample to be tested is determined. On this basis, the shale porosity testing method provided in the embodiment of the present application does not require the shape of the shale sample to be tested. Regardless of whether the shape of the shale sample to be tested is regular, the porosity of the shale sample to be tested can be accurately calculated, and the total volume and skeleton volume of the shale sample to be tested are determined by the pressure information corresponding to the appropriate time point. The two can be compared, thereby reducing the system error while further improving the test accuracy of the porosity of low-porosity and low-permeability rocks such as shale. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic structural diagram of a dual-chamber porosity gas measurement system provided in an embodiment of the present application is shown;

[0044] Figure 2 A schematic structural diagram of a dual-chamber porosity gas measurement device provided in an embodiment of the present application is shown;

[0045] Figure 3 A schematic diagram of a shale porosity testing method provided in an embodiment of the present application is shown;

[0046] Figure 4 A complete schematic diagram of a relationship curve provided in an embodiment of the present application is shown;

[0047] Figure 5 A partial schematic diagram of a relationship curve provided in an embodiment of the present application is shown;

[0048] Figure 6 A schematic diagram of a process for determining a target association relationship provided by an embodiment of the present application is shown;

[0049] Figure 7 A schematic diagram showing a linear relationship between volume information and pressure information provided by an embodiment of the present application is shown;

[0050] Figure 8 A schematic diagram of a process for determining porosity provided in an embodiment of the present application is shown;

[0051] Fig. 9 A schematic diagram of the structure of a processing device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0052] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0053] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0054] In order to enable those skilled in the art to use the content of this application, the following implementation is provided in conjunction with a specific application scenario, "A method for calculating shale porosity test based on a gas balance method pressure reduction curve". For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application. Although this application is mainly described around a shale porosity test method, it should be understood that this is only an exemplary embodiment.

[0055] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0056] Existing shale porosity testing methods mainly include gas testing, liquid testing and nuclear magnetic resonance. Among them, the gas testing method has become a widely used porosity testing method in the exploration field because the testing process does not need to destroy the internal structure of the sample and the test results are highly accurate under ideal testing conditions. Specifically, the gas testing method is mainly based on Boyle's law. After the gas expands into the pores of the sample, the pressure before and after equilibrium is recorded to determine the shale skeleton volume, and then the sample porosity is calculated according to the formula Φ = (Vtotal-Vskeleton) / Vtotal×100%, where Φ represents the sample porosity, Vtotal represents the total volume of shale, and Vskeleton represents the shale skeleton volume. However, in actual operation, the gas testing method has the following problems:

[0057] (1) The determination of the total volume of shale requires the preparation of a standard sample, such as a 1-inch cylindrical sample, and then the use of a vernier caliper to measure and calculate the total volume of the shale. However, due to the well-developed stratification, brittleness and fragility of shale, it is difficult to prepare cylindrical rock samples. (2) Only the total volume of shale samples with regular shapes can be determined, and the total volume of shale samples with irregular shapes cannot be determined, and thus the porosity of shale samples with irregular shapes cannot be determined. Even if there are new methods to determine the total volume of irregular shale samples, such as 3D scanning method, package density meter method, etc., after long-term comparison, the systematic error of the total volume of irregular shale samples determined by various methods is large, averaging about 2%. (3) The total volume and skeleton volume of shale samples are measured by different methods, and the results are difficult to compare. For example, for samples with a porosity of less than 1%, if the error of the total volume reaches 2%, the unreasonable result of the total volume of the sample less than the skeleton volume may be obtained, that is, the porosity is negative.

[0058] Therefore, how to eliminate the systematic error between the total sample volume and the skeleton volume measurement to the greatest extent possible, establish a porosity testing method for irregular shale that is not limited to cylindrical shapes, and make the porosity results reasonable and credible, has become a technical problem that technical personnel in this field urgently need to solve.

[0059] In response to the problems existing in the above-mentioned prior art, an embodiment of the present application provides a testing method for calculating shale porosity based on the gas balance method pressure reduction curve, so as to solve the problems in the prior art that shale samples with regular shapes are difficult to prepare, the measurement error of the total volume of shale samples is large, and the total volume and skeleton volume are not comparable, further improve the testing accuracy of the porosity of low-porosity and low-permeability rocks such as shale, and realize the determination of the porosity of irregular shale samples.

[0060] Figure 1 FIG. 1 is a schematic diagram showing the structure of a dual-chamber porosity gas measurement system provided in an embodiment of the present application. Figure 1 As shown, the dual-chamber porosity gas measurement system includes a processing device and a dual-chamber porosity gas measurement device. The dual-chamber porosity gas measurement device at least includes: a reference chamber, a sample chamber and a pressure detection device. The reference chamber is connected to the sample chamber through a pipeline, and a first valve is provided on the pipeline between the reference chamber and the gas medium source, and a second valve is provided on the pipeline connecting the reference chamber and the sample chamber. The pressure detection device is provided on the pipeline, and the pressure detection device is communicatively connected with the processing device. The processing device obtains and processes the pressure information collected by the pressure detection device, and then determines the porosity of the shale sample to be tested placed in the sample chamber according to the pressure information.

[0061] Optionally, the reference chamber is used to store a certain amount of gas medium, the sample chamber is used to place the shale sample to be tested, and the pressure detection device is used to detect the pressure change in the pipeline. The reference chamber and the sample chamber are connected by a pipeline, and a first valve is installed on the pipeline between the reference chamber and the gas medium source to control the gas medium to enter the reference chamber, and a second valve is installed on the pipeline between the reference chamber and the sample chamber to control the gas medium to enter the sample chamber from the reference chamber.

[0062] Specifically, the first valve is opened to allow the gas medium to enter the reference chamber, the first valve is closed, and the second valve is opened to allow the gas medium in the reference chamber to quickly fill the sample chamber. When the sample chamber is filled with the gas medium, the gas medium will continue to penetrate into the pores of the shale sample to be tested placed in the sample chamber. In this process, the pressure detection device detects the pressure changes in the pipeline in real time, and transmits the collected pressure information to the processing equipment, which calculates the porosity of the shale sample to be tested based on the collected pressure information.

[0063] Figure 2 FIG. 1 is a schematic diagram showing the structure of a dual-chamber porosity gas measurement device provided in an embodiment of the present application. Figure 2 As shown, the pressure detection device can be a pressure gauge, and the gas medium source can be a gas medium container, such as a helium cylinder. A third valve is also provided on the pipeline, and the third valve is always in a closed state to prevent the gas medium entering the sample chamber from leaking out, thereby ensuring the accuracy of pressure balance during the test and avoiding interference of external gas on the test results.

[0064] Optionally, the shale sample to be tested in the embodiment of the present application takes the black shale of the Qingshankou Formation in the Songliao Basin as an example, and the dual-chamber porosity gas testing device is placed in a constant temperature box, the test environment temperature is kept stable at 26.0°C, and the test environment temperature change is maintained at ±0.2°C, and the test environment pressure is basically stable at sea level pressure.

[0065] Optionally, refer to Figure 2 As shown, the process of testing the porosity of the shale sample to be tested by the dual-chamber porosity gas testing device mainly includes two stages: stage one: open the first valve, input the gas medium stored in the helium bottle into the reference chamber according to the predetermined pressure, close the first valve, and read the pressure value displayed on the pressure gauge after the pressure stabilizes; stage two: open the second valve, so that the gas medium in the reference chamber expands to the sample chamber where the shale sample to be tested is placed, and read the pressure value displayed on the pressure gauge after the pressure stabilizes. It should be noted that in stage two, the gas medium will first quickly fill the sample chamber from the reference chamber, and then penetrate into the pores of the shale sample to be tested until the pressure reaches equilibrium.

[0066] It should be noted that for shale samples with a porosity generally lower than 3% and a low permeability, on the relationship curve (pressure / time curve) generated based on the detection time and the pressure information corresponding to the detection time, an inflection point can be clearly observed for distinguishing the two processes of the gas medium filling the sample chamber through the reference chamber and the gas medium filling the sample chamber and then infiltrating into the pores of the shale sample to be tested placed in the sample chamber. For samples with a larger porosity and a higher permeability, when the second valve is opened, the gas medium will not only quickly fill the space of the sample chamber, but also quickly infiltrate the pores of the sample to be tested. There is no obvious inflection point on the pressure / time curve to distinguish the process of the gas medium filling the sample chamber and the gas medium infiltrating into the pores of the sample to be tested, so the method provided in the embodiment of the present application is suitable for testing the porosity of shale samples with low porosity and permeability.

[0067] Based on this, according to the dual-chamber porosity gas measurement system and dual-chamber porosity gas measurement device provided in the embodiments of the present application, the degree of penetration of the gas medium into the pores of the shale sample to be tested is determined by measuring the pressure changes at different stages, and the pressure change information of the process from rapid filling to slow penetration of the gas medium in the sample chamber is used to accurately determine the porosity of the shale sample to be tested.

[0068] The following is combined with the above Figure 1 The dual-chamber porosity gas measurement system shown and Figure 2 The contents described in the dual-chamber porosity gas testing device shown are used to explain in detail the shale porosity testing method provided in the embodiment of the present application.

[0069] Reference Figure 3 FIG. 1 is a flow chart of a shale porosity testing method provided in an embodiment of the present application. The execution subject of the method is a processing device in a dual-chamber porosity gas testing system. Figure 3 As shown, the method specifically comprises the following steps:

[0070] S301, obtaining pressure information corresponding to each detection time detected by a pressure detection device, and generating a relationship curve according to each detection time and the pressure information corresponding to each detection time.

[0071] Optionally, the relationship curve is used to indicate the changing trend of the pressure information detected by the pressure detection device over time. The pressure detection device can be a pressure gauge, and a series of time points and the pressure values ​​corresponding to each time point are read from the pressure gauge. For example, at a time interval of 1 second, the pressure value displayed on the pressure gauge is read second by second to obtain multiple detection times and the pressure values ​​corresponding to each detection time, and the detection time is used as the horizontal axis and the pressure value is used as the vertical axis. Based on each detection time and its corresponding pressure value, multiple marking points are formed, and each marking point is connected to draw a relationship curve, that is, a "pressure-time" relationship curve is obtained.

[0072] Optionally, refer to Figure 4 In the relationship curve shown, the horizontal axis represents the test time, the test time is in hours, and the pressure value is in pounds per square inch (psi). Figure 4 P1, P2 and P3 shown in the figure are all pressure values ​​corresponding to different test times. Based on this relationship curve, it can be determined how the pressure changes with time during the test process, for example, whether the pressure value increases, decreases or remains stable with time, and how fast the pressure changes.

[0073] S302: Determine the target time point according to the relationship curve.

[0074] Optionally, the target time point is the boundary time point when the gas medium fills the sample chamber through the reference chamber and the gas medium infiltrates into the shale sample to be tested placed in the sample chamber after filling the sample chamber. Since the shale sample to be tested has the characteristics of low porosity and permeability, the gas medium expands from the reference chamber to the sample chamber and quickly fills the sample chamber, and then slowly infiltrates into the pores of the shale sample to be tested. In this process, the process of the gas medium filling the sample chamber is relatively fast, while the process of the gas medium infiltrating into the pores of the shale sample to be tested is relatively slow. Accordingly, the change of the pressure detection device is reflected in the different amplitudes of the pressure value displayed on the pressure detection device, and the change of the relationship curve is reflected in the existence of a clear pressure inflection point on the relationship curve, which represents the boundary point on the relationship curve between the two processes of the gas medium quickly filling the sample chamber from the reference chamber and infiltrating into the pores of the shale sample to be tested after filling the sample chamber.

[0075] Optionally, the pressure inflection point usually occurs where the pressure change rate changes from a rapid decrease to a slow decrease, that is, where the slope of the curve changes most significantly. Figure 5 For Figure 4 The partial relationship curve intercepted by the complete relationship curve shown is shown in Figure 5 As shown, the relationship curve at P2 changes from steep to gentle, indicating that the gas medium quickly fills the sample chamber from the reference chamber and begins to penetrate into the pores of the shale sample to be tested until the pressure reaches equilibrium. Therefore, P2 can be regarded as a pressure inflection point, and the pressure inflection point is determined as the target time point.

[0076] S303: Determine the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time.

[0077] Optionally, the first detection time is the detection time corresponding to the pressure in the reference chamber being in a stable state after the gas medium is input into the reference chamber, and the second detection time is the detection time corresponding to the gas medium expanding from the reference chamber to the sample chamber, and the reference chamber and the sample chamber being in a pressure equilibrium state. Among them, the gas medium is input into the reference chamber from the helium bottle according to the preset pressure, and the pressure in the reference chamber is in a stable state, which means that as the gas medium is filled, the pressure in the reference chamber will gradually rise until it reaches the same equilibrium state as the preset pressure, that is, when the pressure in the reference chamber is the same as the preset pressure, no longer changes, or the change is very small, that is, when dynamic equilibrium is reached, it can be considered that the pressure in the reference chamber is in a stable state. And the reference chamber and the sample chamber are in a pressure equilibrium state, which means that the pressures between the reference chamber and the sample chamber tend to be consistent, that is, when there is no obvious gas flow between the reference chamber and the sample chamber, it can be considered that the reference chamber and the sample chamber are in a pressure equilibrium state.

[0078] Optionally, the total volume and skeleton volume of the shale sample to be tested are important parameters for calculating the porosity of the shale sample to be tested. According to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time, the total volume and skeleton volume of the shale sample to be tested are determined respectively, and then the porosity of the shale sample to be tested is determined. Figure 4 As shown, the pressure information corresponding to the target time point is P2, the first pressure information corresponding to the first detection time is P1, and the second pressure information corresponding to the second detection time is P3.

[0079] Based on this, according to the shale porosity testing method provided in the embodiment of the present application, the necessary parameters for calculating the porosity can be obtained by performing a test once using a dual-chamber porosity gas testing device, and a method for determining the total volume and skeleton volume of the shale sample to be tested without the aid of physical measuring tools such as a vernier caliper is provided. Based on the pressure information detected by the pressure detection device, a pressure-time relationship curve is drawn to indicate the changing trend of the pressure information over time. By analyzing the relationship curve, the boundary time point of the gas medium filling the sample chamber through the reference chamber and the gas medium filling the sample chamber and then infiltrating into the shale sample to be tested placed in the sample chamber is determined to obtain the target time point, and the first detection time corresponding to the pressure in the reference chamber being in a stable state after the gas medium is input into the reference chamber, and the second detection time corresponding to the gas medium expanding from the reference chamber to the sample chamber and the reference chamber and the sample chamber being in a pressure equilibrium state are selected, and then the pressure information corresponding to the target time point, the first detection time and the second detection time are used to respectively determine the total volume and skeleton volume of the shale sample to be tested, and then determine the porosity of the shale sample to be tested. On this basis, the shale porosity testing method provided in the embodiment of the present application does not require the shape of the shale sample to be tested. Regardless of whether the shape of the shale sample to be tested is regular, the porosity of the shale sample to be tested can be accurately calculated, and the total volume and skeleton volume of the shale sample to be tested are determined by the pressure information corresponding to the appropriate time point. The two can be compared, thereby reducing the system error while further improving the test accuracy of the porosity of low-porosity and low-permeability rocks such as shale.

[0080] As a possible implementation manner, the above step S302 determines the target time point according to the relationship curve, including: determining curve slope change information according to the relationship curve; and determining the target time point according to the curve slope change information.

[0081] Optionally, the curve slope change information is used to reflect the speed of pressure change. At different stages of the relationship curve, the curve slope will have different expressions. For example, a steep curve slope indicates a faster pressure change, and a gentle curve slope indicates a slower pressure change.

[0082] For example, in combination Figure 2 and Figure 4 As shown, the gas medium can be helium. The first valve is opened, and helium is introduced from the helium bottle into the reference chamber according to a preset pressure, such as 200 psi, and the first valve is closed. When the pressure in the reference chamber is the same as the preset pressure, it is determined that the current pressure is in a stable state. This process corresponds to Figure 4The curve segment corresponding to P1 in the figure is then opened, and the helium in the reference chamber expands rapidly and fills the sample chamber, and penetrates into the pores of the shale sample to be tested placed in the sample chamber until the reference chamber and the sample chamber are in a pressure equilibrium state. In this process, the process of helium in the reference chamber filling the sample chamber develops relatively quickly, while the process of helium penetrating into the pores of the shale sample to be tested develops relatively slowly, so the process of helium filling the sample chamber corresponds to Figure 4 The curve segment corresponding to P1 to P2 in the figure shows that the curve segment drops significantly and has a steep slope, which means that the pressure changes rapidly. The process of helium infiltrating into the pores of the shale sample to be tested corresponds to Figure 4 The curve segment corresponding to P2 to P3 is obviously tending to be flat, and the slope of the curve is stable, that is, the pressure changes slowly.

[0083] For example, based on Figure 4 The relationship curve shown in the figure calculates the curve slope corresponding to different time periods of the relationship curve, determines the position where the curve slope changes most significantly, that is, the turning point where the curve slope decreases from a rapid decrease to a slow decrease, and determines the turning point as the target time point.

[0084] Based on this, by analyzing the relationship curve, the trend of pressure change over time can be obtained, and the position where the slope of the curve changes most significantly can be determined based on the change trend, and then the target time point can be determined. This target time point is crucial for understanding the permeability characteristics of the gas medium.

[0085] Figure 6 A schematic diagram of a target association relationship determination method provided in an embodiment of the present application is shown. As a possible implementation method, refer to Figure 6 As shown, before the above step S303 determines the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time, the method further includes:

[0086] S601. Acquire third pressure information of each standard sample placed in the sample chamber detected by a pressure detection device.

[0087] Optionally, the third pressure information includes pressure information when the gas medium is input into the reference chamber and the pressure in the reference chamber is in a stable state, and pressure information when the gas medium expands from the reference chamber to the sample chamber and the reference chamber and the sample chamber are in a pressure equilibrium state.

[0088] Optionally, the standard sample can be a stainless steel standard, combined with Figure 2The dual-chamber porosity gas measuring device shown is a device for placing a stainless steel standard sample of a certain volume in the sample chamber, opening the first valve, inputting helium in the helium bottle into the reference chamber at a predetermined pressure (200psi), closing the first valve, and reading the pressure value P on the pressure gauge when the pressure in the reference chamber is in a stable state. At this time, the pressure value P also represents the initial pressure of the reference chamber, and then opening the second valve to allow the helium in the reference chamber to expand into the sample chamber where the standard sample is placed. The difference here from placing the shale sample to be tested in the sample chamber is that there is no process of gas medium infiltrating the standard sample, that is, when the helium fills the sample chamber where the standard sample is placed and the reference chamber and the sample chamber are in a pressure equilibrium state, reading the pressure value P0 displayed on the pressure gauge. At this time, the pressure value P0 also represents the pressure after expansion.

[0089] Optionally, based on the above test process, the pressure information corresponding to multiple standard samples at different test times can be tested respectively, and then the linear relationship between the volume information of the standard sample and the value of P / P0 can be determined in combination with Boyle's law. The linear relationship is shown in the following formula (1):

[0090] P× V 参比室 =P0×(V 参比室 + V 样品室 -V 样 ) (1)

[0091] Where P is the initial pressure of the reference chamber, P0 is the pressure after expansion, and V 参比室 Represents the volume of the reference chamber, V 样品室 Represents the volume of the sample chamber, V 样 Indicates the volume of the standard sample.

[0092] For example, as shown in Table 1 below, 5 standard samples may be used for testing respectively to obtain corresponding pressure data.

[0093] Table 1 Standard sample pressure data table

[0094]

[0095] S602: Perform fitting processing on the preset correlation relationship according to the third pressure information and the volume information of each standard sample to obtain a target correlation relationship.

[0096] Optionally, the preset correlation relationship is used to indicate the correlation relationship between the initial pressure of the reference chamber, the volume of the reference chamber, the volume of the sample chamber and the volume information of the standard sample, and the target correlation relationship is used to indicate the linear relationship between the volume information and pressure information of the shale sample to be tested.

[0097] For example, based on the above formula (1), a preset association relationship can be further derived, and the preset association relationship is shown in the following formula (2):

[0098] V 样 = - V 参比室 ×(P / P0)+ V 参比室 + V 样品室 (2)

[0099] Where P is the initial pressure of the reference chamber, P0 is the pressure after expansion, and V 参比室 Represents the volume of the reference chamber, V 样品室 Represents the volume of the sample chamber, V 样 Indicates the volume of the standard sample.

[0100] Exemplarily, the preset association relationship shown in the above formula (2) is linearly transformed to obtain the initial linear relationship shown in the following formula (3):

[0101] V 样 = a ×(P / P0)+b (3)

[0102] Among them, V 样 represents the volume of the standard sample, a and b represent linear parameters, P represents the initial pressure of the reference chamber, and P0 represents the pressure after expansion.

[0103] Furthermore, the initial linear relationship shown in the above formula (3) is fitted using the pressure information of multiple standard samples shown in Table 1, and the above linear parameters a and b are determined to be -17.586 and 65.976, thereby obtaining the target correlation relationship. Figure 7 As shown, the horizontal axis represents pressure information, and the vertical axis represents volume information. The target association relationship obtained after fitting is shown in the following formula (4):

[0104] y=-17.586x+65.976 (4)

[0105] Wherein, y represents the volume information of the shale sample to be tested, in ml, and x represents the value of P / P0.

[0106] Based on this, the dual-chamber porosity gas testing device is calibrated according to Boyle's law, and the linear relationship between P / P0 and the volume of the standard sample is obtained by testing the stainless steel standard sample with a determined volume, and then the target correlation relationship indicating the linear relationship between the volume information and the pressure information of the shale sample to be tested is determined. Therefore, the embodiment of the present application is applicable to the standard sample of known volume, and the linear relationship between the pressure information and the volume information is established, so that when the shale sample to be tested is applied for testing, the target correlation relationship is further determined based on the linear relationship to more accurately determine the total volume and porosity of the shale sample to be tested.

[0107] Figure 8 A schematic diagram of a porosity determination method provided in an embodiment of the present application is shown. As a possible implementation method, refer to Figure 8 As shown, the above step S303 determines the porosity of the shale sample to be tested according to the pressure information corresponding to the target time point, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time, and specifically includes the following steps:

[0108] S801. Determine the total volume of the shale sample to be tested according to the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time.

[0109] Optionally, combined Figure 4 As shown, the pressure information corresponding to the target time point is P2, and the first pressure information corresponding to the first detection time is P1. The embodiment of the present application uses the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time to calculate the total volume of the shale sample to be tested. Compared with the method of using a vernier caliper to determine the total volume of the shale sample in the prior art, the present application does not need to rely on other auxiliary measurement tools and is not limited by the shape of the shale sample to be tested. Regardless of whether the shape of the shale sample to be tested is regular, the total volume of the shale sample to be tested can be determined by the pressure information P2 corresponding to the target time point and the first pressure information P1 corresponding to the first detection time. In this way, not only does it not require additional physical measurements to determine the total volume of the shale sample to be tested, but it also reduces the errors caused by physical measurements.

[0110] Optionally, the total volume of the shale sample to be tested is determined based on the target association relationship, the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time.

[0111] For example, based on the initial linear relationship obtained by linearly transforming the preset association relationship shown in the above formula (3), the first linear relationship shown in the following formula (5) can be equivalently replaced:

[0112] V 总 = a × (P1 / P2) + b (5)

[0113] Among them, V 总 represents the total volume of the shale sample to be tested, a and b represent linear parameters, P1 represents the first pressure information corresponding to the first detection time, and P2 represents the pressure information corresponding to the target time point.

[0114] For example, based on the first linear relationship shown in the above formula (5), the parameter x in the target association relationship shown in the above formula (4) can be equivalent to the value of P1 / P2, and y can be equivalent to the total volume of the shale sample to be tested. Figure 4The P1 shown is 204.11 psi, P2 is 119.88 psi, and the linear parameters a and b determined by fitting are -17.586 and 65.976, respectively. Using the target correlation relationship shown in the above formula (4), the total volume of the shale sample to be tested is obtained to be 36.034 ml.

[0115] S802: Determine the skeleton volume of the shale sample to be tested according to the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time.

[0116] Optionally, combined Figure 4 As shown, the first pressure information corresponding to the first detection time is P1, and the second pressure information corresponding to the second detection time is P3. The embodiment of the present application performs a test based on the dual-chamber porosity gas testing device to obtain the pressure information for calculating the total volume and skeleton volume of the shale sample to be tested, that is, the collection of all necessary data can be completed in one test. Specifically, the present application uses the first pressure information corresponding to the first detection time and the second pressure information corresponding to the second detection time obtained in the test to calculate the skeleton volume of the shale sample to be tested. Regardless of whether the shape of the shale sample to be tested is regular, the method for determining the skeleton volume is applicable.

[0117] Optionally, the skeleton volume of the shale sample to be tested is determined based on the target association relationship, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time.

[0118] For example, based on the initial linear relationship obtained by linearly transforming the preset association relationship shown in the above formula (3), the second linear relationship shown in the following formula (6) can be equivalently replaced:

[0119] V 骨 = a × (P1 / P3) + b (6)

[0120] Among them, V 骨 represents the skeleton volume of the shale sample to be tested, a and b represent linear parameters, P1 represents the first pressure information corresponding to the first detection time, and P3 represents the second pressure information corresponding to the second detection time.

[0121] For example, based on the first linear relationship shown in the above formula (6), the parameter x in the target association relationship shown in the above formula (4) can be equivalent to the value of P1 / P3, and y is equivalent to the skeleton volume of the shale sample to be tested. Figure 4 The P1 shown is 204.11psi, P3 is 116.65psi, and the linear parameters a and b determined by fitting are -17.586 and 65.976, respectively. Using the target correlation relationship shown in the above formula (4), the skeleton volume of the shale sample to be tested is obtained to be 35.205ml.

[0122] S803. Determine the porosity of the shale sample to be tested according to the total volume and the skeleton volume.

[0123] Optionally, since the volume of the sample chamber is fixed, while the volume of the shale sample to be tested is not fixed and has different sizes, when the shale sample to be tested is placed in the sample chamber, there are the following two situations: situation 1: the volume of the shale sample to be tested is similar to the volume of the sample chamber, and the idle volume (dead volume) in the sample chamber is relatively small; situation 2: the volume of the shale sample to be tested is quite different from the volume of the sample chamber, and the dead volume in the sample chamber is relatively large. The dead volume refers to the part of the sample chamber that is not filled by the shale sample to be tested.

[0124] Since the size of the dead volume in the sample chamber will affect the systematic error of the porosity of the shale sample to be tested using the dual-chamber porosity gas testing system, for the above situation one, the first volume difference corresponding to the shale sample to be tested can be determined based on the total volume and the skeleton volume, and the ratio of the total volume of the shale sample to be tested and the first volume difference can be used as the porosity of the shale sample to be tested.

[0125] Exemplarily, the porosity of the shale sample to be tested is determined according to the following formula (7):

[0126] φ=(V 总 -V 骨 ) / V 总 (7)

[0127] Where, φ represents the porosity of the shale sample to be tested, V 总 Represents the total volume of the shale sample to be tested, V 骨 Represents the skeleton volume of the shale sample to be tested, V 总 -V 骨 Represents the first volume difference.

[0128] Optionally, for the above situation 2, in order to reduce the system error, a target standard sample of preset volume can be placed in the sample chamber, and the target standard sample is used to reduce the free volume in the sample chamber. That is to say, the volume of the target standard sample is known, and when the shale sample to be tested is placed in the sample chamber, the target standard sample of known volume is also placed in the sample chamber to reduce the dead volume in the sample chamber. The volume of the target standard sample can be determined based on the volume difference between the sample chamber volume and the volume of the shale sample to be tested. On this basis, the above step S803 determines the porosity of the shale sample to be tested based on the total volume and the skeleton volume, and also includes:

[0129] The volume information of the target standard sample is obtained; the porosity of the shale sample to be tested is determined according to the total volume, the skeleton volume and the volume information of the target standard sample.

[0130] Optionally, when the standard sample in the sample chamber is replaced with the shale sample to be tested for testing, in order to reduce the idle volume in the sample chamber, that is, to reduce the dead volume of the sample chamber to reduce the system error, the target standard sample can be a standard sample with a volume of 12.759 ml.

[0131] Optionally, the target total volume of the shale sample to be tested is determined based on the total volume and the volume information of the target standard sample; the target skeleton volume of the shale sample to be tested is determined based on the skeleton volume and the volume information of the target standard sample; the second volume difference corresponding to the shale sample to be tested is determined based on the target total volume and the target skeleton volume; and the ratio of the target total volume to the second volume difference is used as the porosity of the shale sample to be tested.

[0132] For example, taking the target standard sample volume of 12.759 ml, P1 of 204.11 psi, P2 of 119.88 psi, and P3 of 116.65 psi as an example, based on the total volume of the shale sample to be tested determined to be 36.034 ml based on P1 and P2, and based on the skeleton volume of the shale sample to be tested determined to be 35.205 ml based on P1 and P3, the volume of the target standard sample of 12.759 ml is deducted respectively, and the target total volume of the shale sample to be tested is 23.275 ml, and the target skeleton volume is 22.446 ml.

[0133] Further, based on the target total volume of 23.275 ml and the target skeleton volume of 22.446 ml, the second volume difference is 0.829 ml, and based on the ratio of the target total volume of 23.275 ml and the second volume difference of 0.829 ml, the porosity of the shale sample to be tested is determined to be 3.56%.

[0134] Based on this, since the pressure value of the curve inflection point P2 representing the total volume of the shale sample to be tested in the embodiment of the present application must be greater than the pressure value of the equilibrium pressure P3 representing the skeleton volume of the shale sample to be tested, the unreasonable result of the porosity being a negative number will not be obtained. And based on the dual-chamber porosity gas testing system provided in the embodiment of the present application for shale porosity testing, the use of a vernier caliper or other physical measurement methods to measure the total volume of the shale sample to be tested is omitted, so the shale porosity testing method provided in the embodiment of the present application is applicable to special-shaped samples that are inconvenient to measure. In addition, unlike the measurement of the total volume and skeleton volume of the sample in the traditional method, the shale porosity testing method provided in the embodiment of the present application is essentially to measure the pressure value of the curve inflection point on the relationship curve and the equilibrium pressure, thereby reducing the system error caused by physical measurement.

[0135] The present application embodiment also provides a processing device 900, such as Fig. 9As shown, it is a schematic diagram of the structure of a processing device 900 provided in an embodiment of the present application, including: a processor 901, a memory 902, and optionally, a bus 903. The memory 902 stores machine-readable instructions executable by the processor 901. When the processing device 900 is running, the processor 901 communicates with the memory 902 through the bus 903. When the machine-readable instructions are executed by the processor 901, the steps of the shale porosity testing method as described in any one of the above items are performed.

[0136] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned shale porosity testing methods are executed.

[0137] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0138] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or part of the technical solution that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program code.

[0139] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A shale porosity testing method, characterized in that: A processing device used in a dual-chamber porosity gas measurement system, the dual-chamber porosity gas measurement system comprising the processing device and a dual-chamber porosity gas measurement device, the dual-chamber porosity gas measurement device comprising at least a reference chamber, a sample chamber and a pressure detection device, the reference chamber is connected to the sample chamber through a pipeline, and the pressure detection device is arranged on the pipeline; the method comprising: Obtaining pressure information corresponding to each detection time detected by the pressure detection device, and generating a relationship curve according to each detection time and the pressure information corresponding to each detection time, wherein the relationship curve is used to indicate a change trend of the pressure information detected by the pressure detection device over time; According to the relationship curve, a target time point is determined, wherein the target time point is a boundary time point when the gas medium fills the sample chamber through the reference chamber and when the gas medium fills the sample chamber and then infiltrates into the shale sample to be tested placed in the sample chamber; Determine the total volume of the shale sample to be tested according to the target association relationship, the pressure information corresponding to the target time point and the first pressure information corresponding to the first detection time, wherein the target association relationship is used to indicate a linear relationship between the volume information and the pressure information of the shale sample to be tested, and the first detection time is the detection time corresponding to the pressure in the reference chamber being in a stable state after the gas medium is input into the reference chamber; Determine the skeleton volume of the shale sample to be tested according to the target association relationship, the first pressure information corresponding to the first detection time, and the second pressure information corresponding to the second detection time, wherein the second detection time is the detection time corresponding to the expansion of the gas medium from the reference chamber to the sample chamber and the reference chamber and the sample chamber are in a pressure equilibrium state; The porosity of the shale sample to be tested is determined according to the total volume and the skeleton volume.

2. The shale porosity testing method according to claim 1, characterized in that: Determining the target time point according to the relationship curve includes: According to the relationship curve, determining curve slope change information; The target time point is determined according to the curve slope change information.

3. The shale porosity testing method according to claim 1, characterized in that: Before determining the porosity of the shale sample to be tested, the method further includes: Acquiring third pressure information of each standard sample placed in the sample chamber detected by the pressure detection device, the third pressure information including pressure information when the gas medium is input into the reference chamber and the pressure in the reference chamber is in a stable state, and pressure information when the gas medium expands from the reference chamber to the sample chamber and the reference chamber and the sample chamber are in a pressure equilibrium state; According to the third pressure information and the volume information of each of the standard samples, the preset correlation relationship is fitted to obtain a target correlation relationship, wherein the preset correlation relationship is used to indicate the correlation relationship between the initial pressure of the reference chamber, the volume of the reference chamber, the volume of the sample chamber and the volume information of the standard sample, and the target correlation relationship is used to indicate the linear relationship between the volume information and the pressure information of the shale sample to be tested.

4. The shale porosity testing method according to claim 1, characterized in that: Determining the porosity of the shale sample to be tested according to the total volume and the skeleton volume includes: Determining a first volume difference corresponding to the shale sample to be tested according to the total volume and the skeleton volume; The ratio of the total volume of the shale sample to be tested to the first volume difference is used as the porosity of the shale sample to be tested.

5. The shale porosity testing method according to claim 1, characterized in that: A target standard sample of a preset volume is also placed in the sample chamber, and the target standard sample is used to reduce the idle volume in the sample chamber; the porosity of the shale sample to be tested is determined according to the total volume and the skeleton volume, and further includes: Acquiring volume information of the target standard sample; The porosity of the shale sample to be tested is determined according to the total volume, the skeleton volume and the volume information of the target standard sample.

6. The shale porosity testing method according to claim 5, characterized in that: The step of determining the porosity of the shale sample to be tested according to the total volume, the skeleton volume and the volume information of the target standard sample comprises: Determining the target total volume of the shale sample to be tested according to the total volume and the volume information of the target standard sample; Determining a target skeleton volume of the shale sample to be tested according to the skeleton volume and the volume information of the target standard sample; Determining a second volume difference corresponding to the shale sample to be tested according to the target total volume and the target skeleton volume; The ratio of the target total volume to the second volume difference is used as the porosity of the shale sample to be tested.

7. A processing device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the processing device is running, the processor executes the machine-readable instructions to perform the steps of the shale porosity testing method according to any one of claims 1 to 6.

8. A dual-chamber porosity gas measurement system, characterized in that: The dual-chamber porosity gas measurement system comprises the processing equipment according to claim 7 and the dual-chamber porosity gas measurement device, wherein the dual-chamber porosity gas measurement device comprises at least: a reference chamber, a sample chamber and a pressure detection device; The reference chamber is connected to the sample chamber via a pipeline, the pressure detection device is arranged on the pipeline, a first valve is arranged on the pipeline between the reference chamber and the gas medium source, a second valve is arranged on the pipeline connecting the reference chamber and the sample chamber, and the processing equipment is communicatively connected to the pressure detection device; The processing equipment is used to perform porosity testing on a shale sample to be tested based on the method described in any one of claims 1 to 6.

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