Method for calculating coal rock gas adsorption quantity based on nuclear magnetic resonance T2 cutoff value

Abstract

The invention discloses a method for calculating coal rock gas adsorption capacity based on a nuclear magnetic resonance T2 cutoff value, which comprises the following steps: acquiring a plurality of coal rock samples, and measuring the ash content of the coal rock samples; performing saturated water nuclear magnetic resonance testing on the coal rock sample to obtain a nuclear magnetic resonance T2 spectrum in a saturated water state, and performing centrifugal treatment on the coal rock sample in the saturated water state to obtain a nuclear magnetic resonance T2 spectrum in a bound water state; based on the nuclear magnetic resonance T2 spectrum, obtaining a nuclear magnetic resonance T2 cutoff value of the coal rock sample; testing the adsorbed gas content of the coal rock sample to obtain the adsorbed gas content of the coal rock sample; establishing an adsorbed gas content calculation model through regression analysis; and inputting the ash content and the nuclear magnetic resonance T2 cutoff value of the to-be-detected coal rock sample into the adsorbed gas content calculation model to obtain the adsorbed gas content of the to-be-detected coal rock sample. According to the invention, the high cost of the experiment is reduced, and the coal rock gas exploration and development efficiency is obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological exploration, in particular to a method for calculating coal rock gas adsorption capacity based on nuclear magnetic resonance T2 cutoff value. BACKGROUND

[0002] Coal rock gas is an important field in the unconventional oil and gas field, and its exploration and development are being carried out vigorously. The evaluation of coal rock gas content is a key link in the exploration and development of coal rock gas resources. According to the occurrence mode of coal rock gas, it can be divided into adsorbed gas and free gas. Adsorbed gas refers to the gas stored in the form of adsorption on the surface of organic matter particles, and its content is particularly rich in deep coal rock gas reservoirs. Relying on the rich micropore structure of the coal matrix, it is adsorbed on the pore wall through intermolecular forces such as van der Waals force and hydrogen bond, and usually accounts for 70% to 90% of the total amount of coal rock gas, which is the main contributor to coal rock gas resources. Coal rock gas mainly exists in the form of adsorbed gas in the coal seam underground, therefore, the calculation of the underground adsorption capacity of coal rock gas is of great significance for the evaluation of deep coal rock gas resource potential, the selection of favorable target areas and the development plan.

[0003] At present, the test of coal rock adsorbed gas content mainly relies on methane adsorption experiment under high temperature and high pressure conditions. The commonly used methane adsorption experiment methods under high temperature and high pressure conditions mainly include volume method, weight method and more advanced nuclear magnetic resonance (NMR) technology. Specifically, the volume method calculates the adsorption capacity by accurately monitoring the pressure change of the gas in a fixed volume system; the weight method directly measures the small mass difference of the coal sample before and after adsorbing methane by using a high-precision balance, so as to accurately quantify the adsorption capacity; and the NMR technology can deeply and intuitively show the distribution of methane molecules in micropores by capturing the unique response of methane molecules in a magnetic field during the adsorption process, which provides a new perspective for exploring the behavior of coal adsorbing methane. However, the above experimental methods have problems such as high experimental condition requirement and high test cost.

[0004] The present application adopts a more convenient and fast water-saturated nuclear magnetic resonance experiment, combines the coal quality characteristics of coal rock, and establishes a calculation method for calculating the adsorption capacity of coal rock gas based on nuclear magnetic resonance T2 cutoff value, which has the advantages of simpler experimental conditions, more affordable experimental cost, and important significance for large-scale exploration and development of coal rock gas. SUMMARY

[0005] To solve the above problems, the present application provides a method for calculating the adsorption capacity of coal rock gas based on nuclear magnetic resonance T2 cutoff value, which aims to solve the problem of harsh test conditions and high test cost of coal rock adsorbed gas content.

[0006] The first aspect of the embodiment of the present application provides a method for calculating the adsorption capacity of coal rock gas based on nuclear magnetic resonance T2 cutoff value, comprising: Obtaining a plurality of coal rock samples, and determining ash content of the coal rock samples; Performing a saturated water nuclear magnetic resonance test on the coal rock samples to obtain a nuclear magnetic resonance T2 spectrum under a saturated water state, performing a centrifugal treatment on the coal rock samples under the saturated water state to obtain a nuclear magnetic resonance T2 spectrum under a bound water state; and obtaining a nuclear magnetic resonance T2 cutoff value of the coal rock samples based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state. Performing an adsorbed gas content test on the coal rock samples to obtain an adsorbed gas content of the coal rock samples; and establishing an adsorbed gas content calculation model through regression analysis based on the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content of the coal rock samples. Inputting the ash content and the nuclear magnetic resonance T2 cutoff value of the coal rock samples to be tested into the adsorbed gas content calculation model to obtain the adsorbed gas content of the coal rock samples to be tested.

[0007] In an alternative embodiment, the nuclear magnetic resonance T2 cutoff value of the coal rock samples is obtained based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state, and the specific steps are as follows: A saturated water cumulative porosity curve is plotted according to the nuclear magnetic resonance T2 spectrum under the saturated water state. A bound water cumulative porosity curve is plotted according to the nuclear magnetic resonance T2 spectrum under the bound water state. A straight line parallel to the nuclear magnetic resonance T2 time axis is drawn at the maximum value of the bound water cumulative porosity curve, and the straight line intersects with the saturated water cumulative porosity curve at a point. A perpendicular line of the nuclear magnetic resonance T2 time axis is drawn through the intersection point, and the nuclear magnetic resonance T2 value corresponding to the intersection point of the perpendicular line and the nuclear magnetic resonance T2 time axis is the nuclear magnetic resonance T2 cutoff value.

[0008] In an alternative embodiment, the adsorbed gas content calculation model is a monadic regression equation of the ash content and the adsorbed gas content:

[0009] wherein, is the adsorbed gas content of the coal rock, is the ash content.

[0010] In an alternative embodiment, the adsorbed gas content calculation model is a monadic regression equation of the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content:

[0011] wherein, is the adsorbed gas content of the coal rock, is the nuclear magnetic resonance T2 cutoff value.

[0012] In an alternative embodiment, the adsorbed gas content calculation model is a binary regression equation of ash content and nuclear magnetic resonance T2 cutoff value and adsorbed gas content:

[0013] wherein, is the adsorbed gas content of the coal rock, is the ash content, is the nuclear magnetic resonance T2 cutoff value.

[0014] In an alternative embodiment, before the coal rock sample is subjected to the saturated water nuclear magnetic resonance test, the method further comprises a sample preparation step of preparing the coal rock sample into a plunger with a diameter of 25 mm and a height of 50 mm.

[0015] In an alternative embodiment, the centrifugal treatment has a pressure of 1.38 MPa and a time of 90 minutes.

[0016] The second aspect of the embodiment of the present application provides a device for calculating the adsorbed gas content of coal rock based on the nuclear magnetic resonance T2 cutoff value, and the device comprises: a data acquisition module configured to acquire a plurality of coal rock samples and determine the ash content of the coal rock samples; a T2 cutoff value calculation module configured to perform a saturated water nuclear magnetic resonance test on the coal rock samples to obtain a nuclear magnetic resonance T2 spectrum under a saturated water state, perform a centrifugal treatment on the coal rock samples under the saturated water state to obtain a nuclear magnetic resonance T2 spectrum under a bound water state, and obtain the nuclear magnetic resonance T2 cutoff value of the coal rock samples based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state; a model construction module configured to perform an adsorbed gas content test on the coal rock samples to obtain the adsorbed gas content of the coal rock samples, and establish an adsorbed gas content calculation model through regression analysis based on the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content of the coal rock samples; a prediction module configured to input the ash content and the nuclear magnetic resonance T2 cutoff value of a coal rock sample to be tested into the adsorbed gas content calculation model to obtain the adsorbed gas content of the coal rock sample to be tested.

[0017] The third aspect of the embodiment of the present application provides an electronic device, which comprises a processor, a memory, and a computer program stored in the memory and executable on the processor, and the processor implements the method for calculating the adsorbed gas content of coal rock based on the nuclear magnetic resonance T2 cutoff value when executing the program.

[0018] The fourth aspect of the embodiment of the present application provides a computer readable storage medium, characterized in that the computer readable storage medium stores a computer program, and the computer program is executed by a processor to calculate the coal rock gas adsorption amount based on the nuclear magnetic resonance T2 cutoff value.

[0019] The present application has at least the following advantages or beneficial effects: The present application provides a method for calculating the coal rock gas adsorption amount, which is lower in cost, more convenient and faster. The industrial component analysis and the saturated water nuclear magnetic resonance experiment parameters commonly used in the coal rock gas research are used to avoid the high-pressure isothermal adsorption experiment test which is high in price and harsh in experimental conditions. The coal rock gas adsorption amount can be obtained by the formula calculation, which is beneficial to the analysis of the coal rock gas adsorption amount of a large area, multiple well areas and multiple samples, and has important significance for the large-scale exploration and development of coal rock gas. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a flow chart of a method for calculating the coal rock gas adsorption amount based on the nuclear magnetic resonance T2 cutoff value according to an embodiment of the present application; Figure 2 is a nuclear magnetic resonance T2 cutoff value calculation method diagram according to an embodiment of the present application; Figure 3 (a) is a linear regression diagram of ash content and adsorbed gas content according to an embodiment of the present application, Figure 3 (b) is a linear regression diagram of nuclear magnetic resonance T2 cutoff value and adsorbed gas content according to an embodiment of the present application; Figure 4 is a binary regression analysis diagram according to an embodiment of the present application; Figure 5 is a binary regression linear fitting diagram according to an embodiment of the present application; Figure 6 is a structure diagram of a device for calculating the coal rock gas adsorption amount based on the nuclear magnetic resonance T2 cutoff value according to an embodiment of the present application; Figure 7 is a schematic diagram of an electronic device according to the present application. DETAILED DESCRIPTION

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a method for calculating coalbed methane adsorption based on the T2 cutoff value of nuclear magnetic resonance, as proposed in an embodiment of this application. Figure 1 As shown, a method for calculating the adsorption amount of coal shale gas based on the nuclear magnetic resonance T2 cutoff value includes: S100: Obtain multiple coal and rock samples and determine the ash content of the coal and rock samples; In this embodiment, coal core samples of different coal ranks from the Benxi Formation of the Carboniferous system were collected from the Mizhi, Shenmu, and Nalinhe areas of the Ordos Basin. Each sample was divided into three parts for testing of coal industrial composition, adsorbed gas content, and saturated water nuclear magnetic resonance. Industrial analysis was also conducted on the samples to obtain their ash content.

[0024] S200: Perform saturated water nuclear magnetic resonance (NMR) testing on the coal and rock sample to obtain the NMR T2 spectrum under saturated water conditions; centrifuge the coal and rock sample under saturated water conditions to obtain the NMR T2 spectrum under bound water conditions; based on the NMR T2 spectrum under saturated water conditions and the NMR T2 spectrum under bound water conditions, obtain the NMR T2 cutoff value of the coal and rock sample. In this embodiment, before performing saturated nuclear magnetic resonance testing on the coal and rock samples, a sample preparation step is also included: S210: Prepare a plunger with a diameter of 25 mm and a height of 50 mm from the coal and rock sample; number the coal sample after preparation, and then put the coal sample into a drying oven for drying at 60°C until the weight of the coal sample stops changing.

[0025] S220: All coal and rock samples were saturated with water for 24 hours under vacuum conditions (vacuum pressure of -0.1MPa). After saturation, nuclear magnetic resonance analysis was carried out to obtain the nuclear magnetic resonance T2 spectrum under saturated water conditions. S230: After the saturated water test, the coal and rock samples were centrifuged at 1.38 MPa for 90 minutes to convert the samples into bound water state. Then, nuclear magnetic resonance analysis was performed to obtain the nuclear magnetic resonance T2 spectrum in the bound water state.

[0026] S240: As Figure 2As shown, based on the nuclear magnetic resonance T2 spectrum under saturated water and bound water conditions, the nuclear magnetic resonance T2 cutoff value of the coal and rock samples is obtained. The specific steps are as follows: S241: Plot the cumulative porosity curve of saturated water based on the nuclear magnetic resonance T2 spectrum under the saturated water state; S242: Plot the cumulative porosity curve of bound water based on the nuclear magnetic resonance T2 spectrum of the bound water state; S243: Draw a straight line parallel to the nuclear magnetic resonance T2 time axis at the maximum value of the cumulative porosity curve of the bound water, and the straight line intersects the cumulative porosity curve of the saturated water at a point; S244: Draw a perpendicular line from the intersection point to the T2 time axis of the nuclear magnetic resonance (NMR). The NMR T2 value corresponding to the intersection point of this perpendicular line and the T2 time axis is the NMR T2 cutoff value.

[0027] The results of the analysis and testing of the coal and rock samples are shown in Table 1: Table 1

[0028] S300: The adsorbed gas content of the coal and rock sample is tested to obtain the adsorbed gas content of the coal and rock sample; based on the ash content, nuclear magnetic resonance T2 cutoff value and adsorbed gas content of the coal and rock sample, an adsorbed gas content calculation model is established through regression analysis; In this embodiment, the coal sample was prepared with a particle size of 0.25 mm to 0.18 mm (60 mesh to 80 mesh) for coal rock adsorption gas content testing. The results of the high-pressure isothermal adsorption test for methane in the coal rock sample are shown in Table 2. Table 2

[0029] Regression results as follows Figure 3 As shown in (a), the calculation model for the adsorbed gas content is a univariate regression equation between the ash content and the adsorbed gas content: (R) 2 =0.84) in, The content of adsorbed gas in coal and rock. This refers to the ash content.

[0030] Regression results as follows Figure 3 As shown in (b), the calculation model for the adsorbed gas content is a univariate regression equation between the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content: (R) 2 =0.91) in, The content of adsorbed gas in coal and rock. This is the T2 cutoff value for nuclear magnetic resonance.

[0031] The calculation model for the adsorbed gas content is a binary regression equation between ash content, NMR T2 cutoff value, and adsorbed gas content: (R) 2 =0.93) in, The content of adsorbed gas in coal and rock. Ash content, This is the T2 cutoff value for nuclear magnetic resonance.

[0032] Regression results as follows Figure 4 , Figure 5 As shown, the bivariate regression equation R 2 The value is significantly larger than that of the univariate regression equation, the predicted value is very close to the actual value, and the regression result is reliable.

[0033] S400: Input the ash content and nuclear magnetic resonance T2 cutoff value of the coal and rock sample to be tested into the adsorbed gas content calculation model to obtain the adsorbed gas content of the coal and rock sample to be tested.

[0034] In this embodiment, three coal and rock samples were collected, and industrial composition, saturated water nuclear magnetic resonance, and high-pressure methane isothermal adsorption tests were conducted. The adsorbed gas content was calculated using the calculation method of this patent, and the results are shown in Table 3. Table 3

[0035] The measured adsorbed gas content of sample 1 was 15.561 mg / L. 3 / t, the adsorbed gas content calculated by the method of this patent is 15.314m. 3 / t, error 1.59%; measured adsorbed gas content of sample 2 was 13.412m. 3 / t, the adsorbed gas content calculated by the method of this patent is 13.452m. 3 / t, error 0.30%; measured adsorbed gas content of sample 3 was 13.156m³. 3 / t, the adsorbed gas content calculated by the method of this patent is 13.326m. 3 / t, with an error of 1.29%. The error in the coal and rock adsorbed gas content calculated by this method is less than 2%. The technology of this invention is accurate and reliable, and the calculation effect is good.

[0036] Furthermore, the centrifugation process is carried out at a pressure of 1.38 MPa for 90 minutes.

[0037] Please refer to Figure 6 , Figure 6 This is a structural diagram of a device for calculating coal gas adsorption based on the T2 cutoff value of nuclear magnetic resonance, as proposed in an embodiment of this application.Figure 6 As shown in the figure, this disclosure also provides a device for calculating the adsorption amount of coalbed methane based on the nuclear magnetic resonance T2 cutoff value. The device includes: a data acquisition module 601, a T2 cutoff value calculation module 602, a model construction module 603, and a prediction module 604; wherein, The data acquisition module 601 is configured to acquire multiple coal and rock samples and determine the ash content of the coal and rock samples. The T2 cutoff value calculation module 602 is configured to perform water-saturated nuclear magnetic resonance (NMR) testing on the coal and rock sample to obtain the NMR T2 spectrum under water saturation, centrifuge the coal and rock sample under water saturation to obtain the NMR T2 spectrum under bound water; and obtain the NMR T2 cutoff value of the coal and rock sample based on the NMR T2 spectrum under water saturation and bound water. The model building module 603 is configured to test the adsorbed gas content of the coal and rock samples to obtain the adsorbed gas content of the coal and rock samples; based on the ash content, nuclear magnetic resonance T2 cutoff value and adsorbed gas content of the coal and rock samples, an adsorbed gas content calculation model is established through regression analysis. The prediction module 604 is configured to input the ash content and nuclear magnetic resonance T2 cutoff value of the coal and rock sample to be tested into the adsorbed gas content calculation model to obtain the adsorbed gas content of the coal and rock sample to be tested.

[0038] This disclosure also provides an electronic device, please refer to... Figure 7 , Figure 7 This is a schematic diagram of an electronic device illustrated in an embodiment of this disclosure. For example... Figure 7 As shown, the electronic device 100 includes a memory 110 and a processor 120. The memory 110 and the processor 120 are connected via a bus for communication. The memory 110 stores a computer program that can run on the processor 120 to implement the steps in the method for calculating the amount of coal gas adsorption based on the nuclear magnetic resonance T2 cutoff value disclosed in this embodiment.

[0039] The disclosed embodiments also provide a computer-readable storage medium that, when the instructions in the computer-readable storage medium are executed by a processor of a computer device, enables the computer device to perform the steps in the method for calculating coalbed methane adsorption based on nuclear magnetic resonance T2 cutoff values ​​as described in the embodiments of this disclosure.

[0040] In summary, this application, by utilizing industrial component analysis data and saturated water NMR experimental parameters conventionally available in coal shale gas research, cleverly avoids the high cost and stringent experimental conditions of traditional high-pressure isothermal adsorption experiments. Based on this method, the adsorption capacity of coal shale gas can be calculated using a simple formula, significantly reducing experimental costs and technical barriers. This method is particularly suitable for large-scale, multi-well-area, and multi-sample coal shale gas adsorption capacity analysis, and can significantly improve the efficiency of coal shale gas exploration and development, possessing significant application value and significance for promoting large-scale coal shale gas exploration and development.

[0041] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, apparatuses, electronic devices, and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0042] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 Figure 1 The steps of the function specified in one or more boxes.

[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0045] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0046] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0047] The above provides a detailed description of a method for calculating coalbed methane adsorption based on the T2 cutoff value of nuclear magnetic resonance. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for calculating the amount of coal rock gas adsorption based on a T2 cutoff value of nuclear magnetic resonance, characterized in that, The method comprises the following steps: a plurality of coal rock samples are obtained, and the ash content of the coal rock samples is determined; a saturated water nuclear magnetic resonance test is performed on the coal rock samples to obtain a nuclear magnetic resonance T2 spectrum under a saturated water state, the coal rock samples under the saturated water state are subjected to centrifugal treatment to obtain a nuclear magnetic resonance T2 spectrum under a bound water state, and a nuclear magnetic resonance T2 cutoff value of the coal rock samples is obtained based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state; an adsorbed gas content test is performed on the coal rock samples to obtain the adsorbed gas content of the coal rock samples, and an adsorbed gas content calculation model is established through regression analysis based on the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content of the coal rock samples; the ash content and the nuclear magnetic resonance T2 cutoff value of a coal rock sample to be tested are input into the adsorbed gas content calculation model to obtain the adsorbed gas content of the coal rock sample to be tested.

2. The method for calculating the coal rock gas adsorption capacity based on the T2 cutoff value of nuclear magnetic resonance according to claim 1, characterized in that, The nuclear magnetic resonance T2 cutoff value of the coal rock sample is obtained based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state, and the specific steps are as follows: a saturated water cumulative porosity curve is plotted according to the nuclear magnetic resonance T2 spectrum under the saturated water state; a bound water cumulative porosity curve is plotted according to the nuclear magnetic resonance T2 spectrum under the bound water state; a straight line parallel to the nuclear magnetic resonance T2 time axis is drawn at the maximum value of the bound water cumulative porosity curve, and the straight line intersects the saturated water cumulative porosity curve at a point; a perpendicular line of the nuclear magnetic resonance T2 time axis is drawn through the intersection point, and the nuclear magnetic resonance T2 value corresponding to the intersection point of the perpendicular line and the nuclear magnetic resonance T2 time axis is the nuclear magnetic resonance T2 cutoff value.

3. The method for calculating the amount of coal rock gas adsorption based on the T2 cutoff value of nuclear magnetic resonance according to claim 1, characterized in that, The adsorbed gas content calculation model is a monadic regression equation of the ash content and the adsorbed gas content: wherein, is the adsorbed gas content of the coal rock, is the ash content.

4. The method for calculating the coal rock gas adsorption capacity based on the T2 cutoff value of nuclear magnetic resonance according to claim 4, characterized in that, The adsorbed gas content calculation model is a monadic regression equation of the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content: wherein, is the adsorbed gas content of the coal rock, is the nuclear magnetic resonance T2 cutoff value.

5. The method for calculating the amount of coal rock gas adsorption based on the T2 cutoff value of nuclear magnetic resonance according to claim 1, characterized in that, The adsorbed gas content calculation model is a binary regression equation of the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content: wherein, is the adsorbed gas content of the coal rock, is the ash content, is the nuclear magnetic resonance T2 cutoff value.

6. The method for calculating the amount of coal rock gas adsorption based on the T2 cutoff value of nuclear magnetic resonance according to claim 1, characterized in that, Before the saturated water nuclear magnetic resonance test is performed on the coal rock samples, a sample preparation step is further included, in which the coal rock samples are prepared into plungers with a diameter of 25 mm and a height of 50 mm.

7. The method for calculating the amount of coal rock gas adsorption based on the T2 cutoff value of nuclear magnetic resonance according to claim 1, characterized in that, The pressure of the centrifugal treatment is 1.38 MPa, and the time is 90 minutes.

8. The device for calculating the amount of coal rock gas adsorption based on the T2 cutoff value of nuclear magnetic resonance according to any one of claims 1-7, characterized in that, The device comprises: a data acquisition module configured to obtain a plurality of coal rock samples and determine the ash content of the coal rock samples; a T2 cutoff value calculation module configured to perform a saturated water nuclear magnetic resonance test on the coal rock samples to obtain a nuclear magnetic resonance T2 spectrum under a saturated water state, perform centrifugal treatment on the coal rock samples under the saturated water state to obtain a nuclear magnetic resonance T2 spectrum under a bound water state, and obtain a nuclear magnetic resonance T2 cutoff value of the coal rock samples based on the nuclear magnetic resonance T2 spectrum under the saturated water state and the nuclear magnetic resonance T2 spectrum under the bound water state; a model construction module configured to perform an adsorbed gas content test on the coal rock samples to obtain the adsorbed gas content of the coal rock samples, and establish an adsorbed gas content calculation model through regression analysis based on the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content of the coal rock samples; a model construction module configured to perform an adsorbed gas content test on the coal rock samples to obtain the adsorbed gas content of the coal rock samples, and establish an adsorbed gas content calculation model through regression analysis based on the ash content, the nuclear magnetic resonance T2 cutoff value and the adsorbed gas content of the coal rock samples; The prediction module is configured to input the ash content and the nuclear magnetic resonance T2 cutoff value of the coal rock sample to be tested into an adsorbed gas content calculation model to obtain the adsorbed gas content of the coal rock sample to be tested.

9. An electronic device, comprising: The method comprises: A processor, a memory and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for calculating the coal rock gas adsorption amount based on the nuclear magnetic resonance T2 cutoff value according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium and is executable on the processor to implement the method for calculating the coal rock gas adsorption amount based on the nuclear magnetic resonance T2 cutoff value according to any one of claims 1 to 7.

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