A method, device and storage medium for evaluating gas saturation of coal seams

Abstract

The present invention relates to a method, device and storage medium for evaluating gas saturation of coal seams, the method comprising: obtaining electrical spectrum curves of coal samples under different gas saturation conditions; inverting according to the electrical spectrum curves of the coal samples to determine complex resistance parameters; and constructing a model between the complex resistance parameters and gas saturation according to the complex resistance parameters to quantitatively analyze the gas saturation. The present invention calculates and constructs a method for evaluating gas saturation of coal samples using electrical spectrum experimental data under high temperature and high pressure conditions of coal samples, determines the relationship between gas saturation conditions and complex resistance parameters obtained from the electrical spectrum curves of coal samples, and constructs a corresponding model, thereby achieving the purpose of effectively quantitatively analyzing gas saturation.

Description

Technical Field

[0001] The present invention relates to the technical field of exploration and exploitation, and particularly to a method, device and storage medium for evaluating the gas saturation of coal seams. Background Art

[0002] Gas saturation is an important parameter for evaluating the physical properties of coal reservoirs. Accurately evaluating gas saturation has important reference value for aspects such as deeply exploring the effective gas permeability of formations, identifying and distributing gas-water layers, estimating reserves, rock physics simulation and seismic inversion. Currently, in the direction of predicting coal seam gas content, methods such as acoustic, mechanical, and electrical methods are often used for exploration. Since coal seams are usually greatly affected by the environment, common acoustic methods often cannot obtain accurate data. Electrical exploration of coal seams can accurately predict the gas content of coal seams and is not affected by problems such as hole enlargement, and has achieved good results in coal seam exploration.

[0003] Coal is brittle and fragile, and under the influence of a large environment, compared with the compensated density method for predicting the gas content of coal seams, the resistivity method has more advantages. The complex resistivity method can obtain more formation parameters compared with the general resistivity method, and the combined comprehensive interpretation can more accurately evaluate the characteristics of coal reservoirs. Although domestic and foreign scholars have many research results in the direction of rock complex resistivity, the research on evaluating gas saturation using the complex resistivity of coal under high temperature and high pressure conditions still needs to be further studied.

[0004] In summary, there is currently a lack of accurate and effective methods for evaluating the gas saturation of coal seams under high temperature and high pressure conditions. Therefore, how to effectively evaluate gas saturation under complex conditions is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, it is necessary to provide a method, device and storage medium for evaluating the gas saturation of coal seams to overcome the problem in the prior art that it is difficult to efficiently evaluate gas saturation under complex conditions.

[0006] To solve the above technical problems, the present invention provides a method for evaluating the gas saturation of coal seams, including:

[0007] Obtaining the electrical frequency spectrum curves of coal samples under different gas saturation conditions;

[0008] Performing inversion based on the electrical frequency spectrum curves of the coal samples to determine the complex resistance parameters;

[0009] Constructing a model between the complex resistance parameters and the gas saturation based on the complex resistance parameters to quantitatively analyze the gas saturation.

[0010] Further, the obtaining the electrical frequency spectrum curves of coal samples under different gas saturation conditions includes:

[0011] Determine the complex resistivity based on the voltage and current vectors applied to the coal sample;

[0012] Determine the real part and the imaginary part of the complex resistivity according to the complex resistivity;

[0013] Determine the electrical spectrum curve of the coal sample according to the real part of the complex resistivity and the imaginary part of the complex resistivity.

[0014] Further, the complex resistance parameters include the interfacial polarization frequency and the dispersion degree. Inverting according to the electrical spectrum curve of the coal sample to determine the complex resistance parameters includes:

[0015] Invert according to the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters;

[0016] Determine the interfacial polarization frequency and the dispersion degree according to the electrical spectrum parameters.

[0017] Further, the electrical spectrum parameters include the low-frequency complex resistivity, the high-frequency complex resistivity, and the relaxation time. Inverting according to the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters includes:

[0018] Based on the equivalent circuit of the Cole-Cole model, invert according to the electrical spectrum curve of the coal sample, and the corresponding model is expressed by the following formula:

[0019]

[0020] where ρ represents the impedance of the coal sample, ρ 0 represents the zero-frequency resistivity of the coal sample, m represents the polarization rate, ω represents the angular frequency, τ represents the relaxation time, and i represents the imaginary unit;

[0021] Determine the low-frequency complex resistivity, the high-frequency complex resistivity, and the relaxation time according to the inversion result.

[0022] Further, the determining the interfacial polarization frequency and the dispersion degree according to the electrical spectrum parameters includes:

[0023] Determine the reciprocal of the relaxation time of the interfacial polarization of the coal sample in the electrical spectrum parameters as the interfacial polarization frequency, where the interfacial polarization frequency is the frequency point corresponding to the maximum value of the amplitude of the imaginary part of the complex resistivity of the coal sample;

[0024] Determine the dispersion degree according to the low-frequency complex resistivity and the high-frequency complex resistivity in the electrical spectrum parameters, where the dispersion degree is used to characterize the dispersion characteristics of the coal sample.

[0025] Further, the corresponding relationship between the interfacial polarization frequency and the relaxation time is expressed by the following formula:

[0026]

[0027] Among them, τ represents the relaxation time, and FI represents the interface polarization frequency.

[0028] Furthermore, the dispersion degree is represented by the following formula:

[0029]

[0030] Among them, PFE represents the dispersion degree, R α represents the modulus value of the low-frequency complex resistivity, and R β represents the modulus value of the high-frequency complex resistivity.

[0031] Furthermore, the complex resistance parameter includes the interface polarization frequency and the dispersion degree. Based on the complex resistance parameter, a model between the complex resistance parameter and the gas saturation is constructed to quantitatively analyze the gas saturation, including:

[0032] Construct a first linear relationship according to different interface polarization frequencies and their corresponding gas saturations;

[0033] Construct a second linear relationship according to different dispersion degrees and their corresponding gas saturations.

[0034] The present invention also provides a device for evaluating the gas saturation of coal seams, including:

[0035] An acquisition unit for acquiring the electrical spectrum curves of coal samples under different gas saturation conditions;

[0036] A processing unit for performing inversion according to the electrical spectrum curves of the coal samples to determine the complex resistance parameters;

[0037] An analysis unit for constructing a model between the complex resistance parameter and the gas saturation according to the complex resistance parameter to quantitatively analyze the gas saturation.

[0038] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the method for evaluating the gas saturation of coal seams as described above is implemented.

[0039] Compared with the prior art, the beneficial effects of the present invention include: First, effectively obtain the electrical spectrum curves of coal samples under different gas saturation conditions; then, invert the electrical spectrum curves of the coal samples to calculate the corresponding complex resistance parameters; finally, based on the complex resistance parameters, construct a model between the complex resistance parameters and the gas saturation, determine the influence of the complex resistance parameters on the gas saturation, and effectively analyze the gas saturation through the complex resistance parameters. In summary, the present invention proposes a method for calculating and constructing an evaluation method for the gas saturation of coal samples using the electrical spectrum experimental data of coal samples under high temperature and high pressure conditions, determines the relationship between the gas saturation conditions and the complex resistance parameters obtained from the electrical spectrum curves of coal samples, effectively explores the influence of the complex resistance parameters on the gas saturation under different high temperature and high pressure conditions, constructs a corresponding model, and based on this model, the purpose of effectively quantitatively analyzing the gas saturation can be achieved through the complex resistance parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 FIG. is a schematic flowchart of an embodiment of the method for evaluating the gas saturation of coal seams provided by the present invention;

[0041] Figure 2 Provided by the present invention Figure 1 FIG. is a schematic flowchart of an embodiment of step S101 in ;

[0042] Figure 3 Provided by the present invention Figure 1 FIG. is a schematic flowchart of an embodiment of step S102 in ;

[0043] Figure 4 Provided by the present invention Figure 3 FIG. is a schematic flowchart of an embodiment of step S302 in ;

[0044] Figure 5 Provided by the present invention Figure 1 FIG. is a schematic flowchart of an embodiment of step S103 in ;

[0045] Figure 6 FIG. is a schematic structural diagram of an embodiment of the experimental system provided by the present invention;

[0046] Figure 7 FIG. is a schematic curve diagram of an embodiment of the complex resistivity of coal samples at different gas saturations provided by the present invention;

[0047] Figure 8 FIG. is a schematic crossplot diagram of an embodiment of the gas saturation and the interfacial polarization frequency of coal samples provided by the present invention;

[0048] Figure 9 FIG. is a schematic crossplot diagram of an embodiment of the gas saturation and the dispersion degree of coal samples provided by the present invention;

[0049] Figure 10Schematic structural diagram of an embodiment of the coal seam gas saturation evaluation device provided by the present invention;

[0050] Figure 11 Schematic structural diagram of an embodiment of the electronic device provided by the present invention. Detailed implementation manners

[0051] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0052] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the description of the present invention, referring to "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the described embodiments may be combined with other embodiments.

[0054] The present invention provides a coal seam gas saturation evaluation method, device and storage medium, explores the influence of complex resistance parameters on gas saturation under different high temperature and high pressure conditions, constructs an evaluation model of gas saturation, and provides a new idea for further improving the accuracy and efficiency of coal seam gas saturation evaluation under high temperature and high pressure.

[0055] Before describing the embodiments, the following terms are defined:

[0056] Coal seam gas saturation: refers to the degree to which the pores in the coal seam are filled with gas. Usually obtained from the adsorption isotherm curve, that is, the gas saturation is equal to the ratio of the measured gas content to the theoretical gas content corresponding to the original reservoir pressure on the adsorption isotherm curve;

[0057] Cole-Cole model: a model used to describe the dispersion and energy loss in dielectrics, inelastic media and power grids. For homogeneous rock and ore, the change of complex resistivity with frequency (complex resistivity spectrum) caused by the induced polarization effect can be represented by the Cole-Cole model. Among them, due to the existence of the induced polarization effect, there is a phase shift of the potential difference relative to the supply current, so the apparent resistivity is a complex number and changes with the frequency under other unchanged conditions.

[0058] Based on the description of the above technical terms, in the prior art, there is a lack of research on evaluating gas saturation using the complex resistivity of coal under high temperature and high pressure conditions. Therefore, the present invention aims to propose an efficient and accurate method for evaluating coal seam gas saturation under high temperature and high pressure.

[0059] The following will separately elaborate on specific embodiments in detail:

[0060] An embodiment of the present invention provides a method for evaluating coal seam gas saturation, combined with Figure 1 to see, Figure 1 is a schematic flowchart of an embodiment of the method for evaluating coal seam gas saturation provided by the present invention, including steps S101 to step S103, where:

[0061] In step S101, obtain the electrical frequency spectrum curves of coal samples under different gas saturation conditions;

[0062] In step S102, perform inversion based on the electrical frequency spectrum curves of the coal samples to determine the complex resistance parameters;

[0063] In step S103, based on the complex resistance parameters, construct a model between the complex resistance parameters and gas saturation to quantitatively analyze the gas saturation.

[0064] In the embodiment of the present invention, first, effectively obtain the electrical frequency spectrum curves of coal samples under different gas saturation conditions; then, perform inversion on the electrical frequency spectrum curves of the coal samples to calculate the corresponding complex resistance parameters; finally, based on the complex resistance parameters, construct a model between the complex resistance parameters and gas saturation, determine the influence of the complex resistance parameters on gas saturation, and effectively analyze the gas saturation through the complex resistance parameters.

[0065] As a preferred embodiment, combined with Figure 2 to see, Figure 2 is the schematic flowchart of an embodiment of step S101 provided by the present invention. Step S101 includes steps S201 to step S203, where: Figure 1 In step S201, determine the complex resistivity according to the voltage and current vectors applied to the coal sample;

[0066] In step S202, determine the real part of the complex resistivity and the imaginary part of the complex resistivity according to the complex resistivity;

[0067] In step S203, determine the electrical frequency spectrum curve of the coal sample according to the real part of the complex resistivity and the imaginary part of the complex resistivity.

[0068] In step S203, determine the electrical frequency spectrum curve of the coal sample according to the real part of the complex resistivity and the imaginary part of the complex resistivity.

[0069] In an embodiment of the present invention, according to the electrical spectrum experiment of coal samples under high temperature and high pressure conditions, the electrical spectrum curves of coal samples under different gas saturation conditions are measured, which facilitates subsequent calculation of relevant parameters based on the electrical spectrum curves of the coal samples.

[0070] In a specific embodiment of the present invention, the pretreated coal sample is placed in a holder, and a pair of measurement electrodes are symmetrically distributed at both ends of the coal sample and are in full contact with the end faces of the coal sample. By measuring the voltage and current vectors applied to the coal sample and calculating the complex resistivity Z based on this value, the real part R of the complex resistivity and the imaginary part X of the complex resistivity of the coal sample are obtained. When the coal sample is equivalent to a conductor, the complex conductivity is:

[0071] σ * (ω)=iωε * =σ+iωε

[0072] In the above formula, σ is the dielectric conductivity; ε is the dielectric constant characterizing the dielectric polarization characteristics, ω = 2πf is the angular frequency, and i is the imaginary unit. The above formula shows that the conductivity of the medium's conductive characteristics is a complex number and varies with frequency.

[0073] As a preferred embodiment, the above complex resistance parameters include the interfacial polarization frequency and the dispersion degree. Combining Figure 3 to see, Figure 3 provided by the present invention Figure 1 is a schematic flow diagram of an embodiment of step S102. Step S102 includes steps S301 to S302, where:

[0074] In step S301, inversion is performed according to the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters;

[0075] In step S302, according to the electrical spectrum parameters, the interfacial polarization frequency and the dispersion degree are determined.

[0076] In an embodiment of the present invention, based on the electrical spectrum experiment data of coal samples under high temperature and high pressure conditions, parameters such as the low-frequency complex resistivity, high-frequency complex resistivity, and relaxation time of the coal sample are obtained by inversion based on the Cole-Cole model, and then the interfacial polarization frequency and the dispersion degree are calculated.

[0077] As a preferred embodiment, the electrical spectrum parameters include the low-frequency complex resistivity, high-frequency complex resistivity, and relaxation time. The above step S301 specifically includes:

[0078] Based on the equivalent circuit of the Cole-Cole model, inversion is performed according to the electrical spectrum curve of the coal sample, and the corresponding model is represented by the following formula:

[0079]

[0080] Among them, ρ represents the impedance of the coal sample, and ρ 0 represents the zero-frequency resistivity of the coal sample, m represents the polarizability, ω represents the angular frequency, τ represents the relaxation time, and i represents the imaginary unit;

[0081] According to the inversion result, determine the low-frequency complex resistivity, the high-frequency complex resistivity, and the relaxation time.

[0082] In the embodiment of the present invention, effective inversion is performed according to the equivalent circuit of the Cole-Cole model to determine the low-frequency complex resistivity, the high-frequency complex resistivity, and the relaxation time.

[0083] As a preferred embodiment, combined with Figure 4 viewed as Figure 4 provided by the present invention Figure 3 is a schematic flowchart of an embodiment of step S302. Step S302 includes steps S401 to S402, where:

[0084] In step S401, according to the reciprocal of the relaxation time of the interfacial polarization of the coal sample in the electrical spectrum parameters, it is determined as the interfacial polarization frequency. Among them, the interfacial polarization frequency is the frequency point corresponding to the maximum value of the imaginary part amplitude of the complex resistivity of the coal sample;

[0085] In step S402, according to the low-frequency complex resistivity and the high-frequency complex resistivity in the electrical spectrum parameters, determine the dispersion degree, where the dispersion degree is used to characterize the dispersion characteristics of the coal sample.

[0086] In the embodiment of the present invention, the influence of gas saturation on the electrical dispersion of the coal sample is quantitatively evaluated by using the interfacial polarization frequency and the dispersion degree, and a new method for evaluating the gas saturation of the coal sample by using the interfacial polarization frequency and the dispersion degree is constructed.

[0087] As a preferred embodiment, the corresponding relationship between the interfacial polarization frequency and the relaxation time is expressed by the following formula:

[0088]

[0089] Among them, τ represents the relaxation time, and FI represents the interfacial polarization frequency.

[0090] In the embodiment of the present invention, the interfacial polarization frequency is effectively calculated through the above formula.

[0091] It should be noted that as the frequency increases, in the low-frequency band, the amplitude of the imaginary part X of the complex resistivity of the coal sample increases sharply. The frequency point corresponding to the maximum value of the amplitude of the imaginary part X of the complex resistivity of the coal sample is called the interfacial polarization frequency FI, which is often used to evaluate the dispersion characteristics of rocks. Among them, according to the equivalent circuit model, there is a certain relationship between the interfacial polarization frequency of the coal sample and the relaxation time.

[0092] As a preferred embodiment, the above-mentioned dispersion degree is expressed by the following formula:

[0093]

[0094] wherein, PFE represents the dispersion degree, and R α represents the modulus value of the low-frequency complex resistivity, and R β represents the modulus value of the high-frequency complex resistivity.

[0095] In the embodiment of the present invention, the dispersion degree is effectively calculated through the above formula.

[0096] It should be noted that in some cases, there is a double-solution relationship between the real-part dispersion degree of the core and the saturation. Using the real-part dispersion degree to quantitatively evaluate the gas saturation of the core is not universal. Compared with the modulus value and real part of the imaginary part of the complex resistivity, the imaginary part information can better characterize the electrical dispersion characteristics of the coal sample.

[0097] In a specific embodiment of the present invention, R α and R β are respectively taken as 20 Hz and 10 KHz, substituted into the above formula to calculate the dispersion degree PFE, and the dispersion characteristics of the coal sample are characterized by the dispersion degree, and the relationships between the temperature, pressure and gas saturation of the coal sample are quantitatively analyzed. The modulus values of the imaginary parts of the high-frequency complex resistivity and the low-frequency complex resistivity obtained by inversion are substituted into the above formula for calculation.

[0098] As a preferred embodiment, the complex resistance parameters include the interfacial polarization frequency and the dispersion degree. Combining Figure 5 to see, Figure 5 is a schematic flow chart of an embodiment of step S103 provided by the present invention, including steps S501 to S502, wherein: Figure 1 In step S501, a first linear relationship is constructed according to different interfacial polarization frequencies and their corresponding gas saturations;

[0099] In step S501, a first linear relationship is constructed according to different interfacial polarization frequencies and their corresponding gas saturations;

[0100] In step S502, a first linear relationship is constructed according to different interfacial polarization frequencies and their corresponding gas saturations.

[0101] In the embodiment of the present invention, a first linear relationship is established by using the good linear relationship between the interfacial polarization frequency and the gas saturation, and a second linear relationship is established by using the good linear relationship between the dispersion degree and the gas saturation.

[0102] Next, combining Figures 6 to 9 to see, Figure 6 is a schematic structural diagram of an embodiment of the experimental system provided by the present invention, Figure 7 is a schematic curve diagram of an embodiment of the complex resistivity of the coal sample at different gas saturations provided by the present invention, Figure 8Crossing diagram of an embodiment of gas saturation and interfacial polarization frequency of coal samples provided by the present invention Figure 9 Crossing diagram of an embodiment of gas saturation and dispersion degree of coal samples provided by the present invention. The main content of the present invention is illustrated by a specific application example:

[0103] As Figure 6 shown, the experimental system consists of a high-precision impedance analyzer, a displacement pump, a core holder, a saturation measurement device, a confining pressure pump, and a computer (impedance analyzer program control system). The experiment uses the impedance analyzer to measure the complex resistivity of the coal sample in the range of 20 Hz - 10 MHz, scans 101 points according to logarithmic equal intervals, and the instrument accuracy can reach 0.8%. The method for changing the gas saturation of the coal sample selects gas (N2) to displace water. The high-temperature and high-pressure electrical spectrum instrument is set at room temperature (27°C) and constant pressure of 3 MPa, and the displacement pump pressure is set at 0.1 MPa. As the gas saturation in the coal sample increases, the displacement pressure is sequentially set to 0.2 MPa, 0.4 MPa, 0.6 MPa, 0.8 MPa, 1 MPa, and 1.2 MPa, and the complex resistivity of the coal sample at different gas saturations is recorded. As Figure 7 shown, Sg represents the gas saturation of the coal sample;

[0104] As Figure 8 shown, as the gas saturation of the coal sample continuously increases, the interfacial polarization frequency continuously increases and shows a good linear relationship;

[0105] As Figure 9 shown, as the gas saturation increases, the dispersion degree of the coal sample continuously increases and shows a good linear relationship. It can be seen that using the dispersion degree of the imaginary part of the complex resistivity to evaluate the temperature, pressure, and gas saturation of the coal sample has obvious effects, which is also a corroboration of the effectiveness of the method of the present invention.

[0106] It should be noted that based on the electrical spectrum experiment of coal samples under high-temperature and high-pressure conditions, the present invention discovers that there is a dispersion phenomenon in the complex resistivity of coal samples, which is affected by the gas saturation. The present invention quantitatively evaluates the influence of gas saturation on the electrical dispersion of coal samples by using the interfacial polarization frequency and dispersion degree. The results show that the interfacial polarization frequency has a good linear relationship with the gas saturation, and the dispersion degree also has a good linear relationship with the gas saturation.

[0107] The embodiment of the present invention also provides a device for evaluating the gas saturation of coal seams. Combining Figure 10 to see, Figure 10 is the structural diagram of an embodiment of the device for evaluating the gas saturation of coal seams provided by the present invention. The device for evaluating the gas saturation of coal seams 1000 includes:

[0108] An acquisition unit 1001, configured to acquire main control factors;

[0109] A processing unit 1002 is configured to determine a classification category according to the main control factor; and is configured to construct a dessert evaluation model according to the main control factor and the classification category based on a random forest, and determine a dessert evaluation factor.

[0110] An analysis unit 1003 is configured to determine a favorable exploration area of shale gas according to the dessert evaluation factor.

[0111] For a more specific implementation manner of each unit of the coal seam gas saturation evaluation device, reference may be made to the description of the above coal seam gas saturation evaluation method, and it has a similar beneficial effect, which will not be elaborated here.

[0112] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the above-mentioned coal seam gas saturation evaluation method is implemented.

[0113] Generally speaking, computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. A non-transitory computer-readable storage medium may include any computer-readable medium except for a signal propagating temporarily itself.

[0114] A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0115] The computer program code for performing the operations of the present invention can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. In particular, the Python language suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. can be used. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, by connecting through the Internet service provider via the Internet).

[0116] An embodiment of the present invention also provides an electronic device. Considering Figure 11 it Figure 11 is a schematic structural diagram of an embodiment of the electronic device provided by the present invention. The electronic device 1100 includes a processor 1101, a memory 1102, and a computer program stored in the memory 1102 and executable on the processor 1101. When the processor 1101 executes the program, the coal seam gas saturation evaluation method described above is implemented.

[0117] As a preferred embodiment, the above-mentioned electronic device 1100 further includes a display 1103 for displaying the processor 1101 executing the coal seam gas saturation evaluation method described above.

[0118] Exemplarily, the computer program can be divided into one or more modules / units. One or more modules / units are stored in the memory 1102 and executed by the processor 1101 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the electronic device 1100. For example, the computer program can be divided into the acquisition unit 1001, the processing unit 1002, and the analysis unit 1003 in the above embodiment. The specific functions of each unit are as described above and will not be elaborated here one by one.

[0119] The electronic device 1100 can be a desktop computer, notebook, palm computer, or smart phone with an adjustable camera module, etc.

[0120] Among them, the processor 1101 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 1101 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0121] Among them, the memory 1102 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electric Erasable Programmable Read-Only Memory (EEPROM), etc. Among them, the memory 1102 is used to store programs. After receiving the execution instruction, the processor 1101 executes the program. The method defined by the process disclosed in any embodiment of the foregoing embodiments of the present invention can be applied to the processor 1101 or implemented by the processor 1101.

[0122] Among them, the display 1103 may be an LCD display screen or an LED display screen. For example, the display screen on a mobile phone.

[0123] It can be understood that Figure 11 The structure shown is only a schematic diagram of one structure of the electronic device 1100, and the electronic device 1100 may also include more or fewer components than Figure 11 shown. Figure 11 The components shown in can be implemented using hardware, software, or a combination thereof.

[0124] The computer-readable storage medium and the electronic device provided according to the above embodiments of the present invention can be implemented with reference to the content specifically described in the coal seam gas saturation evaluation method implemented according to the present invention, and have beneficial effects similar to those of the coal seam gas saturation evaluation method described above, which will not be elaborated here.

[0125] The present invention discloses a method, device and storage medium for evaluating the gas saturation of a coal seam. First, the electrical spectrum curves of coal samples under different gas saturation conditions are effectively obtained; then, the electrical spectrum curves of the coal samples are inverted to calculate the corresponding complex resistance parameters; finally, based on the complex resistance parameters, a model between the complex resistance parameters and the gas saturation is constructed to determine the influence of the complex resistance parameters on the gas saturation, and the gas saturation can be effectively analyzed through the complex resistance parameters.

[0126] The technical solution of the present invention proposes a method for calculating and constructing an evaluation method for the gas saturation of coal samples using the electrical spectrum experimental data of coal samples under high temperature and high pressure conditions, determines the relationship between the gas saturation conditions and the complex resistance parameters obtained from the electrical spectrum curves of coal samples, effectively explores the influence of the complex resistance parameters on the gas saturation under different high temperature and high pressure conditions, constructs a corresponding model, and based on this model, the purpose of effectively quantitatively analyzing the gas saturation can be achieved through the complex resistance parameters.

[0127] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for evaluating coal seam gas saturation, characterized in that: include: Obtain electrical spectrum curves of coal samples under different gas saturation conditions; Inverting the electrical spectrum curve of the coal sample to determine the complex resistance parameters; According to the complex resistance parameter, a model between the complex resistance parameter and gas saturation is constructed to quantitatively analyze the gas saturation; The complex resistance parameters include interface polarization frequency and dispersion. The inversion is performed according to the electrical spectrum curve of the coal sample to determine the complex resistance parameters, including: Inverting the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters; Determining the interface polarization frequency and the frequency dispersion according to the electrical spectrum parameters; The electrical spectrum parameters include low-frequency complex resistivity, high-frequency complex resistivity and relaxation time. The inversion is performed according to the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters, including: Based on the Cole-Cole model equivalent circuit, the inversion is performed according to the electrical spectrum curve of the coal sample, and the corresponding model is expressed by the following formula: in, represents the impedance of the coal sample, Indicates the zero-frequency resistivity of the coal sample, represents the polarizability, represents the angular frequency, represents the relaxation time, i represents the imaginary unit; According to the inversion result, the low-frequency complex resistivity, the high-frequency complex resistivity and the relaxation time are determined.

2. The method for evaluating coal seam gas saturation according to claim 1, characterized in that: The method of obtaining electrical spectrum curves of coal samples under different gas saturation conditions includes: Determine the complex resistivity based on the voltage and current vectors applied to the coal sample; According to the complex resistivity, determining a real part of the complex resistivity and an imaginary part of the complex resistivity; The electrical spectrum curve of the coal sample is determined according to the real part of the complex resistivity and the imaginary part of the complex resistivity.

3. The method for evaluating coal seam gas saturation according to claim 1, characterized in that: The determining the interface polarization frequency and the dispersion according to the electrical spectrum parameters comprises: According to the reciprocal of the relaxation time of the interface polarization of the coal sample in the electrical spectrum parameter, the interface polarization frequency is determined, wherein the interface polarization frequency is the frequency point corresponding to the maximum amplitude of the imaginary part of the complex resistivity of the coal sample; The dispersion is determined according to the low-frequency complex resistivity and the high-frequency complex resistivity in the electrical spectrum parameters, wherein the dispersion is used to characterize the dispersion characteristics of the coal sample.

4. The method for evaluating coal seam gas saturation according to claim 3, characterized in that: The corresponding relationship between the interface polarization frequency and the relaxation time is expressed by the following formula: in, represents the relaxation time, and FI represents the interface polarization frequency.

5. The method for evaluating coal seam gas saturation according to claim 3, characterized in that: The frequency dispersion is expressed by the following formula: in, represents the frequency dispersion, represents the modulus of the low-frequency complex resistivity, represents the modulus of the high frequency complex resistivity.

6. The method for evaluating coal seam gas saturation according to claim 1, characterized in that: The complex resistance parameters include interface polarization frequency and dispersion. According to the complex resistance parameters, a model between the complex resistance parameters and gas saturation is constructed to quantitatively analyze the gas saturation, including: According to different interface polarization frequencies and their corresponding gas saturations, a first linear relationship is constructed; According to different dispersions and their corresponding gas saturations, a second linear relationship is constructed.

7. A coal seam gas saturation evaluation device, characterized in that: include: An acquisition unit, used for acquiring electrical spectrum curves of coal samples under different gas saturation conditions; A processing unit, used for inverting the electrical spectrum curve of the coal sample to determine the complex resistance parameters; an analysis unit, configured to construct a model between the complex resistance parameter and gas saturation according to the complex resistance parameter, so as to quantitatively analyze the gas saturation; The complex resistance parameters include interface polarization frequency and dispersion. The inversion is performed according to the electrical spectrum curve of the coal sample to determine the complex resistance parameters, including: Inverting the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters; Determining the interface polarization frequency and the frequency dispersion according to the electrical spectrum parameters; The electrical spectrum parameters include low-frequency complex resistivity, high-frequency complex resistivity and relaxation time. The inversion is performed according to the electrical spectrum curve of the coal sample to determine the electrical spectrum parameters, including: Based on the Cole-Cole model equivalent circuit, the inversion is performed according to the electrical spectrum curve of the coal sample, and the corresponding model is expressed by the following formula: in, represents the impedance of the coal sample, Indicates the zero-frequency resistivity of the coal sample, represents the polarizability, represents the angular frequency, represents the relaxation time, i represents the imaginary unit; According to the inversion result, the low-frequency complex resistivity, the high-frequency complex resistivity and the relaxation time are determined.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the coal seam gas saturation evaluation method according to any one of claims 1 to 6 is implemented.

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