A method and system for analyzing water-richness of underlying rock formations in coal seams

Abstract

The present invention provides a method and system for analyzing the water-richness of the rock formations beneath coal seams. The method comprises using a three-dimensional seismic ant attribute analysis technique to analyze faults, collapse columns, and fissures of the rock formations beneath coal seams to obtain a first attribute analysis diagram; using a three-dimensional seismic waveform difference analysis technique to analyze the rock integrity of the rock formations beneath coal seams to obtain a second attribute analysis diagram; using a three-dimensional seismic inversion technique to analyze the rock physical parameters of the rock formations beneath coal seams to obtain a three-dimensional data body of the rock physical parameters of the rock formations beneath coal seams; performing multi-information fusion and cross-validation on the obtained analysis results to comprehensively analyze the water-richness of the rock formations beneath coal seams from multiple aspects. The application of the present invention can solve the deficiencies of the prior art, and can comprehensively consider the key factors related to the water-richness of the rock formations beneath coal seams for analysis, thereby improving the accuracy of the water-richness analysis of the rock formations beneath coal seams.

Description

Technical Field

[0001] The present invention relates to the technical field of mining exploration, and in particular to a method for analyzing the water-richness of rock strata underlying a coal seam and an analysis system using the method. Background Art

[0002] Water contained in sandstone fissure-type aquifers is a common water hazard in most coalfields in my country. This water, mostly static, typically flows in and out quickly, posing a relatively minor threat. Consequently, it has received insufficient attention, and research on the issue has been limited. However, in recent years, there have been increasing instances of large, long-lasting water inflows from these aquifers. Preemptive measures to drain the sandstone water from the roof and floor of coal seams could significantly mitigate the water hazards associated with these aquifers.

[0003] At present, in the analysis of water-richness of underlying rock strata in coalfields, electromagnetic methods, three-dimensional seismic attribute analysis, inversion and other geophysical methods are mainly used for pre-mining exploration.

[0004] Therefore, the existing technology has problems and shortcomings: the general water-richness analysis method of the underlying rock strata of coal seams is relatively simple, lacks comprehensive analysis and cross-validation from multiple aspects, and the accuracy needs to be improved. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a method and system for analyzing the water richness of the underlying rock strata of coal seams. This method and system can solve the problems existing in the existing technology such as the single water richness analysis method, lack of comprehensive analysis and cross-validation, and low accuracy. It can comprehensively consider the key factors related to the water richness of the underlying rock strata of coal seams for analysis, thereby improving the accuracy of the water richness analysis of the underlying rock strata of coal seams.

[0006] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0007] A method for analyzing the water-richness of the underlying rock strata of a coal seam comprises the following steps: using a three-dimensional seismic ant attribute analysis technique to analyze faults, collapse columns, and cracks in the underlying rock strata of the coal seam to obtain a first attribute analysis diagram; using a three-dimensional seismic waveform difference analysis technique to analyze the rock integrity of the underlying rock strata of the coal seam to obtain a second attribute analysis diagram; using a three-dimensional seismic inversion technique to analyze the rock physical parameters of the underlying rock strata of the coal seam to obtain a three-dimensional data volume of the rock physical parameters of the underlying rock strata of the coal seam; and performing multi-information fusion and cross-validation on the analysis results obtained in the above steps to comprehensively analyze the water-richness of the underlying rock strata of the coal seam from multiple aspects.

[0008] A further solution is to first obtain three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data in the study area before obtaining relevant attribute data of the underlying rock strata of the coal seam.

[0009] A further solution is to analyze the data obtained through the three-dimensional seismic ant attribute analysis technology, including: based on the three-dimensional seismic data body and stratigraphic interpretation data, using the three-dimensional seismic ant attribute analysis technology to analyze the faults, sinkholes, cracks, etc. of the underlying rock formations of the coal seam, obtain a first attribute analysis map, and delineate the fault-crack development zone.

[0010] A further solution is to use the three-dimensional seismic waveform difference analysis technology to analyze the rock integrity of the underlying rock layer of the coal seam, including: based on the three-dimensional seismic data body and stratigraphic interpretation data, using the three-dimensional seismic waveform difference analysis technology to analyze the rock integrity of the underlying rock layer of the coal seam, setting the seismic waveform difference analysis result to x1, where the higher the x1 value, the more broken the rock, and the lower the x1 value, the more complete the rock.

[0011] A further solution is to use three-dimensional seismic inversion technology to analyze the rock physical parameters of the underlying rock layer of the coal seam, including: based on three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data, using three-dimensional seismic inversion technology to analyze and obtain three-dimensional data bodies of rock physical parameters such as resistivity, density, porosity, etc. of the underlying rock layer of the coal seam, and setting the resistivity inversion analysis result to x2, the density inversion analysis result to x3, and the porosity inversion analysis result to x4.

[0012] A further solution is to perform multi-information fusion and cross-validation on the obtained analysis results, and conduct a comprehensive analysis of the water-richness of the underlying rock formations of the coal seam from multiple aspects, including: performing multi-information fusion on the obtained analysis results, superimposing the high-value area of ​​the fused analysis results with the delineated fault-fracture development area, and determining the overlapping area as the area with stronger water-richness.

[0013] A further approach is to normalize the obtained analysis results, set the normalized results of x1, x2, x3, and x4 to y1, y2, y3, and y4, and then use PCA principal component analysis to determine the weight coefficients a1, a2, a3, and a4 of y1, y2, y3, and y4. Therefore, the fusion analysis result z is expressed as formula (1):

[0014] z=|a1|*y1-|a2|*y2-|a3|*y3+|a4|*y4 (1)

[0015] Among them, the larger the z value of the fusion analysis result, the stronger the water-richness. The area with large z value overlaps with the delineated fault-fissure development area, and the overlapping area is determined to be an area with strong water-richness.

[0016] It can be seen that compared with the existing technology, the present invention is suitable for analyzing the water-richness of the underlying rock strata in coalfields, and uses data processing to analyze the water-rich geological characteristics of the underlying rock strata from multiple angles. It adopts multiple geophysical methods such as ant tracking, attribute analysis, and multi-attribute inversion. By comprehensively considering the development of faults and fissures in the underlying rock strata of the coal seam, rock integrity analysis, resistivity analysis, density analysis, porosity distribution and other five aspects, cross-validation of the research results of multiple methods can effectively improve the accuracy of the water-richness analysis of the underlying rock strata of the coal seam.

[0017] A system for analyzing the water-richness of underlying strata of a coal seam is provided. The system is applied to the above-mentioned method for analyzing the water-richness of underlying strata of a coal seam. The system comprises: a first analysis unit for analyzing faults, collapse columns, and fractures in the underlying strata of the coal seam using a three-dimensional seismic ant attribute analysis technique to obtain a first attribute analysis diagram;

[0018] The second analysis unit is used to analyze the rock integrity of the underlying rock layer of the coal seam using a three-dimensional seismic waveform difference analysis technology to obtain a second attribute analysis diagram;

[0019] The third analysis unit is used to analyze the rock physical parameters of the rock layer underlying the coal seam using the three-dimensional seismic inversion technology to obtain a three-dimensional data volume of the rock physical parameters of the rock layer underlying the coal seam;

[0020] The analysis result unit is used to perform multi-information fusion and cross-verification on the analysis results obtained in the above steps, and conduct a comprehensive analysis of the water-richness of the underlying rock formations of the coal seam from multiple aspects.

[0021] It can be seen that the present invention completes the specified analysis target through an analysis system composed of a first analysis unit, a second analysis unit, a third analysis unit and an analysis result unit, and comprehensively considers the water-richness analysis of the underlying rock strata of the coal seam from five aspects, including the development of fault fractures, rock integrity analysis, resistivity analysis, density analysis, and porosity analysis, thereby improving the accuracy of the water-richness analysis of the underlying rock strata of the coal seam.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of an embodiment of a method for analyzing the water-richness of underlying rock formations of a coal seam according to the present invention.

[0024] Figure 2 This is an attribute analysis diagram of the statistical distribution results of cracks within 30ms of the coal seam floor in the study area in an embodiment of a method for analyzing the water richness of the underlying rock layer of a coal seam in the present invention.

[0025] Figure 3 This is an attribute analysis diagram of the rock integrity distribution results within 30ms of the coal seam floor in the study area in an embodiment of a method for analyzing the water richness of the underlying rock layer of a coal seam in the present invention.

[0026] Figure 4 This is an inversion result diagram of the resistivity of the underlying rock strata of the coal seam within 30ms of the coal seam bottom plate in the study area in an embodiment of a method for analyzing the water richness of the underlying rock strata of the coal seam of the present invention.

[0027] Figure 5 This is an inversion result diagram of the rock density of the underlying rock strata of the coal seam within 30ms of the coal seam bottom plate in the study area in an embodiment of the method for analyzing the water richness of the underlying rock strata of the coal seam of the present invention.

[0028] Figure 6 This is an inversion result diagram of the rock porosity of the underlying rock strata of the coal seam within 30ms of the coal seam bottom plate in the study area in an embodiment of a method for analyzing the water richness of the underlying rock strata of the coal seam of the present invention.

[0029] Figure 7 This is a diagram of the prediction results of the water-richness analysis within 30ms of the coal seam floor in the study area in an embodiment of a method for analyzing the water-richness of underlying rock formations of a coal seam according to the present invention.

[0030] Figure 8 It is a schematic diagram of an embodiment of a system for analyzing the water-richness of underlying rock formations of a coal seam according to the present invention. DETAILED DESCRIPTION

[0031] An example of a method for analyzing the water-richness of the underlying rock formation of a coal seam:

[0032] like Figure 1 As shown, a method for analyzing the water-richness of the underlying rock formation of a coal seam comprises the following steps:

[0033] Step S1: Analyze the faults, collapse columns, and cracks of the underlying rock strata of the coal seam using the 3D seismic ant attribute analysis technology to obtain a first attribute analysis diagram.

[0034] Step S2: Analyze the rock integrity of the underlying rock layer of the coal seam using a three-dimensional seismic waveform difference analysis technique to obtain a second attribute analysis diagram.

[0035] Step S3: Analyze the rock physical parameters of the underlying rock layer of the coal seam using the three-dimensional seismic inversion technology to obtain a three-dimensional data volume of the rock physical parameters of the underlying rock layer of the coal seam.

[0036] In step S4, the analysis results obtained in the above steps are subjected to multi-information fusion and cross-validation, and a comprehensive analysis of the water-richness of the underlying rock formations of the coal seam is conducted from multiple aspects.

[0037] Before obtaining the relevant attribute data of the underlying rock strata of the coal seam, first, obtain the three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data in the study area.

[0038] In the above step S1, the acquired data is analyzed by the three-dimensional seismic ant attribute analysis technology, including: based on the three-dimensional seismic data volume and the stratigraphic interpretation data, the three-dimensional seismic ant attribute analysis technology is used to analyze the faults, collapse columns, cracks and other conditions of the underlying rock formations of the coal seam, obtain a first attribute analysis diagram, and delineate the fault-crack development zone.

[0039] In the above step S2, the rock integrity of the underlying rock layer of the coal seam is analyzed using the three-dimensional seismic waveform difference analysis technology, including: based on the three-dimensional seismic data body and the stratigraphic interpretation data, the rock integrity of the underlying rock layer of the coal seam is analyzed using the three-dimensional seismic waveform difference analysis technology, and the seismic waveform difference analysis result is set to x1, wherein the higher the x1 value, the more broken the rock, and the lower the x1 value, the more complete the rock.

[0040] In the above step S3, the rock physical parameters of the underlying rock strata of the coal seam are analyzed using three-dimensional seismic inversion technology, including: based on three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data, the three-dimensional seismic inversion technology is used to analyze and obtain a three-dimensional data body of rock physical parameters such as resistivity, density, porosity, etc. of the underlying rock strata of the coal seam, and the resistivity inversion analysis result is set as x2, the density inversion analysis result is set as x3, and the porosity inversion analysis result is set as x4.

[0041] In the above step S4, the analysis results obtained in steps S2 and S3 are subjected to multi-information fusion and cross-validation, and the water-richness of the underlying rock strata of the coal seam is comprehensively analyzed from multiple aspects, including: multi-information fusion of the obtained analysis results, superposition of the large-value area of ​​the obtained fused analysis results with the delineated fault-fracture development area, and the overlapping area is determined as the area with strong water-richness.

[0042] Specifically, the obtained analysis results are normalized, and the normalized results of x1, x2, x3, and x4 are set to y1, y2, y3, and y4. Then, the weight coefficients a1, a2, a3, and a4 of y1, y2, y3, and y4 are determined by PCA principal component analysis. Therefore, the fusion analysis result z is expressed as formula (1):

[0043] z=|a1|*y1-|a2|*y2-|a3|*y3+|a4|*y4 (1)

[0044] Among them, the larger the z value of the fusion analysis result, the stronger the water-richness. The area with large z value overlaps with the delineated fault-fissure development area, and the overlapping area is determined to be an area with strong water-richness.

[0045] In this embodiment, generally speaking, the rock combination with weaker water-richness has the characteristics of high density, high resistivity, low porosity, complete rock, and undeveloped cracks, while the rock combination with stronger water-richness has the characteristics of low density, low resistivity, high porosity, broken rock, and developed cracks.

[0046] Therefore, the present invention provides a method for analyzing the water-richness of the underlying rock strata of the coal seam to analyze five aspects of information, including the development of faults and fissures in the underlying rock strata of the coal seam, rock integrity analysis, resistivity analysis, density analysis, and porosity distribution, and performs fusion analysis and cross-validation to improve the accuracy of the water-richness analysis of the underlying rock strata of the coal seam.

[0047] In order to make the technical means, features and effects of the patent of this invention easier to understand, the present invention is further explained below in combination with specific implementation methods, taking an actual mining area as an example.

[0048] 1. First, prepare the three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data of the study area.

[0049] 2. Based on the 3D seismic data and horizon interpretation data, the faults, collapse columns, and cracks in the underlying rock layer of the coal seam (in this case, 30ms below the coal seam) are analyzed using ant attribute analysis technology to obtain attribute analysis diagrams and delineate fault-crack development areas, such as Figure 2 shown.

[0050] 3. Based on the 3D seismic data and horizon interpretation data, the rock integrity of the underlying rock layer (in this case, 30ms below the coal seam) is analyzed using waveform difference analysis technology to obtain the attribute analysis diagram as shown below: Figure 3 shown.

[0051] 4. Based on 3D seismic data, layer data, interpretation data, logging data, drilling data, etc., 3D seismic inversion technology is used to obtain 3D data of rock physical parameters such as resistivity, density, porosity, etc. of the underlying rock layer of the coal seam (such as Figure 4 、 Figure 5 、 Figure 6 shown).

[0052] 5. Generally speaking, rock combinations with weak water-rich properties are characterized by high density, high P-wave velocity, high resistivity, low porosity, complete rocks, and undeveloped cracks, while rock combinations with strong water-rich properties are characterized by low density, low P-wave velocity, low resistivity, high porosity, broken rocks, and developed cracks. Based on these characteristics, the analysis results in steps 3 and 4 are fused with multiple information. The high-value area of ​​the fusion analysis results is overlapped with the fault-crack development area delineated in step 2. The overlapping area is determined as the area with strong water-rich properties, such as Figure 6 shown.

[0053] Therefore, through steps 1 to 5, the water-richness of the underlying rock strata of the coal seam can be predicted and analyzed quickly and accurately.

[0054] Specifically, the analysis results from steps 1-4 are subjected to multi-information fusion and cross-validation to comprehensively analyze the water-richness of the underlying strata of the coal seam from multiple perspectives. The specific operation is: the analysis results from steps 3-4 are normalized, and the normalized results of x1, x2, x3, and x4 are set to y1, y2, y3, and y4. Then, PCA principal component analysis is used to determine the weight coefficients a1, a2, a3, and a4 of y1, y2, y3, and y4.

[0055] Because rock combinations with strong water-rich properties are characterized by developed fractures, broken rocks, low resistivity, low density, and high porosity, the fusion analysis result, z, is expressed as z = |a1|*y1 - |a2|*y2 - |a3|*y3 + |a4|*y4. The larger the z value in the fusion analysis, the stronger the water-rich properties. The areas with high z values ​​are superimposed on the fault-fracture development areas identified in step 1. The overlapping areas are identified as areas with strong water-rich properties.

[0056] It can be seen that compared with the existing technology, the present invention is suitable for analyzing the water-richness of the underlying rock strata in coalfields, and uses data processing to analyze the water-rich geological characteristics of the underlying rock strata from multiple angles. It adopts multiple geophysical methods such as ant tracking, attribute analysis, and multi-attribute inversion. By comprehensively considering the development of faults and fissures in the underlying rock strata of the coal seam, rock integrity analysis, resistivity analysis, density analysis, porosity distribution and other five aspects, cross-validation of the research results of multiple methods can effectively improve the accuracy of the water-richness analysis of the underlying rock strata of the coal seam.

[0057] An embodiment of a system for analyzing water richness of underlying rock formations of a coal seam:

[0058] A system for analyzing water richness of underlying strata of coal seams, which is applied to the above-mentioned method for analyzing water richness of underlying strata of coal seams for management and deployment, such as Figure 8 As shown, the system includes:

[0059] The first analysis unit is used to analyze the faults, collapse columns and cracks of the rock layer underlying the coal seam by using the three-dimensional seismic ant attribute analysis technology to obtain a first attribute analysis diagram.

[0060] The second analysis unit is used to analyze the rock integrity of the underlying rock layer of the coal seam using a three-dimensional seismic waveform difference analysis technology to obtain a second attribute analysis diagram.

[0061] The third analysis unit is used to analyze the rock physical parameters of the rock strata underlying the coal seam using the three-dimensional seismic inversion technology to obtain a three-dimensional data body of the rock physical parameters of the rock strata underlying the coal seam.

[0062] The analysis result unit is used to perform multi-information fusion and cross-verification on the analysis results obtained in the above steps, and conduct a comprehensive analysis of the water-richness of the underlying rock formations of the coal seam from multiple aspects.

[0063] Before obtaining the relevant attribute data of the underlying rock strata of the coal seam, first, obtain the three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data in the study area.

[0064] Based on 3D seismic data and stratigraphic interpretation data, the 3D seismic ant attribute analysis technology was used to analyze the faults, collapse columns, cracks and other conditions of the underlying rock strata of the coal seam, obtain the first attribute analysis map, and delineate the fault-crack development zone.

[0065] In the first analysis unit, the acquired data is analyzed using 3D seismic ant attribute analysis technology, including: based on the 3D seismic data volume and stratigraphic interpretation data, the 3D seismic ant attribute analysis technology is used to analyze the faults, collapse columns, cracks, etc. of the underlying rock formations of the coal seam, obtain the first attribute analysis map, and delineate the fault-crack development zone.

[0066] In the second analysis unit, the rock integrity of the underlying rock layer of the coal seam is analyzed using three-dimensional seismic waveform difference analysis technology, including: based on the three-dimensional seismic data body and stratigraphic interpretation data, the rock integrity of the underlying rock layer of the coal seam is analyzed using three-dimensional seismic waveform difference analysis technology, and the seismic waveform difference analysis result is set to x1, where the higher the x1 value, the more broken the rock, and the lower the x1 value, the more complete the rock.

[0067] In the third analysis unit, the three-dimensional seismic inversion technology is used to analyze the rock physical parameters of the underlying rock layer of the coal seam, including: based on three-dimensional seismic data, stratigraphic data, interpretation data, logging data, drilling data and other data, the three-dimensional seismic inversion technology is used to analyze and obtain the three-dimensional data body of the rock physical parameters such as resistivity, density, porosity, etc. of the underlying rock layer of the coal seam, and the resistivity inversion analysis result is set as x2, the density inversion analysis result is set as x3, and the porosity inversion analysis result is set as x4.

[0068] In the analysis result unit, the analysis results obtained from the second analysis unit and the third analysis unit are subjected to multi-information fusion and cross-verification, and the water-richness of the underlying rock strata of the coal seam is comprehensively analyzed from multiple aspects, including: multi-information fusion of the obtained analysis results, superposition of the large-value area of ​​the fused analysis results with the delineated fault-fracture development area, and the overlapping area is determined as the area with strong water-richness.

[0069] Specifically, the obtained analysis results are normalized, and the normalized results of x1, x2, x3, and x4 are set to y1, y2, y3, and y4. Then, the weight coefficients a1, a2, a3, and a4 of y1, y2, y3, and y4 are determined by PCA principal component analysis. Therefore, the fusion analysis result z is expressed as formula (1):

[0070] z=|a1|*y1-|a2|*y2-|a3|*y3+|a4|*y4 (1)

[0071] Among them, the larger the z value of the fusion analysis result, the stronger the water-richness. The area with large z value overlaps with the delineated fault-fissure development area, and the overlapping area is determined to be an area with strong water-richness.

[0072] It can be seen that the present invention completes the specified analysis target through an analysis system composed of a first analysis unit, a second analysis unit, a third analysis unit and an analysis result unit, and comprehensively considers the water-richness analysis of the underlying rock strata of the coal seam from five aspects, including the development of fault fractures, rock integrity analysis, resistivity analysis, density analysis, and porosity analysis, thereby improving the accuracy of the water-richness analysis of the underlying rock strata of the coal seam.

[0073] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A method for analyzing the water richness of the underlying rock formation of a coal seam, characterized in that: The following steps are involved: Obtain 3D seismic data, stratigraphic data, interpretation data, logging data, and drilling data in the study area; The faults, collapse columns and cracks of the rock formations underlying the coal seams are analyzed by using the 3D seismic ant attribute analysis technology to obtain the first attribute analysis diagram, including: based on the 3D seismic data volume and the stratigraphic interpretation data, the faults, collapse columns and cracks of the rock formations underlying the coal seams are analyzed by using the 3D seismic ant attribute analysis technology to obtain the first attribute analysis diagram, and the fault-crack development area is delineated; The rock integrity of the underlying rock layer of the coal seam is analyzed by using the three-dimensional seismic waveform difference analysis technology to obtain the second attribute analysis diagram, including: based on the three-dimensional seismic data body and the stratigraphic interpretation data, the rock integrity of the underlying rock layer of the coal seam is analyzed by using the three-dimensional seismic waveform difference analysis technology, and the seismic waveform difference analysis result is set as x1, wherein the higher the x1 value, the more broken the rock is, and the lower the x1 value, the more complete the rock is; The rock physical parameters of the underlying rock formation of the coal seam are analyzed by using the three-dimensional seismic inversion technology to obtain the three-dimensional data body of the rock physical parameters of the underlying rock formation of the coal seam, including: based on the three-dimensional seismic data, stratigraphic data, interpretation data, logging data, and drilling data, the three-dimensional data body of the rock physical parameters of the resistivity, density, and porosity of the underlying rock formation of the coal seam is obtained by using the three-dimensional seismic inversion technology to analyze, and the resistivity inversion analysis result is set as x2, the density inversion analysis result is set as x3, and the porosity inversion analysis result is set as x4; The analysis results obtained in the above steps are subjected to multi-information fusion and cross-validation, and a comprehensive analysis of the water-richness of the underlying rock formations of the coal seam is conducted from multiple aspects.

2. The method according to claim 1, characterized in that The obtained analysis results are subjected to multi-information fusion and cross-validation, and the water-richness of the underlying rock formations of the coal seam is comprehensively analyzed from multiple aspects, including: The obtained analysis results are fused with multiple information, and the large value area of ​​the fused analysis results is superimposed with the delineated fault-crack development area, and the overlapping area is determined as the area with strong water richness.

3. The method according to claim 2, characterized in that: Normalize the obtained analysis results, set the normalized results of x1, x2, x3, x4 to y1, y2, y3, y4, and then use PCA principal component analysis to determine the weight coefficients a1, a2, a3, a4 of y1, y2, y3, y4. Therefore, the fusion analysis result z is expressed as formula (1): z=|a1|*y1-|a2|*y2-|a3|*y3+|a4|*y4 (1) Among them, the larger the z value of the fusion analysis result, the stronger the water-richness. The area with large z value overlaps with the delineated fault-crack development area, and the overlapping area is determined to be an area with strong water-richness.

4. A system for analyzing water richness of underlying rock formations of coal seams, characterized in that: include: The first analysis unit is used to analyze the faults, collapse columns and cracks of the rock formations underlying the coal seam by using the 3D seismic ant attribute analysis technology to obtain a first attribute analysis diagram, including: based on the 3D seismic data body and the stratigraphic interpretation data, the 3D seismic ant attribute analysis technology is used to analyze the faults, collapse columns and cracks of the rock formations underlying the coal seam to obtain the first attribute analysis diagram, and delineate the fault-crack development area; The second analysis unit is used to analyze the rock integrity of the underlying rock layer of the coal seam by using the three-dimensional seismic waveform difference analysis technology to obtain a second attribute analysis diagram, including: based on the three-dimensional seismic data body and the stratigraphic interpretation data, the three-dimensional seismic waveform difference analysis technology is used to analyze the rock integrity of the underlying rock layer of the coal seam, and the seismic waveform difference analysis result is set as x1, wherein the higher the x1 value is, the more broken the rock is, and the lower the x1 value is, the more complete the rock is; The third analysis unit is used to analyze the rock physical parameters of the underlying rock layer of the coal seam by using the three-dimensional seismic inversion technology to obtain the three-dimensional data body of the rock physical parameters of the underlying rock layer of the coal seam, including: based on the three-dimensional seismic data, the stratigraphic data, the interpretation data, the logging data, and the drilling data, the three-dimensional data body of the rock physical parameters of the resistivity, density, and porosity of the underlying rock layer of the coal seam is obtained by using the three-dimensional seismic inversion technology to analyze, and the resistivity inversion analysis result is set as x2, the density inversion analysis result is set as x3, and the porosity inversion analysis result is set as x4; The analysis result unit is used to perform multi-information fusion and cross-verification on the analysis results obtained in the above steps, and to conduct a comprehensive analysis of the water-richness of the underlying rock formation of the coal seam from multiple aspects; Among them, before obtaining the relevant attribute data of the underlying rock strata of the coal seam, first of all, three-dimensional seismic data, stratigraphic data, interpretation data, logging data, and drilling data in the study area are obtained.

5. The system according to claim 4, characterized in that The obtained analysis results are subjected to multi-information fusion and cross-validation, and the water-richness of the underlying rock formations of the coal seam is comprehensively analyzed from multiple aspects, including: The obtained analysis results are fused with multiple information, and the large value area of ​​the fused analysis results is superimposed with the delineated fault-crack development area, and the overlapping area is determined as the area with strong water richness.

6. The system according to claim 5, characterized in that: Normalize the obtained analysis results, set the normalized results of x1, x2, x3, x4 to y1, y2, y3, y4, and then use PCA principal component analysis to determine the weight coefficients a1, a2, a3, a4 of y1, y2, y3, y4. Therefore, the fusion analysis result z is expressed as formula (1): z=|a1|*y1-|a2|*y2-|a3|*y3+|a4|*y4 (1) Among them, the larger the z value of the fusion analysis result, the stronger the water-richness. The area with large z value overlaps with the delineated fault-crack development area, and the overlapping area is determined to be an area with strong water-richness.

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