Gas disaster classification management method

Abstract

The present invention discloses a method for graded gas disaster management, comprising: establishing a gas-enrichment geological model based on acquired geological data of target mining area geological units; performing pressure zoning based on the acquired geological data of the target mining area geological units; analyzing underground gas extraction and drainage data and surface gas test drainage data of the target mining area geological units to obtain analysis result data and establish a gas extraction model; and combining the gas-enrichment geological model, pressure zoning, analysis result data, and production urgency parameters to grade hidden dangers in the target mining area geological units and formulate a graded management plan. The present invention can optimize gas disaster management effectiveness and improve production safety.

Description

Technical Field

[0001] The present invention relates to the field of carbon emission reduction, and in particular to a gas disaster classification management method. Background Art

[0002] The existing gas disaster management is mainly based on underground gas extraction. The ground gas extraction is mostly based on economic benefits and is deployed and extracted from the dimension of coalbed methane production. It is not specifically aimed at gas disaster management and utilization.

[0003] Existing surface coalbed methane extraction technology assumes that coalbed methane is primarily absorbed gas. It uses a slow, steady, continuous, and long-term approach to control the drop in production pressure differentials, employing an overall pressure reduction approach. This technology deviates from and is out of step with the need to quickly address localized gas outbursts, abnormally high pressure points, and eliminate safety hazards during coal mining. Furthermore, to maximize the ultimate recovery rate of coalbed methane, existing technology utilizes a comprehensive extraction and utilization strategy based on reservoir geological information, maintaining an overall balanced extraction rate without any grading or differentiation, resulting in poor gas disaster management effectiveness. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the gas disaster control effect in the prior art is poor, resulting in poor production safety.

[0005] In order to solve the above technical problems, the present invention provides a gas disaster classification management method.

[0006] A gas disaster classification management method, comprising:

[0007] Establish a gas enrichment geological model based on the geological data of the target mining area geological units;

[0008] Conduct pressure zoning based on the geological data of the target mining area geological units;

[0009] Analyze the underground gas drainage data and surface gas test drainage data of the geological unit of the target mining area to obtain analysis result data and establish a gas extraction model;

[0010] Based on the gas enrichment geological model, pressure zoning, analysis result data and production urgency parameters, the geological units of the target mining area are classified into hidden dangers and a graded treatment plan is formulated.

[0011] In one embodiment, the process of establishing a gas enrichment geological model based on the obtained geological data of the geological unit of the target mining area includes:

[0012] Analyze the structural characteristics of the target mining area and establish a structural model of the geological unit;

[0013] Analyze the sedimentary environment and sedimentary characteristics of the target mining area and establish a sedimentary model of the geological unit;

[0014] Analyze the gas content characteristics of the target mining area and establish a gas content characteristic model of the geological unit;

[0015] The results of the structural model of the geological unit, the sedimentary model of the geological unit and the gas-bearing characteristic model of the geological unit are superimposed to establish a gas-enrichment geological model of the geological unit in the target mining area.

[0016] In one embodiment, the structural characteristics analysis of the target mining area and the establishment of a structural model of the geological unit include:

[0017] Drilling multiple gas geological exploration holes in the target mining area to obtain core, depth, and logging data of strata and coal seams;

[0018] Based on the principles of sequence stratigraphy, the well logging data is used to perform stratigraphic division and comparison, and the stratigraphic position calibration data and breakpoint data of each borehole are obtained;

[0019] Draw structural contour lines of the horizon based on the coordinate data of the borehole, the drilling data set, and the horizon calibration data; compile a structural cross-section map based on the principles of structural geology and the breakpoint data; and compile a structural plane geological map of the horizon based on the structural contour lines and the structural cross-section map;

[0020] Conduct layer calibration with the logging results and layer calibration results and the seismic data volume;

[0021] Utilize the continuity of seismic data to divide and identify faults and tectonic units;

[0022] The structural plane geological map and the seismic interpretation result model are superimposed, fitted and unified to establish a structural model of the geological unit.

[0023] In one embodiment, after superimposing and fitting the structural plane geological map with the seismic interpretation result model to establish the structural model of the geological unit, the method further includes:

[0024] Conduct thin section observation and analysis under core microscope to obtain the fracture development situation;

[0025] The direction of fracture development is marked on the structural model of the geological unit to determine the favorable direction for gas escape.

[0026] In one embodiment, the analysis of the sedimentary environment and sedimentary characteristics of the target mining area and the establishment of a sedimentary model of the geological unit include:

[0027] Divide the logging phase sedimentary units based on the logging curves of the target horizons in the exploration wells;

[0028] Draw sedimentary facies and sedimentary microfacies maps based on borehole coordinate data, drilling data sets, and logging facies sedimentary unit division results;

[0029] Seismic facies sedimentary units are divided based on the morphology of seismic phase axes in seismic data;

[0030] The seismic facies unit and the sedimentary facies map results are superimposed, fitted and unified to establish a sedimentary model of the geological unit.

[0031] In one embodiment, the gas content characteristic analysis of the target mining area and the establishment of a gas content characteristic model of the geological unit include:

[0032] Obtain coal cores during drilling in the target mining area, analyze and test the coal cores to obtain relevant geological parameters, including gas content, gas saturation, permeability, and vitrinite reflectance of the coal seam;

[0033] Prepare coal seam gas content isovalue map, gas saturation isovalue map, and coal seam metamorphic degree distribution map based on the borehole coordinate data, drilling data set, and the relevant geological parameters;

[0034] Establish a gas-bearing characteristic model for each target coal seam in the geological unit.

[0035] In one embodiment, the pressure zoning according to the obtained geological data of the geological unit of the target mining area includes:

[0036] Drill multiple exploration holes in the target mining area and conduct pressure testing and measurement on the target coal seam on the ground;

[0037] Obtain the ground stress parameter curve of the borehole and the pressure value of the pressure test;

[0038] For mining areas that have been mined, measure the downhole pressure at the corresponding locations in the mining area;

[0039] Based on the coordinate data of the pressure measurement points and the pressure measurement values, a pressure contour distribution map is drawn to determine the pressure distribution law;

[0040] Use gas-related parameter data to draw gas geological maps;

[0041] superimposing a pressure contour distribution line map on the gas-enriched geological model;

[0042] The geological units of the target mining area are divided into ultra-high pressure zone, high pressure zone, medium pressure zone and low pressure zone.

[0043] In one embodiment, the analysis of underground gas drainage data and surface gas test drainage data of the geological unit of the target mining area to obtain analysis result data and establish a gas extraction model includes:

[0044] Divide the target geological unit into multiple sub-areas according to gas enrichment degree and type, classify and name them, and classify them based on the classification to obtain a gas geological unit enrichment zoning and grading map;

[0045] Deploy and drill several surface gas drainage wells in each sub-area;

[0046] Conduct surface gas drainage experiments on drainage wells to obtain drainage production data on gas drainage related parameters;

[0047] Drawing a single well drainage curve diagram based on the drainage production data;

[0048] Summarize all the single well production data of each sub-area and determine the production rules of the single well in each sub-area;

[0049] Compare the production data between sub-areas to determine the differences in gas drainage rates between sub-areas due to different gas enrichment levels;

[0050] If the coal mine is already in mining, obtain the extraction and drainage production data of underground gas extraction related parameters;

[0051] Draw underground gas distribution change map in stages;

[0052] Summarize the production status of surface and underground drainage, compare the production data between sub-areas, and determine the differences in gas drainage rates between different sub-areas due to different gas enrichment levels;

[0053] Analyze the law and changing relationship between drainage speed and coal seam pressure;

[0054] Establish gas extraction models for each sub-area.

[0055] In one embodiment, the gas enrichment geological model, pressure zones, analysis result data, and production urgency parameters are combined to classify the hidden dangers of the geological units in the target mining area and formulate a graded treatment plan, including:

[0056] Different sub-areas are quantitatively rated based on gas enrichment, drainage rate, gas output, gas remaining volume, remaining recoverable volume, coal seam pressure, coal seam pressure drop rate, and production urgency;

[0057] Establish a gas classification model;

[0058] Identifying and grading existing gas risk sources based on the gas classification model;

[0059] Formulate corresponding gas classification control plans based on the classification results.

[0060] In one embodiment, after formulating a corresponding gas classification control plan based on the classification results, the method further includes:

[0061] Install pressure detectors underground and on the surface of surface extraction wells, and install pressure detectors in the main tunnels and extraction ports of underground gas extraction to record dynamic changes in coal seam pressure;

[0062] Establish a dynamic analysis system for gas extraction to obtain real-time information on the flow of residual gas and the distribution patterns of its reserves, abundance, and pressure. Re-evaluate the degree of residual gas enrichment in stages and update the gas risk rating of each sub-area in real time.

[0063] Establish a dynamic simulation model for residual gas;

[0064] Update the gas hazard classification level of each sub-area in real time and adjust the gas classification control plan.

[0065] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0066] By establishing a gas enrichment geological model and pressure zoning for the geological units of the target mining area, analyzing underground gas extraction data and surface gas test extraction data, and then classifying hidden dangers in combination with production urgency parameters, and determining a graded management plan for the geological units of the target mining area based on the hidden danger classification, it is helpful to achieve graded management of gas disasters, make gas disaster management more targeted, effectively and timely discharge gas accumulation and prominent hidden dangers, optimize the gas disaster management effect, and improve production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings, which include:

[0068] Figure 1 1 is a flow chart of a gas disaster classification management method according to an embodiment;

[0069] Figure 2 A schematic diagram of a process for establishing a gas enrichment geological model based on the obtained geological data of a geological unit in a target mining area in one embodiment;

[0070] Figure 3 A schematic diagram of a process for analyzing structural characteristics of a target mining area and establishing a structural model of a geological unit in one embodiment;

[0071] Figure 4 A schematic diagram of a process for analyzing the sedimentary environment and sedimentary characteristics of a target mining area and establishing a sedimentary model of a geological unit in one embodiment;

[0072] Figure 5A schematic diagram of a process for analyzing gas content characteristics of a target mining area and establishing a gas content characteristic model of a geological unit in one embodiment;

[0073] Figure 6 A schematic diagram of a process for drawing a pressure distribution map based on pressure test data of a geological unit in a target mining area and performing pressure zoning on the geological unit in the target mining area based on the pressure distribution map in one embodiment;

[0074] Figure 7 A schematic diagram of a process for analyzing underground gas drainage data and surface gas test drainage data of a geological unit in a target mining area to obtain analysis result data and establish a gas drainage model in one embodiment;

[0075] Figure 8 A schematic diagram of a process for classifying hidden dangers in target mining area geological units and formulating a graded remediation plan in accordance with an embodiment, combining a gas enrichment geological model, pressure zones, analysis result data, and production urgency parameters;

[0076] Figure 9 Schematic diagram of the flow of a gas disaster classification management method in another embodiment. DETAILED DESCRIPTION

[0077] To make the objectives, technical solutions, and advantages of the present invention more clear, the following detailed description of the implementation method of the present invention will be given in conjunction with the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Based on the specific embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention. Specific embodiment 1

[0079] A gas disaster classification management method is provided, such as Figure 1 As shown, the method includes:

[0080] S110: Establishing a gas enrichment geological model based on the obtained geological data of the geological units in the target mining area.

[0081] The target mining area geological unit refers to the geological unit of the mining area that needs to be treated for gas disasters. The gas enrichment geological model is a model used to illustrate the distribution of gas content.

[0082] S130: Draw a pressure distribution map based on the pressure test data of the geological unit of the target mining area, and perform pressure zoning on the geological unit of the target mining area based on the pressure distribution map.

[0083] Specifically, the pressure distribution pattern may be found based on the pressure distribution diagram to perform pressure zoning.

[0084] S150: Analyze the underground gas drainage data and the surface gas test drainage data of the geological unit of the target mining area to obtain analysis result data and establish a gas extraction model.

[0085] S170: Based on the gas enrichment geological model, pressure zoning, analysis results data and production urgency parameters, the geological units in the target mining area are classified for potential hazards and a graded treatment plan is formulated.

[0086] The production urgency parameter is a parameter used to characterize the production urgency and can be preset according to the production urgency requirements.

[0087] Specifically, different zoning and grading adopt different well types, well network types and well network densities to control different pressure relief speeds, pressure relief ranges and gas extraction speeds.

[0088] The above-mentioned method for graded gas disaster management establishes a gas enrichment geological model and pressure zoning for the geological units of the target mining area, analyzes underground gas extraction and drainage data and surface gas test extraction and drainage data, and then classifies hidden dangers in combination with production urgency parameters to determine the graded management plan for the geological units of the target mining area. This helps to achieve graded management of gas disasters, makes gas disaster management more targeted, effectively and timely discharges gas accumulation and prominent hidden dangers, optimizes the gas disaster management effect, and improves production safety. Specific embodiment 2

[0090] A gas disaster classification management method is provided, including: Figure 1 In this embodiment, as shown in step S110 to step S170. Figure 2 As shown, step S110 includes steps S111 to S117.

[0091] S111: Analyze the structural characteristics of the target mining area and establish a structural model of the geological unit.

[0092] For example, based on the obtained geological data such as geological outcrop data, drilling data, logging data, seismic data, etc., the structural characteristics of the geological units that need to be treated for gas disasters can be described and analyzed in detail.

[0093] S113: Analyze the sedimentary environment and sedimentary characteristics of the target mining area and establish a sedimentary model of the geological unit.

[0094] For example, based on the obtained geological data such as geological outcrop data, drilling data, logging data, experimental data, seismic data, etc., the sedimentary environment and sedimentary characteristics of the geological units that need to be treated for gas disasters are analyzed, and the sedimentary units are classified and divided based on the changes in the sedimentary rhythm of the reservoir, logging phase division, sedimentary phase division, sedimentation velocity changes, porosity, permeability and other data analysis.

[0095] S115: Analyze the gas content characteristics of the target mining area and establish a gas content characteristic model of the geological unit.

[0096] Specifically, based on the experimental data and laboratory information obtained, the coal quality, coal type characteristics, and gas content characteristics of the geological units that require gas disaster control are analyzed.

[0097] S117: Overlay the results of the structural model of the geological unit, the sedimentary model of the geological unit and the gas-bearing characteristic model of the geological unit to establish a gas enrichment geological model of the geological unit in the target mining area.

[0098] By integrating the structural model, sedimentary model, and gas-bearing characteristic model of the geological unit, a gas-enrichment geological model is established, which delineates areas of extremely high gas concentration, high gas concentration, secondary gas concentration, medium gas concentration, low gas concentration, and essentially no gas concentration. Specifically, different colors can be used to correspond to different areas, for example, with red, orange, yellow, green, cyan, and blue corresponding to extremely high gas concentration, high gas concentration, secondary gas concentration, medium gas concentration, low gas concentration, and essentially no gas concentration, respectively. Specific embodiment 3

[0100] A gas disaster classification management method is provided, including: Figure 1 Steps S110 to S170 are shown, wherein step S110 includes steps S111 to S117. Figure 3 As shown, in this embodiment, step S111 includes:

[0101] S310: Drill multiple gas geological exploration holes in the target mining area to obtain core, depth, and logging data of the strata and coal seams.

[0102] S320: Perform depth and inclination correction on the borehole drilling data.

[0103] S330: Based on the principles of sequence stratigraphy, well logging data is used to perform stratigraphic division and comparison, and the stratigraphic position calibration data and breakpoint data of each borehole are obtained.

[0104] Specifically, the stratigraphic division and comparison can be carried out using the results of logging curves, drilling data, core calibration, etc.

[0105] S340: Draw a structural profile within the geological unit of the target mining area; draw the structural contour lines of the target layer of the geological unit of the target mining area.

[0106] Specifically, a structural profile is compiled based on structural geology principles and breakpoint data. Specifically, structural contour lines of the target layer are drawn based on the coordinate data of the borehole, the drilling data set, and the layer calibration data.

[0107] S350: Prepare a structural plane geological map of the corresponding layer based on the structural contour lines and structural profiles.

[0108] S360: Deploy seismic construction and acquisition to obtain seismic data; process the seismic data.

[0109] S370: Perform layer calibration on the well logging results and layer calibration results with the seismic data volume.

[0110] S380: Use the continuity of seismic data to divide and identify faults and tectonic units.

[0111] S390: Overlay and unify the tectonic plane geological map with the seismic interpretation model, establish the tectonic model of the geological unit, and divide the tectonic geological units.

[0112] Specifically, step S390 may also include: performing thin-section observation and analysis under a core microscope to obtain the development of fractures; marking the direction of fracture development on the structural model of the geological unit to determine the favorable direction for gas escape.

[0113] For example, core data, tectonic evolution history, and regional tectonic characteristics are used to analyze the fracture development of relevant strata and mineral target layers in geological units that require gas disaster management, such as the density, direction, depth, intersection angle of conjugate fractures, number of fracture development groups, direction of main fractures, presence or absence of filling, mineral composition of filling materials, etc., to find out the direction that is conducive to gas desorption and escape.

[0114] Specific Example 4

[0115] A gas disaster classification management method is provided, including: Figure 1 Steps S110 to S170 are shown, wherein step S110 includes steps S111 to S117. In this embodiment, Figure 4 As shown, step S113 includes:

[0116] S410: Drill multiple gas geological exploration holes in the target mining area to obtain core, depth, and logging data of the strata and coal seams; perform depth and inclination corrections on the borehole drilling data; and perform stratigraphic division and comparison based on the principles of sequence stratigraphy, using logging curves, drilling data, core calibration, and other results to obtain the stratum calibration for each borehole.

[0117] S420: Perform layer calibration and core description on the obtained core to calibrate the sedimentary environment of the core.

[0118] S430: Based on the above results, multiple logging phase standard profiles are established.

[0119] S440: Combined with the core description, the target layer of the logging curve obtained from the exploration well is divided into logging phase sedimentary units.

[0120] S450: Confirm the division of logging phase sedimentary units based on the drilling and coring results.

[0121] S460: Draw sedimentary facies and sedimentary microfacies maps based on the borehole coordinate data, drilling data set, and logging facies sedimentary unit division results.

[0122] S470: Divide the seismic facies sedimentary units according to the morphology of seismic phase axes in the seismic data.

[0123] S480: Superimpose and unify the seismic facies units with the sedimentary facies map results to establish a sedimentary model of the geological unit.

[0124] Specific Example 5

[0125] A gas disaster classification management method is provided, including: Figure 1 Steps S110 to S170 are shown, wherein step S110 includes steps S111 to S117. In this embodiment, Figure 5 As shown, step S115 includes:

[0126] S510: Drill multiple gas geological exploration holes in the target mining area and obtain coal cores during the drilling process.

[0127] S520: Analyze and test the coal core according to geological requirements to obtain relevant geological parameters such as gas content, gas saturation, permeability, and vitrinite reflectance of the coal seam.

[0128] S530: Prepare coal seam gas content contour map, gas saturation contour map, coal seam metamorphic degree distribution map, etc. based on the borehole coordinate data, drilling data set and relevant geological parameters.

[0129] S540: Establish a gas-bearing characteristic model for each target coal seam in the geological unit.

[0130] Specific Example 6

[0131] A gas disaster classification management method is provided, including: Figure 1 In this embodiment, as shown in step S110 to step S170. Figure 6 As shown, step S130 includes:

[0132] S601: Drill multiple exploration holes in the target mining area and conduct pressure testing and measurement of the target coal seam on the ground.

[0133] S602: Obtain the ground stress parameter curve of the borehole and the pressure value of the pressure test.

[0134] S603: For mining areas that have already been mined, measure the downhole pressure at corresponding locations in the mining area.

[0135] S604: Based on the coordinate data of the pressure measurement points and the pressure measurement values, a pressure contour distribution map is drawn to determine the pressure distribution pattern.

[0136] S605: Draw a gas geological map using gas-related parameter data.

[0137] S606: Overlaying the pressure contour distribution map on the gas-enriched geological model.

[0138] S607: Based on the relevant national regulations on gas control and model results, the geological units of the target mining area are divided into ultra-high pressure areas, high pressure areas, medium pressure areas and low pressure areas according to the pressure distribution.

[0139] Specific Example 7

[0140] A gas disaster classification management method is provided, including: Figure 1 In this embodiment, as shown in step S110 to step S170. Figure 7 As shown, step S150 includes:

[0141] S701: Superimpose the pressure zoning map on the gas enrichment geological model.

[0142] S702: Based on the superposition results, the geological units of the target mining area are divided into multiple sub-areas according to the gas enrichment degree and enrichment type. These sub-areas are classified and named, and graded based on the classification to obtain a gas geological unit enrichment zoning and grading map.

[0143] S703: Based on the above results and according to the actual production and safety needs, several surface gas extraction wells are deployed and drilled in each sub-area.

[0144] S704: Conduct surface gas drainage experiments on the drainage wells to obtain drainage production data on gas drainage related parameters, such as daily liquid production, daily gas production, formation pressure and formation pressure change rate, production pressure difference, liquid level depth, casing pressure, oil pressure, back pressure, indicator diagram, and other parameters.

[0145] S705: Based on the pumping and production data, a single well production curve is drawn, including the actual production relationship curve of liquid production, gas production, pressure, liquid level, pressure difference, and production time.

[0146] S706: Summarize the production data of all single wells in each sub-area and use the principles and methods of oil and gas reservoir dynamic analysis to find out the production rules of single wells in each sub-area.

[0147] S707: Compare the production data between the sub-areas to find out the differences in gas drainage rates between different sub-areas due to different gas enrichment levels.

[0148] S708: If the coal mine is already in mining, obtain underground gas extraction production data of related parameters, such as return air volume, methane concentration, continuity of underground extraction, and the relationship between underground extraction speed and underground production pressure drop.

[0149] S709: Draw a map of underground gas distribution changes in stages.

[0150] S710: Summarize the production status of surface and underground drainage, compare the production data between sub-areas, and find out the differences in gas drainage speed between different sub-areas due to different gas enrichment levels.

[0151] S711: Analyze and find out the rules and changing relationship between drainage speed and coal seam pressure.

[0152] S712: Establish gas extraction models for each sub-area.

[0153] For example, the factors affecting the depressurization rate, depressurization area and affected range of the gas reservoir can be analyzed based on the downhole gas extraction data and the surface gas test extraction data, with a focus on analyzing the degree and manner in which the well type, well network, horizontal well and directional well drilling direction, drainage rate, gas enrichment degree and gas enrichment method affect the depressurization rate and depressurization range area.

[0154] Specific Example 8

[0155] A gas disaster classification management method is provided, including: Figure 1 In this embodiment, as shown in step S110 to step S170. Figure 8 As shown, step S170 includes:

[0156] S801: Quantitatively rate different sub-areas based on parameters such as gas enrichment, drainage rate, gas output, gas remaining volume, remaining recoverable volume, coal seam pressure, coal seam pressure drop rate, and production urgency.

[0157] S802: Establish a gas classification model.

[0158] S803: Identify and rank existing gas risk sources based on the gas classification model.

[0159] S804: Develop corresponding gas classification control plans based on the classification results.

[0160] For example, after obtaining parameters such as the gas enrichment level, pressure distribution, structural complexity, and production urgency of the geological unit in the target mining area, hierarchical positioning is performed, as shown in Table 1 (the urgency of production is judged based on actual production conditions such as whether there are gas disasters, gas outbursts, and high gas levels that make normal safe production impossible).

[0161] Table 1

[0162] Parameters\Levels 1 2 3 4 5 6 Gas enrichment Very enriched Enrichment sub-enriched areas medium generally Almost no enrichment Pressure distribution Abnormally high pressure high pressure Medium pressure General pressure Lower pressure Low pressure Production urgency Very urgent urgent need normal mid-term plan Long-term plans Structural complexity Simple generally medium complex More complex Extremely complex

[0163] The parameter is assigned a value based on its importance within the geological unit. The maximum score can be 10 or 100, depending on the needs of gas hazard classification and subdivision. Taking the 100-point scale as an example, a score greater than 90 indicates emergency gas disaster management, 80-90 indicates rapid gas disaster management, 70-80 indicates comprehensive gas disaster management, 60-70 indicates conventional gas disaster management, 40-60 indicates underground gas disaster pre-extraction and drainage management plus underground production drainage and drainage management, and less than 40 indicates underground gas production drainage and drainage management. A score of less than 60 does not require surface gas disaster management.

[0164] Specifically, it can be based on the level of hidden dangers, gas enrichment geological model, hydrogeological conditions, etc., referring to the results of extraction and drainage data analysis, and at the same time based on the funding situation of disaster management and the economic benefits of gas conversion and utilization, etc., to deploy appropriate well locations, suitable well types, well network density, drainage speed, appropriate ground and underground extraction and drainage coordination modes to control and transform gas disasters.

[0165] Specific Example 9

[0166] A gas disaster classification management method is provided, including: Figure 1 In this embodiment, as shown in step S110 to step S170. Figure 9 As shown, after step S170, specifically after step S804, the following steps may be further included:

[0167] S901: Install pressure detectors underground and on the surface of surface extraction wells, and install pressure detectors in the main tunnels and extraction ports of underground gas extraction to record dynamic changes in coal seam pressure.

[0168] S902: Establish a dynamic analysis system for gas extraction to grasp the residual gas flow and the distribution patterns of residual gas parameters such as reserves, abundance, and pressure in real time, re-rate the residual gas enrichment level in stages, and update the gas risk rating of each sub-area in real time.

[0169] S903: Establish a dynamic simulation model of residual gas.

[0170] S904: Update the gas hazard classification level of each sub-area in real time and adjust the gas classification control plan in a timely manner.

[0171] After applying the treatment plan to the target mining area's geological units, the gas distribution will change as gas is extracted. Dynamic monitoring is conducted during the implementation of the gas classification treatment plan. Using surface drainage production data and underground gas drainage monitoring data, new abnormally high pressure and localized enrichment areas formed by gas extraction disrupting the adsorption and desorption balance in the coal seam are evaluated and graded in the next cycle. This process is repeated until the hidden dangers are completely eliminated or controlled.

[0172] Compared with the prior art, the present invention has at least one of the following advantages:

[0173] 1. Provides detailed evidence support for scientific judgment of gas control methods;

[0174] 2. Provides a set of concise and easy-to-use methods for judging gas control methods;

[0175] 3. Improve the conversion and utilization rate of gas-rich areas;

[0176] 4. Reduce unnecessary input in gas non-enriched areas;

[0177] 5. It can be more targeted in the management of gas disasters, effectively and timely eliminate hidden dangers of gas accumulation and protrusion, and make the use of disaster management funds more effective.

[0178] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0179] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0180] Although the embodiments disclosed herein are as described above, the contents described herein are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A gas disaster classification management method, characterized in that: include: Establish a gas enrichment geological model based on the geological data of the target mining area geological units; Conduct pressure zoning based on the geological data of the target mining area geological units; Analyze the underground gas drainage data and surface gas test drainage data of the geological unit of the target mining area to obtain analysis result data and establish a gas extraction model; Based on the gas enrichment geological model, pressure zones, analysis result data and production urgency parameters, the geological units of the target mining area are classified into risk categories and a graded treatment plan is formulated; The method of analyzing the underground gas drainage data and the surface gas test drainage data of the geological unit of the target mining area to obtain analysis result data and establish a gas extraction model includes: Divide the target geological unit into multiple sub-areas according to gas enrichment degree and type, classify and name them, and classify them based on the classification to obtain a gas geological unit enrichment zoning and grading map; Deploy and drill several surface gas drainage wells in each sub-area; Conduct surface gas drainage experiments on drainage wells to obtain drainage production data on gas drainage related parameters; Drawing a single well drainage curve diagram based on the drainage production data; Summarize all the single well production data of each sub-area and determine the production rules of the single well in each sub-area; Compare the production data between sub-areas to determine the differences in gas drainage rates between sub-areas due to different gas enrichment levels; If the coal mine is already in mining, obtain the extraction and drainage production data of underground gas extraction related parameters; Draw underground gas distribution change map in stages; Summarize the production status of surface and underground drainage, compare the production data between sub-areas, and determine the differences in gas drainage rates between different sub-areas due to different gas enrichment levels; Analyze the law and changing relationship between drainage speed and coal seam pressure; Establish gas extraction models for each sub-area; The method of combining the gas enrichment geological model, pressure zones, analysis result data and production urgency parameters to classify the hidden dangers of the geological units in the target mining area and formulate a graded treatment plan includes: Different sub-areas are quantitatively rated based on gas enrichment, drainage rate, gas output, gas remaining volume, remaining recoverable volume, coal seam pressure, coal seam pressure drop rate, and production urgency; Establish a gas classification model; Identifying and grading existing gas risk sources based on the gas classification model; Formulate corresponding gas classification control plans based on the classification results; After formulating the corresponding gas classification control plan based on the classification results, it also includes: Install pressure detectors underground and on the surface of surface extraction wells, and install pressure detectors in the main tunnels and extraction ports of underground gas extraction to record dynamic changes in coal seam pressure; Establish a dynamic analysis system for gas extraction to obtain real-time information on the flow of residual gas and the distribution patterns of its reserves, abundance, and pressure. Re-evaluate the degree of residual gas enrichment in stages and update the gas risk rating of each sub-area in real time. Establish a dynamic simulation model for residual gas; Update the gas hazard classification level of each sub-area in real time and adjust the gas classification control plan.

2. The method according to claim 1, characterized in that The gas enrichment geological model is established based on the geological data of the target mining area geological unit, including: Analyze the structural characteristics of the target mining area and establish a structural model of the geological unit; Analyze the sedimentary environment and sedimentary characteristics of the target mining area and establish a sedimentary model of the geological unit; Analyze the gas content characteristics of the target mining area and establish a gas content characteristic model of the geological unit; The results of the structural model of the geological unit, the sedimentary model of the geological unit and the gas-bearing characteristic model of the geological unit are superimposed to establish a gas-enrichment geological model of the geological unit in the target mining area.

3. The method according to claim 2, characterized in that The structural characteristics analysis of the target mining area and establishment of a structural model of the geological unit include: Drilling multiple gas geological exploration holes in the target mining area to obtain core, depth, and logging data of strata and coal seams; Based on the principles of sequence stratigraphy, the well logging data is used to perform stratigraphic division and comparison, and the stratigraphic position calibration data and breakpoint data of each borehole are obtained; Draw structural contour lines of the horizon based on the coordinate data of the borehole, the drilling data set, and the horizon calibration data; compile a structural cross-section map based on the principles of structural geology and the breakpoint data; and compile a structural plane geological map of the horizon based on the structural contour lines and the structural cross-section map; Conduct layer calibration with the logging results and layer calibration results and the seismic data volume; Utilize the continuity of seismic data to divide and identify faults and tectonic units; The structural plane geological map and the seismic interpretation result model are superimposed, fitted and unified to establish a structural model of the geological unit.

4. The method according to claim 3, characterized in that After the structural plane geological map and the seismic interpretation result model are superimposed and fitted to establish the structural model of the geological unit, the method further includes: Conduct thin section observation and analysis under core microscope to obtain the fracture development situation; The direction of fracture development is marked on the structural model of the geological unit to determine the favorable direction for gas escape.

5. The method according to claim 2, characterized in that The analysis of the sedimentary environment and sedimentary characteristics of the target mining area and the establishment of a sedimentary model of the geological unit include: Divide the logging phase sedimentary units based on the logging curves of the target horizons in the exploration wells; Draw sedimentary facies and sedimentary microfacies maps based on borehole coordinate data, drilling data sets, and logging facies sedimentary unit division results; Seismic facies sedimentary units are divided based on the morphology of seismic phase axes in seismic data; The seismic facies unit and the sedimentary facies map results are superimposed, fitted and unified to establish a sedimentary model of the geological unit.

6. The method according to claim 2, characterized in that The gas content characteristic analysis of the target mining area and the establishment of a gas content characteristic model of the geological unit include: Obtain coal cores during drilling in the target mining area, analyze and test the coal cores to obtain relevant geological parameters, including gas content, gas saturation, permeability, and vitrinite reflectance of the coal seam; Prepare coal seam gas content isovalue map, gas saturation isovalue map, and coal seam metamorphic degree distribution map based on the borehole coordinate data, drilling data set, and the relevant geological parameters; Establish a gas-bearing characteristic model for each target coal seam in the geological unit.

7. The method according to claim 1, characterized in that The pressure zoning according to the obtained geological data of the geological units of the target mining area includes: Drill multiple exploration holes in the target mining area and conduct pressure testing and measurement of the target coal seam on the ground; Obtain the ground stress parameter curve of the borehole and the pressure value of the pressure test; For mining areas that have been mined, measure the downhole pressure at the corresponding locations in the mining area; Based on the coordinate data of the pressure measurement points and the pressure measurement values, a pressure contour distribution map is drawn to determine the pressure distribution law; Use gas-related parameter data to draw gas geological maps; superimposing a pressure contour distribution line map on the gas-enriched geological model; The geological units of the target mining area are divided into ultra-high pressure zone, high pressure zone, medium pressure zone and low pressure zone.

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