A coal seam target geological structure identification method, system and device

Abstract

This application discloses a method, system, and device for identifying target geological structures in coal seams. The target geological structures include folds, faults, lower local thickening zones, and upper local thickening zones. The method acquires full measured data of cross-layer boreholes in the target longwall face, along with the strike, dip, and true dip parameters of the coal seam. Preprocessing yields the three-dimensional coordinates of the borehole entry point, the three-dimensional coordinates of the exit point, and the true thickness of the coal seam. A square nine-grid analysis window is constructed with the strike and dip of the coal seam as the directional reference. Target cross-layer boreholes with stable coal seam thickness are selected based on the deviation of the true thickness of the coal seam. A spatial plane equation of the coal seam is established to calculate the theoretical entry point elevation of the target cross-layer borehole, generating regional target geological structure identification results. A sliding window traverses the entire longwall face, outputting the overall regional target geological structure identification results. This method can stably identify hidden small target geological structures and significantly improves computational efficiency compared to traditional methods. It can be widely applied to advanced geological exploration scenarios in coal mine longwall faces.

Description

Technical Field

[0001] This application relates to the field of data synchronization technology, and in particular to a method, system and device for identifying the geological structure of coal seams. Background Technology

[0002] In the course of mine production, the accidental discovery of geological structures that were not identified during the exploration phase often leads to production delays and, in severe cases, may even trigger safety accidents such as gas outbursts and rock bursts. In recent years, with the continuous increase in coal mining depth, the threat posed by hidden small geological structures to safe production has become increasingly prominent.

[0003] Therefore, how to achieve advanced prediction and accurate forecasting of the geological structure of hidden targets has become a key task in coal mine production geology.

[0004] Traditional geophysical exploration methods primarily rely on geophysical principles to detect underground structures. For example, seismic exploration infers structural morphology by analyzing the reflection or refraction characteristics of artificially induced seismic waves at geological interfaces; electrical exploration utilizes the electrical differences between rocks, coal seams, and structural zones to identify anomalies by observing the distribution of the electric field generated by the current; in addition, ground-penetrating radar can be used to detect shallow strata, or rock physical parameters can be directly obtained through borehole logging.

[0005] The above traditional methods are effective for detecting large-scale structures that cause significant disturbances to the strata or physical fields.

[0006] However, due to their small scale and subtle differences in physical properties, the geological structures of concealed targets produce low-intensity anomalous signals, often below the resolution limit of traditional methods, or easily submerged in noise, resulting in unsatisfactory detection results. Currently, the prediction of geological structures of concealed targets still mainly relies on traditional geophysical methods and experience-based judgment, which is insufficient to effectively address such small-scale and highly concealed geological problems.

[0007] With the widespread application of intelligent and unmanned mining technologies in my country's coal mines, the construction of smart mines has become an inevitable trend in the coal industry. Achieving intelligent mining requires a high-precision 3D model of the coal seam. Currently, initial 3D modeling of coal seams mainly relies on data from boreholes, 3D seismic data, trench CT, and 3D roadway scanning. However, due to varying data sources and processing methods, the constructed models often have significant errors, and their vertical resolution is insufficient for precise identification, making it even more difficult to handle the prediction of hidden geological structures. Summary of the Invention

[0008] The main objective of this application is to provide a method, system, and apparatus for identifying the geological structure of coal seams, thereby addressing at least one of the aforementioned deficiencies.

[0009] To achieve the above objectives, firstly, this application proposes a method for identifying the geological structure of coal seams, comprising the following steps:

[0010] Step S1: Obtain the measured data of the cross-layer borehole of the target longwall face, and obtain the strike azimuth, dip azimuth and true dip angle of the target coal seam;

[0011] Step S2: Preprocess the measured data of the cross-layer borehole. Based on the preprocessed measured data of the cross-layer borehole, obtain the three-dimensional coordinates of the coal entry point, the three-dimensional coordinates of the coal exit point, and the true thickness of the coal seam corresponding to the cross-layer borehole.

[0012] Step S3: Using any effective cross-layer borehole in the target mining face as the central cross-layer borehole, construct a pre-sized square nine-grid analysis window with the strike azimuth and dip azimuth as the direction reference. Within the square nine-grid analysis window, determine 8 effective cross-layer boreholes evenly distributed around the central cross-layer borehole as peripheral cross-layer boreholes to obtain the nine-grid analysis group.

[0013] Step S4: Based on the preset coal seam thickness difference threshold and the true coal seam thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, select target cross-layer boreholes with stable coal seam thickness.

[0014] Step S5: Using the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establish the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitute the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole.

[0015] Step S6: Based on the three-dimensional coordinates of the coal extraction point and the preset elevation deviation threshold, according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, obtain the regional coal seam target geological structure identification results between the central cross-layer borehole and the target cross-layer borehole.

[0016] Step S7: Slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained regional coal seam target geological structure identification results to obtain the full-area coal seam target geological structure identification results of the target mining face.

[0017] In one embodiment, the measured data of the through-layer drilling includes:

[0018] Unique identifier for cross-layer boreholes, segmented inclination data of cross-layer boreholes, measured coal entry depth of cross-layer boreholes, measured coal extraction depth of cross-layer boreholes, coal core recovery rate of cross-layer boreholes, as-built design deviation data of cross-layer boreholes, on-site measured effective gas extraction radius of cross-layer boreholes, and relative position data of cross-layer borehole plane coordinates to the target longwall face.

[0019] In one embodiment, step S2 includes:

[0020] The measured data from the cross-layer borehole were cleaned and standardized.

[0021] Based on the unique identifier of the cross-layer borehole and the segmented inclination measurement data of the cross-layer borehole, the spatial trajectory of the entire cross-layer borehole is calculated using the radius of curvature method.

[0022] Based on the measured coal entry depth and measured coal exit depth, and based on the entire spatial trajectory, the three-dimensional coordinates of the coal entry point and the three-dimensional coordinates of the coal exit point are obtained by linear interpolation.

[0023] The apparent thickness of the coal seam is obtained by the difference between the measured depth of coal entry and the measured depth of coal exit. The true thickness of the coal seam is obtained by combining the corrected angle between the axis of the cross-layer borehole and the normal of the target coal seam. The corrected angle is determined by the segmented inclination data of the cross-layer borehole, the strike azimuth angle and the true dip angle of the target coal seam.

[0024] In one embodiment, the method for constructing a pre-sized square grid analysis window with the heading azimuth and dip azimuth as directional references in step S3 includes:

[0025] The product of the actual measured effective gas extraction radius of the cross-layer borehole and the preset input coefficient is used as the side length of the square nine-square grid analysis window;

[0026] Set the two sets of opposite sides of the square nine-square analysis window to be parallel to the strike and dip of the target coal seam, respectively;

[0027] Using the plane coordinates of the coal entry point of the central through-layer borehole as the geometric center of the window, a square nine-square grid analysis window is constructed.

[0028] In one embodiment, step S4 includes:

[0029] Calculate the arithmetic mean of the true coal seam thickness of all valid cross-layer boreholes in the nine-square grid analysis group, and use it as the benchmark value for coal seam thickness.

[0030] The absolute value of the difference between the true thickness of the coal seam from a single-penetration borehole and the reference value of the coal seam thickness is taken as the absolute deviation of the true thickness of the coal seam.

[0031] The ratio of the absolute deviation of the true thickness of the coal seam to the benchmark value of the coal seam thickness is used as the relative deviation of the true thickness of the coal seam.

[0032] Cross-seam boreholes whose relative deviation from the true thickness of the coal seam does not exceed a preset coal seam thickness difference threshold are selected as target cross-seam boreholes with stable coal seam thickness. The preset coal seam thickness difference threshold is set according to the thickness classification of the target coal seam.

[0033] In one embodiment, step S5 includes:

[0034] Using the three-dimensional coordinates of the coal entry point of the central cross-layer borehole as the known reference point of the coal seam spatial plane, and combining the strike azimuth and true dip angle of the target coal seam, the unit normal vector of the coal seam plane is determined, and the spatial plane equation of the target coal seam is established.

[0035] The spatial plane equation is transformed by elevation calculation. Substituting the plane coordinate components from the three-dimensional coordinates of the coal entry point of the target cross-layer borehole, the theoretical coal entry point elevation of the target cross-layer borehole is obtained. The expression for the theoretical coal entry point elevation is as follows:

[0036]

[0037] in, Let be the theoretical coal entry point elevation of the i-th target cross-layer borehole. The elevation component in the three-dimensional coordinates of the central cross-layer borehole coal entry point. Let be the difference in X-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. Let be the difference in Y-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. The strike azimuth of the target coal seam. The true dip angle of the target coal seam.

[0038] In one embodiment, the elevation deviation value includes an absolute elevation deviation value and a relative elevation deviation value, and the elevation deviation threshold includes an absolute elevation deviation threshold and a relative elevation deviation threshold. Step S6 includes:

[0039] The absolute value of the difference between the measured elevation component and the theoretical elevation of the coal entry point in the three-dimensional coordinates of the target cross-layer borehole is taken as the absolute elevation deviation value, and the ratio of the absolute elevation deviation value to the coal seam thickness benchmark value of the nine-square grid analysis group is taken as the relative elevation deviation value.

[0040] A target cross-layer borehole that simultaneously satisfies both an absolute elevation deviation value greater than or equal to an absolute elevation deviation threshold and a relative elevation deviation value greater than or equal to a relative elevation deviation threshold is considered a preliminary abnormal borehole.

[0041] Based on the spatial plane equation, the theoretical coal extraction point elevation corresponding to the preliminary abnormal borehole is calculated and compared with the measured elevation component in the three-dimensional coordinates of the coal extraction point corresponding to the preliminary abnormal borehole, so as to verify the consistency of roof and floor slippage and mark the preliminary abnormal borehole that passes the verification as a valid abnormal borehole.

[0042] When there are at least two valid anomalous boreholes in adjacent directions within the same nine-square grid analysis window, it is determined that there is a coal seam target geological structure between the central cross-layer borehole and the corresponding valid anomalous borehole, and the regional coal seam target geological structure identification results are obtained.

[0043] In one embodiment, step S7 includes:

[0044] Using the preset ratio of the side length of the square nine-square grid analysis window as the sliding step size, an S-shaped path is used to traverse the entire area of ​​the target mining face so that the overlap rate of adjacent windows is not lower than the preset overlap rate threshold.

[0045] The target longwall face is divided into grid units of equal size, and the identification results of the target geological structure of the coal seam in each grid unit are statistically analyzed by voting.

[0046] Based on the multi-window result voting fusion rule, grid cells that are determined to have target geological structures by a preset number or more analysis windows are identified as effective coal seam target geological structure areas, and the remaining grid cells are marked as suspected abnormal areas or areas without abnormalities.

[0047] Spatial fitting is performed on the effective coal seam target geological structure region, and the output is the full-area coal seam target geological structure identification result including the spatial location, occurrence and elevation of the target geological structure.

[0048] Secondly, to achieve the above objectives, this application also proposes a coal seam target geological structure identification system, comprising:

[0049] The data acquisition module is used to execute step S1, acquire the measured data of the cross-layer borehole of the target longwall face, and acquire the strike azimuth, dip azimuth and true dip angle of the target coal seam;

[0050] The data preprocessing module is used to perform step S2, preprocess the measured data of the cross-layer borehole, and obtain the three-dimensional coordinates of the coal inlet point, the three-dimensional coordinates of the coal outlet point, and the true thickness of the coal seam based on the preprocessed measured data of the cross-layer borehole.

[0051] The analysis window construction module is used to execute step S3, taking any effective cross-layer borehole in the target mining face as the center cross-layer borehole, constructing a pre-sized square nine-square grid analysis window with the strike azimuth and dip azimuth as the direction reference, and determining 8 effective cross-layer boreholes evenly distributed around the center cross-layer borehole as the peripheral cross-layer boreholes within the square nine-square grid analysis window to obtain the nine-square grid analysis group.

[0052] The target cross-layer borehole screening module is used to perform step S4, based on the preset coal seam thickness difference threshold and the coal seam true thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, to screen out target cross-layer boreholes with stable coal seam thickness.

[0053] The theoretical coal entry point elevation calculation module is used to execute step S5, which uses the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establishes the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitutes the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole.

[0054] The regional coal seam target geological structure identification module is used to execute step S6, based on the three-dimensional coordinates of the coal outlet point and the preset elevation deviation threshold, and according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, to obtain the regional coal seam target geological structure identification result between the central cross-layer borehole and the target cross-layer borehole.

[0055] The whole-area coal seam target geological structure identification module is used to execute step S7, slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained sub-area coal seam target geological structure identification results to obtain the whole-area coal seam target geological structure identification results of the target mining face.

[0056] Thirdly, to achieve the above objectives, this application also proposes a coal seam target geological structure identification device, the device comprising: a memory, a processor, and a coal seam target geological structure identification program stored in the memory and executable on the processor, the coal seam target geological structure identification program being configured to implement the steps of the method as described in any one of the first aspects.

[0057] This application provides a method for identifying the geological structure of coal seam targets. By reusing the measured data of existing cross-layer boreholes in the target mining face and combining the strike azimuth, dip azimuth, and true dip angle of the coal seam as the analysis benchmark for the entire process, it achieves the beneficial effect of eliminating the need for additional drilling and geophysical exploration costs while ensuring that the analysis benchmark is completely matched with the actual occurrence state of the coal seam.

[0058] By constructing a square nine-grid analysis window with the coal seam strike and dip as the directional reference, and establishing a nine-grid analysis group consisting of one central cross-layer borehole and eight peripheral cross-layer boreholes, the traditional full-face comparison was decomposed into local nine-hole analysis, reducing the single-window calculation workload by more than 90% and significantly improving the overall analysis efficiency.

[0059] By screening target cross-layer boreholes with stable coal seam thickness based on the difference between the true thickness of the coal seam and the preset threshold for the difference in coal seam thickness, non-tectonic interferences such as the original thickness variation of the coal seam and scour zone are eliminated in advance, thereby reducing the misjudgment rate of target geological structure identification from the root.

[0060] By taking the central cross-layer borehole entry point as the benchmark, and combining the coal seam strike and true dip angle to establish the coal seam spatial plane equation, and substituting the plane coordinate components to calculate the theoretical coal seam entry point elevation of the target cross-layer borehole, a standardized and reproducible unstructured coal seam elevation benchmark model was obtained. This model can stably capture weak elevation changes at the 0.3m level, and significantly improve the accuracy of identifying the geological structure of hidden small targets.

[0061] By combining the three-dimensional coordinates of the coal extraction point with a preset elevation deviation threshold and elevation deviation value, the target geological structure identification results of the coal seam in different regions were generated. This significantly improved the accuracy of target geological structure identification by eliminating false anomalies caused by drilling construction errors through dual-dimensional verification of the coal seam roof and floor.

[0062] By traversing the entire working face through a fixed-step sliding nine-square grid analysis window and combining the results of multi-window voting to output the full-area identification results, a full-coverage scanning of the working face without blind spots was achieved, eliminating accidental misjudgments from single windows, and finally outputting highly reliable full-area target geological structure identification results that can be directly used for on-site mining design. Attached Figure Description

[0063] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0064] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 This is a flowchart illustrating an embodiment of the coal seam target geological structure identification method in this application;

[0066] Figure 2 This is a schematic diagram of a structure provided for an embodiment of the coal seam target geological structure identification system in this application;

[0067] Figure 3 This is a schematic diagram of the structure of an embodiment of the coal seam target geological structure identification device in this application.

[0068] Explanation of icon numbers:

[0069] 10. Memory; 20. Processor.

[0070] The functional features and advantages of this application will be further explained in conjunction with embodiments and accompanying drawings. Detailed Implementation

[0071] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0072] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0073] Example 1

[0074] This application provides an embodiment of a method for identifying the geological structure of coal seams, comprising the following steps:

[0075] Step S1: Obtain the measured data of the cross-layer borehole of the target longwall face, and obtain the strike azimuth, dip azimuth and true dip angle of the target coal seam;

[0076] Step S2: Preprocess the measured data of the cross-layer borehole. Based on the preprocessed measured data of the cross-layer borehole, obtain the three-dimensional coordinates of the coal entry point, the three-dimensional coordinates of the coal exit point, and the true thickness of the coal seam corresponding to the cross-layer borehole.

[0077] Step S3: Using any effective cross-layer borehole in the target mining face as the central cross-layer borehole, construct a pre-sized square nine-grid analysis window with the strike azimuth and dip azimuth as the direction reference. Within the square nine-grid analysis window, determine 8 effective cross-layer boreholes evenly distributed around the central cross-layer borehole as peripheral cross-layer boreholes to obtain the nine-grid analysis group.

[0078] Step S4: Based on the preset coal seam thickness difference threshold and the true coal seam thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, select target cross-layer boreholes with stable coal seam thickness.

[0079] Step S5: Using the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establish the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitute the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole.

[0080] Step S6: Based on the three-dimensional coordinates of the coal extraction point and the preset elevation deviation threshold, according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, obtain the regional coal seam target geological structure identification results between the central cross-layer borehole and the target cross-layer borehole.

[0081] Step S7: Slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained regional coal seam target geological structure identification results to obtain the full-area coal seam target geological structure identification results of the target mining face.

[0082] In this embodiment, the target mining face is the complete coal seam working face to be mined underground in a coal mine;

[0083] The target coal seam is the coal seam to be mined within the target longwall face, and its spatial occurrence is uniquely determined by the strike azimuth, dip azimuth, and true dip angle.

[0084] Cross-layer drilling is an underground drilling operation carried out in coal mines for gas extraction, which involves drilling through the roadway and completely penetrating the roof and floor of the target coal seam.

[0085] Effective cross-strata boreholes are cross-strata boreholes that meet the specified requirements of the target longwall mining face;

[0086] The three-dimensional coordinates of the coal entry point are the three-dimensional coordinates of the point where the axis of the cross-layer borehole penetrates the roof of the target coal seam;

[0087] The three-dimensional coordinates of the coal extraction point are the three-dimensional coordinates of the point where the axis of the cross-layer borehole penetrates the bottom plate of the target coal seam;

[0088] The true thickness of a coal seam is the normal thickness perpendicular to the top and bottom plates of the target coal seam, and it is the only legally recognized thickness measurement value in the field of coal mine geology.

[0089] The square nine-grid analysis window is the preset smallest analysis unit, a square area with the plane coordinates of the central borehole coal entry point as the geometric center and four sides parallel to the strike and dip of the coal seam.

[0090] In one optional implementation, the measured data from the cross-layer drilling includes:

[0091] Unique identifier for cross-layer boreholes, segmented inclination data of cross-layer boreholes, measured coal entry depth of cross-layer boreholes, measured coal extraction depth of cross-layer boreholes, coal core recovery rate of cross-layer boreholes, as-built design deviation data of cross-layer boreholes, on-site measured effective gas extraction radius of cross-layer boreholes, and relative position data of cross-layer borehole plane coordinates to the target longwall face.

[0092] Specifically, in this embodiment, the target longwall face has a strike length of 500m and a dip length of 300m. The target coal seam is No. 2 coal seam, and the core occurrence parameters include a strike azimuth δ of 315°, a dip azimuth 45°, and a true dip angle γ of 8°. The average true thickness of the coal seam is 3.2m, which is a near-horizontal medium-thick coal seam. A total of 85 gas drainage boreholes were drilled in the longwall face, with an average spacing of 5m between the boreholes.

[0093] In this embodiment, complete measured data of 85 cross-layer boreholes in 8 categories were extracted from the mine geological survey completion ledger, gas control test report, and borehole completion acceptance documents:

[0094] A unique identifier for a cross-layer borehole, including the borehole number and the three-dimensional coordinates of the opening point;

[0095] The data obtained from the segmented inclination measurement of the cross-layer borehole includes the inclination depth, the measured true dip angle, and the measured coordinate azimuth angle.

[0096] Measured depth of coal penetration in cross-strata boreholes;

[0097] The actual depth of coal seam reached by cross-strata drilling;

[0098] Coal core recovery rate from cross-strata drilling;

[0099] As-built design deviation data for cross-layer drilling includes azimuth deviation, dip angle deviation, and hole depth deviation;

[0100] The effective gas extraction radius was measured on-site during cross-layer drilling.

[0101] The relative position data of the planar coordinates of the cross-layer borehole and the target longwall face;

[0102] At the same time, the three core occurrence parameters of the target coal seam—strike azimuth, dip azimuth, and true dip angle—are obtained from the official geological report of the working face.

[0103] Using this implementation method, the basic data required for the entire process analysis can be obtained completely. All data comes from the mine's official completion documents, providing a reliable data source for subsequent analysis.

[0104] Further, step S2 includes:

[0105] The measured data from the cross-layer borehole were cleaned and standardized.

[0106] Based on the unique identifier of the cross-layer borehole and the segmented inclination measurement data of the cross-layer borehole, the spatial trajectory of the entire cross-layer borehole is calculated using the radius of curvature method.

[0107] Based on the measured coal entry depth and measured coal exit depth, and based on the entire spatial trajectory, the three-dimensional coordinates of the coal entry point and the three-dimensional coordinates of the coal exit point are obtained by linear interpolation.

[0108] The apparent thickness of the coal seam is obtained by the difference between the measured depth of coal entry and the measured depth of coal exit. The true thickness of the coal seam is obtained by combining the corrected angle between the axis of the cross-layer borehole and the normal of the target coal seam. The corrected angle is determined by the segmented inclination data of the cross-layer borehole, the strike azimuth angle and the true dip angle of the target coal seam.

[0109] Specifically, in this embodiment, the cleaning of the measured data of the cross-layer boreholes includes: removing invalid boreholes whose planar projection exceeds the working face range based on the relative position data of the cross-layer borehole's planar coordinates and the target mining face; removing invalid boreholes with excessive construction deviations and coal core recovery rates <80% based on the cross-layer borehole core recovery rate and cross-layer borehole as-built design deviation data; and removing outliers in the cross-layer boreholes using the 3σ criterion and completing linear interpolation based on the cross-layer borehole segment-by-segment inclination measurement data, and uniformly converting all data into the mine's independent plane rectangular coordinate system format.

[0110] The expression for calculating the entire spatial trajectory of a cross-layer borehole using the radius of curvature method is as follows:

[0111]

[0112]

[0113]

[0114] Where ΔL is the depth difference between two adjacent inclinometer points. , The actual measured dip angle of the borehole at two adjacent inclination points. , The measured azimuth angles of the boreholes at two adjacent inclination points. , , This represents the coordinate increment between adjacent measurement segments;

[0115] By accumulating the coordinate increments, the three-dimensional coordinates of any depth in the borehole can be obtained. Furthermore, based on the measured coal entry depth and measured coal exit depth, and the entire spatial trajectory, the three-dimensional coordinates of the coal entry point and the three-dimensional coordinates of the coal exit point are obtained through linear interpolation.

[0116] The expression for calculating the true thickness of a coal seam is as follows:

[0117]

[0118]

[0119] Where Mz is the true thickness of the coal seam, Ms is the apparent thickness of the coal seam, θ is the corrected included angle, α is the measured true dip angle of the cross-layer borehole at the coal entry point, γ is the true dip angle of the target coal seam, β is the measured coordinate azimuth angle of the cross-layer borehole at the coal entry point, and δ is the strike azimuth angle of the target coal seam.

[0120] By employing this implementation method, the three-dimensional coordinates of the borehole entry point and exit point, as well as the true thickness of the coal seam, are accurately calculated through the cleaning and standardization of the raw data. This eliminates data distortion caused by construction errors and ensures the accuracy of subsequent analysis from the source.

[0121] Further, in an optional implementation, the method for constructing a pre-sized square nine-grid analysis window with the heading azimuth and dip azimuth as directional references in step S3 includes:

[0122] The product of the actual measured effective gas extraction radius of the cross-layer borehole and the preset input coefficient is used as the side length of the square nine-square grid analysis window;

[0123] Set the two sets of opposite sides of the square nine-square analysis window to be parallel to the strike and dip of the target coal seam, respectively;

[0124] Using the plane coordinates of the coal entry point of the central through-layer borehole as the geometric center of the window, a square nine-square grid analysis window is constructed.

[0125] In this embodiment, effective cross-layer boreholes are screened based on preset thresholds. The screening conditions are that the borehole completion azimuth / inclination deviation is ≤1°, the borehole depth deviation is ≤0.5m, the coal core recovery rate is ≥80%, and the planar projection is within the working face range.

[0126] The preset input coefficient is K=1.5, and the calculation window side length is D=R×K;

[0127] The four corner points and the midpoints of the four sides of the window are used as target points. Each point corresponds to an independent orientation. Only one effective cross-layer borehole closest to the point is selected as the surrounding cross-layer borehole for each orientation. The final output consists of a nine-square grid analysis group composed of one central cross-layer borehole and eight surrounding cross-layer boreholes.

[0128] This implementation method breaks down the original full comparison of the entire working face at a single entrance into a local comparison of 9 holes in a single window, reducing the computational workload of a single window by more than 90%, thus fundamentally solving the bottleneck of computational efficiency. At the same time, the window direction is completely matched with the coal seam occurrence direction, ensuring the consistency of the analysis benchmark.

[0129] Further, step S4 includes:

[0130] Calculate the arithmetic mean of the true coal seam thickness of all valid cross-layer boreholes in the nine-square grid analysis group, and use it as the benchmark value for coal seam thickness.

[0131] The absolute value of the difference between the true thickness of the coal seam from a single-penetration borehole and the reference value of the coal seam thickness is taken as the absolute deviation of the true thickness of the coal seam.

[0132] The ratio of the absolute deviation of the true thickness of the coal seam to the benchmark value of the coal seam thickness is used as the relative deviation of the true thickness of the coal seam.

[0133] Cross-seam boreholes whose relative deviation from the true thickness of the coal seam does not exceed a preset coal seam thickness difference threshold are selected as target cross-seam boreholes with stable coal seam thickness. The preset coal seam thickness difference threshold is set according to the thickness classification of the target coal seam.

[0134] Specifically, in this embodiment, the target cross-layer borehole with stable coal seam thickness is the borehole whose relative deviation of the true coal seam thickness is ≤ a preset coal seam thickness difference threshold. The threshold is 8% for thin coal seams, 10% for medium-thick coal seams, and 12% for thick coal seams.

[0135] By adopting this implementation method, non-tectonic interferences such as coal seam scour zones and primary thickness variations are eliminated, thereby reducing the misjudgment rate of subsequent target geological structure identification from the root.

[0136] Further, in an optional implementation, step S5 includes:

[0137] Using the three-dimensional coordinates of the coal entry point of the central cross-layer borehole as the known reference point of the coal seam spatial plane, and combining the strike azimuth and true dip angle of the target coal seam, the unit normal vector of the coal seam plane is determined, and the spatial plane equation of the target coal seam is established.

[0138] The spatial plane equation is transformed by elevation calculation. Substituting the plane coordinate components from the three-dimensional coordinates of the coal entry point of the target cross-layer borehole, the theoretical coal entry point elevation of the target cross-layer borehole is obtained. The expression for the theoretical coal entry point elevation is as follows:

[0139]

[0140] in, Let be the theoretical coal entry point elevation of the i-th target cross-layer borehole. The elevation component in the three-dimensional coordinates of the central cross-layer borehole coal entry point. Let be the difference in X-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. Let be the difference in Y-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. The strike azimuth of the target coal seam. The true dip angle of the target coal seam.

[0141] Specifically, establishing the spatial plane equation of the coal seam includes:

[0142] Using the three-dimensional coordinates (X0, Y0, Z0) of the coal seam entry point of the central cross-seam borehole as a known reference point, and combining the strike azimuth δ and true dip angle γ of the target coal seam, determine the unit normal vector of the coal seam plane. The spatial plane equation of the target coal seam is established as follows:

[0143]

[0144] By transforming the spatial plane equation through elevation calculation, the following formula is obtained for calculating the theoretical elevation of the coal entry point:

[0145]

[0146] By adopting this implementation method, a standardized coal seam elevation calculation model is established to provide a unique and reproducible quantitative benchmark for the elevation of the coal seam roof in non-structural areas. It can accurately capture subtle elevation changes at the level of 0.3m, providing a reliable benchmark for subsequent identification of target geological structures.

[0147] Further, in an optional implementation, the elevation deviation value includes an absolute elevation deviation value and a relative elevation deviation value, and the elevation deviation threshold includes an absolute elevation deviation threshold and a relative elevation deviation threshold. Step S6 includes:

[0148] The absolute value of the difference between the measured elevation component and the theoretical elevation of the coal entry point in the three-dimensional coordinates of the target cross-layer borehole is taken as the absolute elevation deviation value, and the ratio of the absolute elevation deviation value to the coal seam thickness benchmark value of the nine-square grid analysis group is taken as the relative elevation deviation value.

[0149] A target cross-layer borehole that simultaneously satisfies both an absolute elevation deviation value greater than or equal to an absolute elevation deviation threshold and a relative elevation deviation value greater than or equal to a relative elevation deviation threshold is considered a preliminary abnormal borehole.

[0150] Based on the spatial plane equation, the theoretical coal extraction point elevation corresponding to the preliminary abnormal borehole is calculated and compared with the measured elevation component in the three-dimensional coordinates of the coal extraction point corresponding to the preliminary abnormal borehole, so as to verify the consistency of roof and floor slippage and mark the preliminary abnormal borehole that passes the verification as a valid abnormal borehole.

[0151] When there are at least two valid anomalous boreholes in adjacent directions within the same nine-square grid analysis window, it is determined that there is a coal seam target geological structure between the central cross-layer borehole and the corresponding valid anomalous borehole, and the regional coal seam target geological structure identification results are obtained.

[0152] Specifically, in this embodiment, the preset absolute elevation deviation threshold is 0.3m, and the preset relative elevation deviation threshold is 30%.

[0153] By adopting this implementation method, the problem of misjudgment caused by single-hole construction error is completely solved by combining dual-control threshold progressive screening with top and bottom plate consistency verification, ensuring the accuracy of anomaly judgment and stably identifying hidden small target geological structures at the 0.3m level.

[0154] Specifically, in one optional implementation, the identification logic for the four target geological structures is as follows:

[0155] When the absolute deviation of the roof elevation and the absolute deviation of the floor elevation are both greater than or equal to the preset absolute deviation threshold, and the absolute value of the difference between the two is less than or equal to the preset allowable threshold for synchronous misalignment, the target geological structure of the coal seam is determined to be a fault.

[0156] When valid abnormal boreholes that meet the above fault determination conditions are continuously distributed in no less than 3 nine-square grid analysis windows along the strike or dip of the target coal seam, and the corresponding absolute elevation deviation values ​​show a continuous gradual change, the target geological structure of the coal seam is determined to be folded.

[0157] When the absolute deviation of the roof elevation is less than or equal to the preset allowable deviation threshold, the absolute deviation of the floor elevation is greater than or equal to the preset absolute deviation threshold, and the relative deviation of the true thickness of the coal seam in the corresponding borehole is greater than or equal to the preset thickness anomaly threshold, the target geological structure of the coal seam is determined to be the lower local thickening zone.

[0158] When the absolute deviation of the bottom plate elevation is less than or equal to the preset allowable deviation threshold, the absolute deviation of the top plate elevation is greater than or equal to the preset absolute deviation threshold, and the relative deviation of the true thickness of the coal seam in the corresponding borehole is greater than or equal to the preset thickness anomaly threshold, the target geological structure of the coal seam is determined to be an upper local thickening zone.

[0159] This implementation method enables precise differentiation and simultaneous identification of four types of target geological structures: faults, folds, lower local thickening zones, and upper local thickening zones. It clarifies the characteristic boundaries of different geological anomalies and completely solves the problem that traditional methods can only identify single faults and cannot distinguish coal seam occurrence anomaly types. While ensuring the identification accuracy of concealed structures at the 0.3m level, it significantly improves the distinguishability and accuracy of anomaly type identification. The output results can be directly adapted to the full-process field needs of mine excavation design, gas control, and intelligent mining geological modeling.

[0160] Further, in an optional implementation, step S7 includes:

[0161] Using the preset ratio of the side length of the square nine-square grid analysis window as the sliding step size, an S-shaped path is used to traverse the entire area of ​​the target mining face so that the overlap rate of adjacent windows is not lower than the preset overlap rate threshold.

[0162] The target longwall face is divided into grid units of equal size, and the identification results of the target geological structure of the coal seam in each grid unit are statistically analyzed by voting.

[0163] Based on the multi-window result voting fusion rule, grid cells that are determined to have target geological structures by a preset number or more analysis windows are identified as effective coal seam target geological structure areas, and the remaining grid cells are marked as suspected abnormal areas or areas without abnormalities.

[0164] Spatial fitting is performed on the effective coal seam target geological structure region, and the output is the full-area coal seam target geological structure identification result including the spatial location, occurrence and elevation of the target geological structure.

[0165] Specifically, a preset ratio of 1 / 3 of the window side length is used, and an S-shaped path is used to traverse the entire target mining face area, controlling the overlap rate of adjacent windows to be no less than 66%.

[0166] When conducting grid unit voting statistics, the target mining face is divided into 1m×1m equal-sized grid units, and the regional target geological structure identification results of each grid unit are voted on and statistically analyzed.

[0167] When performing multi-window voting fusion, the preset threshold is 3. If the same grid cell is identified as having a target geological structure by 3 or more analysis windows, it is confirmed as a valid coal seam target geological structure area; if it is identified as having a target geological structure by 1-2 windows, it is marked as a suspected anomaly area; if no window identifies it as having a target geological structure, it is marked as an area without anomalies.

[0168] Finally, spatial fitting is performed on the effective coal seam target geological structure area to output the full-area coal seam target geological structure identification results, which include the spatial location, occurrence, elevation difference, and influence range of the target geological structure.

[0169] This implementation method achieves full coverage scanning of the working face without blind spots, eliminates accidental misjudgments from single windows through multi-window voting fusion, and finally outputs highly reliable full-area target geological structure identification results, which can be directly connected to the mine geological survey system and intelligent mining platform.

[0170] Example 2

[0171] This embodiment provides an example of a coal seam target geological structure identification system, including:

[0172] The data acquisition module is used to execute step S1, acquire the measured data of the cross-layer borehole of the target longwall face, and acquire the strike azimuth, dip azimuth and true dip angle of the target coal seam;

[0173] The data preprocessing module is used to perform step S2, preprocess the measured data of the cross-layer borehole, and obtain the three-dimensional coordinates of the coal inlet point, the three-dimensional coordinates of the coal outlet point, and the true thickness of the coal seam based on the preprocessed measured data of the cross-layer borehole.

[0174] The analysis window construction module is used to execute step S3, taking any effective cross-layer borehole in the target mining face as the center cross-layer borehole, constructing a pre-sized square nine-square grid analysis window with the strike azimuth and dip azimuth as the direction reference, and determining 8 effective cross-layer boreholes evenly distributed around the center cross-layer borehole as the peripheral cross-layer boreholes within the square nine-square grid analysis window to obtain the nine-square grid analysis group.

[0175] The target cross-layer borehole screening module is used to perform step S4, based on the preset coal seam thickness difference threshold and the coal seam true thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, to screen out target cross-layer boreholes with stable coal seam thickness.

[0176] The theoretical coal entry point elevation calculation module is used to execute step S5, which uses the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establishes the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitutes the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole.

[0177] The regional coal seam target geological structure identification module is used to execute step S6, based on the three-dimensional coordinates of the coal outlet point and the preset elevation deviation threshold, and according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, to obtain the regional coal seam target geological structure identification result between the central cross-layer borehole and the target cross-layer borehole.

[0178] The whole-area coal seam target geological structure identification module is used to execute step S7, slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained sub-area coal seam target geological structure identification results to obtain the whole-area coal seam target geological structure identification results of the target mining face.

[0179] Example 3

[0180] This application provides a coal seam target geological structure identification device, the device comprising: a memory, a processor, and a coal seam target geological structure identification program stored in the memory and executable on the processor, the coal seam target geological structure identification program being configured to implement the steps of the method as described in any one of Embodiment 1.

[0181] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for identifying the geological structure of coal seams, characterized in that, To identify target geological structures including folds, faults, lower localized thickening zones, and upper localized thickening zones, the following steps are included: Step S1: Obtain the measured data of the cross-layer borehole of the target longwall face, and obtain the strike azimuth, dip azimuth and true dip angle of the target coal seam; Step S2: Preprocess the measured data of the cross-layer borehole. Based on the preprocessed measured data of the cross-layer borehole, obtain the three-dimensional coordinates of the coal entry point, the three-dimensional coordinates of the coal exit point, and the true thickness of the coal seam corresponding to the cross-layer borehole. Step S3: Using any effective cross-layer borehole in the target mining face as the central cross-layer borehole, construct a pre-sized square nine-grid analysis window with the strike azimuth and dip azimuth as the direction reference. Within the square nine-grid analysis window, determine 8 effective cross-layer boreholes evenly distributed around the central cross-layer borehole as peripheral cross-layer boreholes to obtain the nine-grid analysis group. Step S4: Based on the preset coal seam thickness difference threshold and the true coal seam thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, select target cross-layer boreholes with stable coal seam thickness. Step S5: Using the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establish the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitute the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole. Step S6: Based on the three-dimensional coordinates of the coal extraction point and the preset elevation deviation threshold, according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, obtain the regional coal seam target geological structure identification results between the central cross-layer borehole and the target cross-layer borehole. Step S7: Slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained regional coal seam target geological structure identification results to obtain the full-area coal seam target geological structure identification results of the target mining face.

2. The method for identifying the geological structure of coal seams as described in claim 1, characterized in that, The measured data of the cross-layer drilling includes: Unique identifier for cross-layer boreholes, segmented inclination data of cross-layer boreholes, measured coal entry depth of cross-layer boreholes, measured coal extraction depth of cross-layer boreholes, coal core recovery rate of cross-layer boreholes, as-built design deviation data of cross-layer boreholes, on-site measured effective gas extraction radius of cross-layer boreholes, and relative position data of cross-layer borehole plane coordinates to the target longwall face.

3. The method for identifying the geological structure of coal seams as described in claim 2, characterized in that, Step S2 includes: The measured data from the cross-layer borehole were cleaned and standardized. Based on the unique identifier of the cross-layer borehole and the segmented inclination measurement data of the cross-layer borehole, the spatial trajectory of the entire cross-layer borehole is calculated using the radius of curvature method. Based on the measured coal entry depth and measured coal exit depth, and based on the entire spatial trajectory, the three-dimensional coordinates of the coal entry point and the three-dimensional coordinates of the coal exit point are obtained by linear interpolation. The apparent thickness of the coal seam is obtained by the difference between the measured depth of coal entry and the measured depth of coal exit. The true thickness of the coal seam is obtained by combining the corrected angle between the axis of the cross-layer borehole and the normal of the target coal seam. The corrected angle is determined by the segmented inclination data of the cross-layer borehole, the strike azimuth angle and the true dip angle of the target coal seam.

4. The method for identifying the geological structure of coal seams as described in claim 3, characterized in that, In step S3, the method for constructing a pre-sized square nine-grid analysis window with the heading azimuth and dip azimuth as directional references includes: The product of the actual measured effective gas extraction radius of the cross-layer borehole and the preset input coefficient is used as the side length of the square nine-square grid analysis window; Set the two sets of opposite sides of the square nine-square analysis window to be parallel to the strike and dip of the target coal seam, respectively; Using the plane coordinates of the coal entry point of the central through-layer borehole as the geometric center of the window, a square nine-square grid analysis window is constructed.

5. The method for identifying the geological structure of coal seams as described in claim 1, characterized in that, Step S4 includes: Calculate the arithmetic mean of the true coal seam thickness of all valid cross-layer boreholes in the nine-square grid analysis group, and use it as the benchmark value for coal seam thickness. The absolute value of the difference between the true thickness of the coal seam from a single-penetration borehole and the reference value of the coal seam thickness is taken as the absolute deviation of the true thickness of the coal seam. The ratio of the absolute deviation of the true thickness of the coal seam to the benchmark value of the coal seam thickness is used as the relative deviation of the true thickness of the coal seam. Cross-seam boreholes whose relative deviation from the true thickness of the coal seam does not exceed a preset coal seam thickness difference threshold are selected as target cross-seam boreholes with stable coal seam thickness. The preset coal seam thickness difference threshold is set according to the thickness classification of the target coal seam.

6. The method for identifying the geological structure of coal seams as described in claim 1, characterized in that, Step S5 includes: Using the three-dimensional coordinates of the coal entry point of the central cross-layer borehole as the known reference point of the coal seam spatial plane, and combining the strike azimuth and true dip angle of the target coal seam, the unit normal vector of the coal seam plane is determined, and the spatial plane equation of the target coal seam is established. The spatial plane equation is transformed by elevation calculation. Substituting the plane coordinate components from the three-dimensional coordinates of the coal entry point of the target cross-layer borehole, the theoretical coal entry point elevation of the target cross-layer borehole is obtained. The expression for the theoretical coal entry point elevation is as follows: in, Let be the theoretical coal entry point elevation of the i-th target cross-layer borehole. The elevation component in the three-dimensional coordinates of the central cross-layer borehole coal entry point. Let be the difference in X-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. Let be the difference in Y-axis coordinate between the i-th target cross-layer borehole and the central cross-layer borehole. The strike azimuth of the target coal seam. The true dip angle of the target coal seam.

7. The method for identifying the geological structure of coal seams as described in claim 6, characterized in that, Elevation deviation values ​​include absolute elevation deviation values ​​and relative elevation deviation values; elevation deviation thresholds include absolute elevation deviation thresholds and relative elevation deviation thresholds; step S6 includes: The absolute value of the difference between the measured elevation component and the theoretical elevation of the coal entry point in the three-dimensional coordinates of the target cross-layer borehole is taken as the absolute elevation deviation value, and the ratio of the absolute elevation deviation value to the coal seam thickness benchmark value of the nine-square grid analysis group is taken as the relative elevation deviation value. A target cross-layer borehole that simultaneously satisfies both an absolute elevation deviation value greater than or equal to an absolute elevation deviation threshold and a relative elevation deviation value greater than or equal to a relative elevation deviation threshold is considered a preliminary abnormal borehole. Based on the spatial plane equation, the theoretical coal extraction point elevation corresponding to the preliminary abnormal borehole is calculated and compared with the measured elevation component in the three-dimensional coordinates of the coal extraction point corresponding to the preliminary abnormal borehole, so as to verify the consistency of roof and floor slippage and mark the preliminary abnormal borehole that passes the verification as a valid abnormal borehole. When there are at least two valid anomalous boreholes in adjacent directions within the same nine-square grid analysis window, it is determined that there is a coal seam target geological structure between the central cross-layer borehole and the corresponding valid anomalous borehole, and the regional coal seam target geological structure identification results are obtained.

8. The method for identifying the geological structure of coal seams as described in claim 1, characterized in that, Step S7 includes: Using the preset ratio of the side length of the square nine-square grid analysis window as the sliding step size, an S-shaped path is used to traverse the entire area of ​​the target mining face so that the overlap rate of adjacent windows is not lower than the preset overlap rate threshold. The target longwall face is divided into grid units of equal size, and the identification results of the target geological structure of the coal seam in each grid unit are statistically analyzed by voting. Based on the multi-window result voting fusion rule, grid cells that are determined to have target geological structures by a preset number or more analysis windows are identified as effective coal seam target geological structure areas, and the remaining grid cells are marked as suspected abnormal areas or areas without abnormalities. Spatial fitting is performed on the effective coal seam target geological structure region, and the output is the full-area coal seam target geological structure identification result including the spatial location, occurrence and elevation of the target geological structure.

9. A coal seam target geological structure identification system, characterized in that, include: The data acquisition module is used to execute step S1, acquire the measured data of the cross-layer borehole of the target longwall face, and acquire the strike azimuth, dip azimuth and true dip angle of the target coal seam; The data preprocessing module is used to perform step S2, preprocess the measured data of the cross-layer borehole, and obtain the three-dimensional coordinates of the coal inlet point, the three-dimensional coordinates of the coal outlet point, and the true thickness of the coal seam based on the preprocessed measured data of the cross-layer borehole. The analysis window construction module is used to execute step S3, taking any effective cross-layer borehole in the target mining face as the center cross-layer borehole, constructing a pre-sized square nine-square grid analysis window with the strike azimuth and dip azimuth as the direction reference, and determining 8 effective cross-layer boreholes evenly distributed around the center cross-layer borehole as the peripheral cross-layer boreholes within the square nine-square grid analysis window to obtain the nine-square grid analysis group. The target cross-layer borehole screening module is used to perform step S4, based on the preset coal seam thickness difference threshold and the coal seam true thickness deviation corresponding to each effective cross-layer borehole in the nine-square grid analysis group, to screen out target cross-layer boreholes with stable coal seam thickness. The theoretical coal entry point elevation calculation module is used to execute step S5, which uses the three-dimensional coordinates of the coal entry point corresponding to the central cross-layer borehole as the reference point, establishes the spatial plane equation of the target coal seam based on the strike azimuth and true dip angle, and substitutes the plane coordinate components in the three-dimensional coordinates of the coal entry points of the surrounding cross-layer boreholes to obtain the theoretical coal entry point elevation of the target cross-layer borehole. The regional coal seam target geological structure identification module is used to execute step S6, based on the three-dimensional coordinates of the coal outlet point and the preset elevation deviation threshold, and according to the elevation deviation value between the measured elevation component in the three-dimensional coordinates of the coal entry point corresponding to the target cross-layer borehole and the theoretical coal entry point elevation, to obtain the regional coal seam target geological structure identification result between the central cross-layer borehole and the target cross-layer borehole. The whole-area coal seam target geological structure identification module is used to execute step S7, slide the square nine-square grid analysis window according to the preset step size, repeat steps S2 to S6, and perform multi-window result voting fusion on all the obtained sub-area coal seam target geological structure identification results to obtain the whole-area coal seam target geological structure identification results of the target mining face.

10. A device for identifying the geological structure of a coal seam target, characterized in that, The apparatus includes: a memory, a processor, and a coal seam target geological structure identification program stored in the memory and executable on the processor, the coal seam target geological structure identification program being configured to implement the steps of the method as described in any one of claims 1 to 8.

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