Method for identifying thickened zone of coal seam based on layer-crossing drilling information

Abstract

According to the method for identifying the thickened zone of the coal seam based on the layer-crossing drilling information, the scattered information is collected into a unified layer-crossing drilling information table through systematic arrangement of construction machine account data, and the accuracy of drilling coordinates is ensured and the trueness of a model is improved by using a specific mine plane graph and a specific mine profile graph; a series of coal seeing point and coal outlet point parameters are calculated through a mathematical algorithm, threshold values are set, areas with coal seam thickening zones are judged and sorted, the screening difficulty of small structures is lowered, and a mine gas treatment scheme is rapidly formulated.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine reserve prediction, and in particular to a method for identifying a coal seam thickening zone based on through-layer drilling information. Background Art

[0002] With the in-depth promotion and application of intelligent and unmanned mining technology in my country's working face, the construction of smart mines is an inevitable trend in the future development of coal mines, and intelligent mining is a new stage in the development of comprehensive mechanization of coal. Constructing an accurate three-dimensional model of coal seams is one of the key technologies to achieve intelligent mining. At present, the construction of the initial model of coal seams is mainly based on data such as drilling, three-dimensional seismic, slot wave CT and three-dimensional scanning of tunnels. It is subject to the influence of various factors such as the number of source data, source data processing, and interpolation method selection. As a result, the initial three-dimensional model of coal seams constructed using these data is inaccurate, the vertical resolution is low, and the error is generally large.

[0003] At present, there are three commonly used methods for measuring coal thickness underground: underground drilling detection, transmission slot wave detection, and ground penetrating radar detection. For transmission slot wave detection of coal thickness, when the coal thickness changes greatly, the selected tomography frequency begins to decrease relative to the coal thickness resolution, and the error of slot wave detection will be larger. For radar detection, in the radar grayscale image, the direct wave at the boundary between the air and the coal seam is more obvious, but the boundary between the coal seam and the rock layer is not obvious, which limits the application of radar technology in coal seam thickness measurement. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for identifying coal seam thickening zones based on through-layer drilling information. By collecting through-layer drilling information and performing data preprocessing on the drilling information, and then setting thresholds after calculating the parameters of coal seeing points and coal output points, the method can judge and sort out the areas with coal seam thickening zones, reduce the difficulty of identifying small structures, and quickly formulate mine gas control plans.

[0005] The object of the present invention is achieved in that: A method for identifying a coal seam thickening zone based on through-layer drilling information includes the following contents: S1. Arrange and clean the drilling data of the bottom extraction tunnel and the interlayer of the mine; Collect the mine's record sheets, remove the incomplete drilling data, and organize the data of each drilling hole's angle, inclination, coal and rock conditions, and coal penetration length into a list; S2. Set the underground three-dimensional coordinate system and calculate the X, Y, and Z coordinates of each drilling point, with the north direction as the azimuth angle 0°, the azimuth angle range 0~360°, the horizontal direction as the inclination angle 0°, and the inclination angle range -90~90°; S3, calculate the coordinates X1, Y1, and Z1 of the coal point by combining the inclination angle and azimuth angle; S4, calculate the coal point coordinates X2, Y2, and Z2 by combining the inclination angle and azimuth angle; S5. All coal-viewing points are recorded as set 1, and all coal-discharging points are recorded as set 2; the projection distance between each point in set 1 and other points on the XOY plane is measured, which is recorded as L1; similarly, each pair of coal-discharging points corresponding to each pair of coal-viewing points is measured, and the projection distance L2 of each pair of coal-discharging points in set 2 on the XOY plane is measured; S6. According to the distance of the borehole layout, set the radius threshold P1, P1 = (1.2-1.5) × the borehole spacing; then select each pair of coal points that meet L1<P1; S7, calculate the height difference ΔZ1 of each pair of coal points, find ΔZ1 / L1, and record it as K1; S8, calculate the height difference ΔZ2 of each pair of coal outlet points, and find ΔZ2 / L2, which is recorded as K2; S9, record |K1-K2| as M1, set the threshold P2 according to the height difference of the thickening zone of the coal seam, the radius threshold and other parameters, P2 = thickness difference of the thickening zone of the coal seam / search radius P1; record and output each pair of coal output points where M1>P2; S10. Each pair of coal points outputted in the above step S9 is a coal seam thickening zone between the two borehole sections, thereby obtaining a situation in which the coal seam thickening exists in the middle area between the two boreholes.

[0006] Preferably, the X coordinate of the borehole in step S2 can be obtained from the mining plan of the mine working face, and the X obtained from the plan is the actual X coordinate of the borehole.

[0007] Preferably, the Y coordinate of the borehole in step S2 can be obtained from the profile diagram of each borehole in the working face of the mine.

[0008] Preferably, the Z coordinate of the borehole in step S2 can be obtained from the profile diagrams of each borehole in the working face of the mine, and then the Z coordinate is corrected by the schematic diagram of the central axis of the tunnel to obtain the real Z coordinate of the borehole.

[0009] Preferably, in step S3, X1=X+coal length×|cos inclination|×cos azimuth, Y1=Y+coal length×|cos inclination|×sin azimuth, and Z1=Z+coal length×sin azimuth.

[0010] Preferably, in step S4, X2=X+coal output length×|cos inclination|×cos azimuth, Y2=Y+coal output length×|cos inclination|×sin azimuth, and Z2=Z+coal output length×sin azimuth.

[0011] Preferably, in step S9, for thin coal seams with a thickness of less than 1.3 meters, a thickness difference of 1 meter is considered as a thickening zone of the coal seam, and P2 is set to 0.1.

[0012] Preferably, in step S9, for a medium-thick coal seam with a thickness of 1.3 to 3.5 meters, a thickness difference of 1.5 meters is considered as a thickening zone of the coal seam, and P2 is set to 0.15.

[0013] Preferably, in step S9, for a thick coal seam with a thickness of 3.5 to 10 meters, a thickness difference of 2 meters is considered as a thickening zone of the coal seam, and P2 is set to 0.2.

[0014] Preferably, after calculating the X, Y, and Z coordinates of each drilling point in step S2, the hole depth and the coal-visible section are sorted, and each section is classified. Taking 0-82.5 rock-98.2 coal-100 rock as an example, 82.5~98.2 is the coal-visible section, and the rest are rock sections. 82.5 is the coal-visible length, and 98.2 is the coal-exporting length.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention establishes a mathematical model based on the drilling data through preprocessing, reflects the potential coal seam thickening zone through a high-precision calculation model, identifies and reveals the sudden change of coal thickness in the coal seam, rationally designs the construction plan, achieves one-time treatment success, and reduces the amount of engineering work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a plan view of the mining face of a mine according to Example 1 of the present invention.

[0017] Figure 2 This is a cross-sectional view of each drill hole in the mine working face of Example 1 of the present invention.

[0018] Figure 3 This is a schematic diagram of the central axis of the laneway of Example 1 of the present invention. DETAILED DESCRIPTION

[0019] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0020] See also Figure 1-Figure 3 , Figure 1 A mining plan of the mine working face of Example 1 is drawn. As shown in the figure, a method for identifying a coal seam thickening zone based on through-layer drilling information in Example 1 specifically includes the following contents: S1, collecting through-layer drilling data; S1.1. Collect the construction records of bottom extraction tunnel drilling in the coal mine with thickening zone of coal seam to be identified. The data of each drilling hole are as shown in Table 1:

[0021] S1.2. Collect the X coordinate of the borehole. The X coordinate of the borehole can be obtained from the mining plan of the mine working face. The X obtained on the plan is the actual X coordinate of the borehole. S1.3, collect the Y coordinate of the borehole. The Y coordinate of the borehole can be obtained from the profile of each borehole of the mine working face. From the mining plan of the working face, it can be known that the mine tunnel is on a horizontal straight line. Therefore, the mine working face is located on the same XOY plane in space, so the Y coordinate of the borehole does not need to be corrected; S1.4, collect the Z coordinate of the borehole, the Z coordinate of the borehole can be obtained from the profile of each borehole in the working face of the mine, and then the Z coordinate is corrected by the central axis diagram of the tunnel, that is, the real Z coordinate of the borehole is obtained; S1.5. Calculate the coordinates X1, Y1, and Z1 of the coal point by combining the inclination angle and azimuth angle; X1=X+coal length×|cos inclination|×cos azimuth, Y1=Y+coal length×|cos inclination|×sin azimuth, Z1=Z+coal length×sin azimuth; S1.6. Calculate the coordinates X2, Y2, and Z2 of the coal output point by combining the inclination angle and azimuth angle; X2=X+coal output length×|cos inclination|×cos azimuth, Y2=Y+coal output length×|cos inclination|×sin azimuth, Z2=Z+coal output length×sin azimuth; S1.7. List the through-layer drilling data table 2. According to the data in the above table 1 and the coordinates of the drilling hole, the coal point, and the coal output point, the through-layer drilling data table 2 is sorted out (except the drilling hole coordinates X, Y, and Z in Table 2, which can be obtained from Table 1). The through-layer drilling data table is shown in Table 2 below:

[0022] S2, record all coal-viewing points as set 1, and all coal-discharging points as set 2; measure the projection distance between each point in set 1 and other points on the XOY plane, which is recorded as L1; similarly, measure each pair of coal-discharging points corresponding to each pair of coal-viewing points, and measure the projection distance L2 of each pair of coal-discharging points in set 2 on the XOY plane; S3. According to the distance of drilling holes, set the radius threshold P1, P1=1.2×drilling hole spacing. In order to avoid the error caused by the drilling hole position during the construction process, the P1 value can be increased, and the maximum value of P1 does not exceed 1.5×drilling hole spacing; then select each pair of coal points that meet L1<P1; S4, calculate the height difference ΔZ1 of each pair of coal points, find ΔZ1 / L1, and record it as K1; S5, calculate the height difference ΔZ2 of each pair of coal outlet points, and find ΔZ2 / L2, which is recorded as K2; S6, |K1-K2| is recorded as M1, and according to the parameters such as the height difference of the thickening zone of the coal seam and the radius threshold, the threshold P2 is set, where P2=thickness difference of the thickening zone of the coal seam / search radius P1; S6.1. For thin coal seams (thickness less than 1.3 meters), a thickness difference of 1 meter can be considered as a thickening zone of the coal seam, and P2 is set to 0.1; S6.2, for medium-thick coal seams (thickness of 1.3 to 3.5 meters), the thickness difference of 1.5 meters can be considered as the thickening zone of the coal seam, and P2 is set to 0.15; S6.3. For thick coal seams (thickness of 3.5 to 10 meters), the 2-meter thickness difference can be considered as the thickening zone of the coal seam, and P2 is set to 0.2; S6.4, finally record and output each pair of coal outlet points where M1>P2; S7. The contents of steps S2 to S6 are implemented in the algorithm software. Each pair of coal points outputted is a coal seam thickening zone between the two borehole sections, thereby obtaining the situation in which the coal seam thickening exists in the middle area between the two boreholes.

[0023] In this embodiment, Python algorithm software is used for input calculation.

[0024] In this embodiment, the mine is divided into two areas, large holes and small holes. Since the drilling spacing in the large hole area is 10 meters on the plan view, the radius threshold P1 in step eight is set to 12 meters; the drilling spacing in the small hole area is 2.5 meters on the plan view, so the radius threshold P1 in step eight is set to 4 meters, and the threshold P2 in step eleven is uniformly set to 0.20.

[0025] In this embodiment, the coal seam thickening zone is identified for 1924 borehole data of the bottom extraction lane of a certain mine working face. Through the above steps, a series of thresholds are set, and finally the coal seam thickening zone is detected between 146 pairs of boreholes, as shown in the following Table 3, where Line and Line2 represent the output borehole numbers, Δz represents the height difference between the two boreholes, and the area between the borehole pairs in each output row is the coal seam thickening zone.

[0026]

[0027] Working principle: The present invention provides a method for identifying a coal seam thickening zone based on through-layer drilling information. First, the drilling data is extracted from the construction ledger and organized into a through-layer drilling information table, including the X, Y, and Z coordinates of the drilling hole; the X coordinate is directly obtained from the mining plan of the mine working face, the Y coordinate does not need to be corrected because the tunnel is located on the same horizontal plane, and the Z coordinate is corrected by the cross-sectional view and the schematic diagram of the tunnel center axis; then, the inclination and azimuth are used to calculate the coordinates of the coal point and the coal output point, and these points are divided into two sets; by measuring the projection distance of the midpoint of the set on the XOY plane, and setting the radius threshold P1, the coal point pairs that meet the conditions are screened out; then, the ratio K1 of the height difference of each pair of coal points to the horizontal distance, and the corresponding K2 of the coal output point are calculated; by comparing the difference M1 of K1 and K2, and setting the threshold P2, the area where the coal seam thickens is finally determined. The above-mentioned calculation method of the present invention can be implemented by algorithm software, effectively identifying the thickening area of ​​the coal seam, and providing key geological information for coal mining.

[0028] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A method for identifying coal seam thickening zones based on through-layer drilling information, characterized in that: Includes the following: S1. Arrange and clean the drilling data of the bottom extraction tunnel and the interlayer of the mine; Collect the mine's record sheets, remove the incomplete drilling data, and organize the angle, inclination, coal and rock conditions, and coal penetration length of each drilling hole into a list; S2. Set the underground three-dimensional coordinate system and calculate the X, Y, and Z coordinates of each drilling point, with the north direction as the azimuth angle 0°, the azimuth angle range 0~360°, the horizontal direction as the inclination angle 0°, and the inclination angle range -90~90°; S3, calculate the coordinates X1, Y1, and Z1 of the coal point by combining the inclination angle and azimuth angle; S4, calculate the coal point coordinates X2, Y2, and Z2 by combining the inclination angle and azimuth angle; S5. All coal-viewing points are recorded as set 1, and all coal-discharging points are recorded as set 2; the projection distance between each point in set 1 and other points on the XOY plane is measured, which is recorded as L1; similarly, each pair of coal-discharging points corresponding to each pair of coal-viewing points is measured, and the projection distance L2 of each pair of coal-discharging points in set 2 on the XOY plane is measured; S6. According to the distance of the borehole layout, set the radius threshold P1, P1 = (1.2-1.5) × the borehole spacing; then select each pair of coal points that meet L1<P1; S7, calculate the height difference ΔZ1 of each pair of coal points, find ΔZ1 / L1, and record it as K1; S8, calculate the height difference ΔZ2 of each pair of coal outlet points, and find ΔZ2 / L2, which is recorded as K2; S9, record |K1-K2| as M1, set the threshold P2 according to the height difference of the thickening zone of the coal seam, the radius threshold and other parameters, P2 = thickness difference of the thickening zone of the coal seam / search radius P1; record and output each pair of coal output points where M1>P2; S10. Each pair of coal points outputted in the above step S9 is a coal seam thickening zone between the two borehole sections, thereby obtaining a situation in which the coal seam thickening exists in the middle area between the two boreholes.

2. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: The X coordinate of the borehole in step S2 can be obtained from the mining plan of the mine working face, and the X obtained in the plan is the actual X coordinate of the borehole.

3. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: The Y coordinate of the borehole in step S2 can be obtained from the profile diagrams of each borehole in the working face of the mine.

4. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: The Z coordinate of the borehole in step S2 can be obtained from the profiles of the boreholes in the working face of the mine, and then the Z coordinate is corrected by the central axis diagram of the tunnel to obtain the real Z coordinate of the borehole.

5. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: In step S3, X1=X+coal length×|cos inclination|×cos azimuth, Y1=Y+coal length×|cos inclination|×sin azimuth, and Z1=Z+coal length×sin azimuth.

6. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: In step S4, X2=X+coal output length×|cos inclination|×cos azimuth, Y2=Y+coal output length×|cos inclination|×sin azimuth, and Z2=Z+coal output length×sin azimuth.

7. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized by: In step S9, for thin coal seams with a thickness of less than 1.3 meters, a thickness difference of 1 meter is considered as a thickening zone of the coal seam, and P2 is set to 0.

1.

8. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized by: In step S9, for the medium-thick coal seam with a thickness of 1.3 to 3.5 meters, the thickness difference of 1.5 meters is considered as the thickening zone of the coal seam, and P2 is set to 0.

15.

9. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1 is characterized in that: In step S9, for thick coal seams with a thickness of 3.5 to 10 meters, a thickness difference of 2 meters is considered as a thickening zone of the coal seam, and P2 is set to 0.

2.

10. The method for identifying coal seam thickening zones based on through-layer drilling information according to claim 1, characterized in that: After calculating the X, Y, and Z coordinates of each drilling point in step S2, the hole depth and the coal-visible section are sorted, and each section is classified. Taking 0-82.5 rock-98.2 coal-100 rock as an example, 82.5~98.2 is the coal-visible section, and the rest are rock sections. 82.5 is the coal-visible length, and 98.2 is the coal-exporting length.

Images