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A Fast and Accurate Method for Detecting Coal-rock Boundary

A coal-rock boundary and coal-rock layer technology is applied in the field of rapid and accurate detection of coal-rock layer boundaries, which can solve the problems of high labor and material cost, long time required for drilling detection, inaccurate detection, etc., and achieves continuous testing, testing workload and The effect of reducing construction costs

Active Publication Date: 2021-12-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method for fast and accurate detection of the boundary of coal and rock strata to solve the technical problems of inaccurate detection, long drilling time and high cost of manpower and material resources in the prior art

Method used

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  • A Fast and Accurate Method for Detecting Coal-rock Boundary
  • A Fast and Accurate Method for Detecting Coal-rock Boundary
  • A Fast and Accurate Method for Detecting Coal-rock Boundary

Examples

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no. 1 example

[0050] This embodiment utilizes the advantages of the direct current method for area detection to provide a method for quickly and accurately detecting the boundary of coal and rock layers, which is suitable for accurate determination of the position of the coal seam before mining the coal seam or when gas is extracted through the seam. The execution flow of the method for fast and accurate detection of coal-rock boundary is as follows: figure 1 shown, including the following steps:

[0051] S101, acquiring a coal core sample in an area to be detected by a drilling method.

[0052] Specifically, for the above steps, in this embodiment, according to the layout of the roof and floor roadways in the area to be detected, the bottom extraction roadway under the coal seam is selected as the test site; Drilling: obtaining coal core samples in the area to be detected through the through-bed drilling. Wherein, the length of the through-bed drilling is more than 20cm longer than the u...

no. 2 example

[0066] see figure 2 and image 3 , this embodiment provides a method for quickly and accurately detecting the boundary of coal and rock layers, which is suitable for accurately determining the position of the coal seam before mining the coal seam or during gas extraction through the seam. The method includes: constructing a layer-penetrating drilling hole on the roof of the bottom pumping roadway; taking cores to test the thickness and resistivity of the coal and rock formations, establishing a numerical model of the coal and rock strata, and performing forward simulation calculation of the apparent resistivity; obtaining the apparent resistivity of the bottom pumping roadway roof. Resistivity distribution map, combined with coring measurement, forward modeling and bottom roadway electrical test results, determine the boundary line of coal and rock layers within the test range; and obtain the boundary line of coal and rock layers in all areas to be tested by moving the electr...

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Abstract

The invention discloses a method for quickly and accurately detecting the boundaries of coal and rock layers, comprising: obtaining a coal core sample in an area to be detected by a drilling method; measuring the thickness and resistivity of each structural layer at the drill hole through the coal core sample ;Establish the geometric model of the coal-rock layer according to the thickness and resistivity of each structural layer; carry out forward simulation calculation on the geometric model of the coal-rock layer to determine the apparent resistivity of the coal-rock boundary point; obtain the apparent resistivity distribution map of each structural layer in the area to be detected ; Based on the apparent resistivity of the coal-rock boundary point determined by the forward modeling calculation and the measurement results of the thickness of the structural layer, according to the obtained apparent resistivity distribution map of each structural layer in the area to be detected, determine the boundary line of the coal-rock layer in the area to be detected. The invention utilizes the differences in the resistivity of different media to quickly detect the coal-rock boundary, and combines coring and forward modeling conclusions to obtain the precise position of the coal-rock boundary, which solves the problems of long time consumption and large errors in existing drilling methods.

Description

technical field [0001] The invention relates to the technical field of geophysical detection of coal-rock layer structure, in particular to a method for rapidly and accurately detecting the boundaries of coal-rock layers. Background technique [0002] In the underground production process, the determination of the thickness of the coal seam and the position of the coal-rock boundary in the working face is the focus of geological exploration before production. During the formation process of the coal seam, it has experienced geological movement and tectonic stress, resulting in uneven thickness of the coal seam and fluctuations in the boundary between coal and rock. Production without a clear boundary between coal and rock will, on the one hand, lead to insufficient mining of some coal, resulting in waste left over, and on the other hand, a large amount of gangue will be mined, reducing coal mining efficiency. Accurate detection of coal-rock boundary position and coal seam t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/08G01N27/04
CPCG01N1/08G01N27/041
Inventor 邱黎明宋大钊何学秋刘强
Owner UNIV OF SCI & TECH BEIJING
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