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A method and device for detecting the undulation shape of the orus ash top interface in the coal seam base

A top-interface and substrate technology, applied in the direction of measuring devices, electric/magnetic detection for well logging records, and re-radiation of acoustic waves

Active Publication Date: 2017-10-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of accurate detection of undulations of Ordovician limestone at the base of the coal seam, the present invention proposes a method and device for detecting the undulations of the Ordovician limestone interface at the base of the coal seam

Method used

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  • A method and device for detecting the undulation shape of the orus ash top interface in the coal seam base
  • A method and device for detecting the undulation shape of the orus ash top interface in the coal seam base
  • A method and device for detecting the undulation shape of the orus ash top interface in the coal seam base

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Embodiment 1

[0119] Taking the actual observation data of a mining area as an example, the effect of the topographic correction of the patent of the present invention is described.

[0120] Draw the electric field component apparent resistivity curve of all measuring points on a certain line in the area to be measured, such as Image 6 As shown, the horizontal coordinate represents the distance of the measuring point (arithmetic coordinate), and the vertical coordinate represents the frequency. Image 6 The middle curve is the apparent resistivity curve of the electric field component of each measuring point.

[0121] Using the apparent resistivity value of the electric field component to draw a contour profile, such as Figure 7 As shown in the figure, the abscissa represents the distance of the measuring point, and the ordinate represents the depth. Figure 7 The contours in are the apparent resistivity contours of the electric field component. In general, the fluctuation of the auste...

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Abstract

A method and device for detecting the undulating shape of the Ordovician limestone top interface at the base of a coal seam, involving the fields of geology and geophysics, and solving the problem of accurate detection of the undulating shape of the Ordovician limestone at the base of the coal seam. The corresponding characteristic parameters are used to predict the ups and downs of the ash top interface of the coal seam base, including: obtaining the electric field component value or the electric field component value and the magnetic field component value of each detection point in the section of the area to be measured changing with the detection frequency; according to the obtained electric field component value or electric field component value and magnetic field component value to obtain the depth-sounding apparent resistivity value of each detection point changing with the detection frequency, and determine the corresponding depth-sounding apparent resistivity value changing with the detection frequency according to each detection point. Resistivity curve; determine the feature point frequency corresponding to the minimum value of apparent resistivity on the depth-sounding apparent resistivity curve; determine the surface fluctuation of the austrian ash top interface of the coal seam base in the area to be measured according to the feature point frequency corresponding to each of the detection points form.

Description

technical field [0001] The invention relates to the fields of geology and geophysics, in particular to a method and a device for detecting the undulation shape of the orus ash top interface of a coal seam base. Background technique [0002] The shallow mining of coal resources has come to an end, and now it has entered the deep mining. The strong water-richness of Ordovician limestone in deep coal fields in some areas seriously threatens the safety of coal mine production. Accurate detection of coal field basement---Ordovician limestone deep complex aquifer and hydrogeological conditions are extremely important for the safe mining of coal mines. significance and practical application value. In the past exploration, three-dimensional seismic method was mainly used to predict the fluctuation of coal seam basement, but the high cost of seismic exploration, coupled with some special man-made and geological environments, was not conducive to the construction of seismic explorati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/26G01V3/38
Inventor 薛国强钟华森底青云侯东洋
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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