Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method

Once a coal seam has been weathered and oxidized, the quality of the coal is lost and the coal resources are wasted. At the same time, new risks are introduced to the safe operation of the coal mine. Therefore, it is critical to determine the extent of the weathered and oxidized zone in the coal sea...

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Published in:Energy exploration & exploitation 2022-11, Vol.40 (6), p.1634-1648
Main Authors: Yang, Yang, Xiong, Bin, Peng, Sanxi, Liu, Siqin, Chen, Hanbo, Zhang, Tianyu
Format: Article
Language:English
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Coal mines
Data processing
Electrical resistivity
Electromagnetic properties
Mathematical models
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container_issue 6
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container_title Energy exploration & exploitation
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creator Yang, Yang
Xiong, Bin
Peng, Sanxi
Liu, Siqin
Chen, Hanbo
Zhang, Tianyu
description Once a coal seam has been weathered and oxidized, the quality of the coal is lost and the coal resources are wasted. At the same time, new risks are introduced to the safe operation of the coal mine. Therefore, it is critical to determine the extent of the weathered and oxidized zone in the coal seam. This paper depicts the electromagnetic characteristics of the weathered and oxidized zone of coal seams, briefly introduces the method of detection by transient electromagnetic method (TEM) and the data processing steps, and performs the numerical simulation for the simplified resistivity model of weathered and oxidized zone in a coal seam. It is observed that after the coal seam has been weathered and oxidized, the electromagnetic characteristics (secondary field potential and resistivity) will be dramatically affected, namely high secondary field potential and low resistivity. For experimental verification purposes, this study selects the test project of the Shixin Minefield in Shanxi, China as an example, and the accuracy for the detection of the weathered and oxidized zone of the coal seam using TEM is successfully verified.
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subjects Coal mines
Data processing
Electrical resistivity
Electromagnetic properties
Mathematical models
title Exploring weathered and oxidized zones of coal seams using the transient electromagnetic method
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