Abstract
The intrusion of magmatic rocks into coal seams affects the coal quality and leads to unforeseen hazards in safety of the coal mines’ production. This paper summarizes the mechanism of magmatic rocks intruding into coal seams, depicts the electromagnetic characteristics of the coal seams intruded by magmatic rocks, briefly describes the characteristics of transient electromagnetic method (TEM), and introduces the method of detection by TEM and the data processing steps. Then, the effectiveness of TEM in detecting the ranges of the coal seams intruded by magmatic rocks is theoretically analysed. It is observed that after the intrusion of magmatic rocks in the coal seams, 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 Tongxin Minefield in the Datong Coalfield in Shanxi, China as an example, and the accuracy for the detection of the ranges of the coal seams intruded by magmatic rock using TEM is successfully verified.
Highlights
During the production process of some coal mines, magmatic rocks’ intrusion into the coal seams has been observed [1]
This paper proposes a method for detecting the range of coal seams intruded by magmatic rock by using the transient electromagnetic method (TEM)
Combined with the analysis of Transient electromagnetic characteristics of coal seams intruded by magmatic rocks engineering examples, the following conclusions can be drawn: After the coal seams have been intruded by magmatic rocks, the physical properties will alter greatly
Summary
During the production process of some coal mines, magmatic rocks’ intrusion into the coal seams has been observed [1]. Many scholars have performed much research regarding the detection methods of magmatic rocks’ intrusion into coal seams, and several exploration techniques have been proposed One of these is a direct prediction method based on drilling and logging data. The network of drills will seriously affect the detection accuracy of the magmatic rock boundary, which limits its implementation in large scale Another method is a geophysical prediction such as gravitational, magnetic and seismic methods. The resolution of seismic data obtained by conventional seismic exploration is limited, and it is difficult to accurately obtain the magmatic rock layers intruding into the coal seams, which results in the interpretations of seismic methods not being able to fully meet the requirements. Combined with an engineering example, it can be found that using TEM to detect the range of coal seams intruded by magmatic rock has an ideal effect
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