Transient electromagnetic characteristics of coal seams intruded by magmatic rocks

PLoS One. 2022 Feb 16;17(2):e0263293. doi: 10.1371/journal.pone.0263293. eCollection 2022.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Coal / analysis*
  • Coal Mining*
  • Electromagnetic Phenomena*
  • Humans
  • Soil / chemistry*
  • Volcanic Eruptions*

Substances

  • Coal
  • Soil

Grants and funding

This Research is sponsored by the National Natural Science Foundation of China (Nos. 42174080, 41674075, and 42062015), co-funded by the Natural Science Foundation of Guangxi Province (Nos. 2016GXNSFGA380004 and 2018AD19204), Research Start-up Foundation of Guilin University of Technology (No. RD2100002165), and China Postdoctoral Science Foundation Funded Project (No. 2021MD703820).