多激励源瞬变电磁探测方法在煤矿采空区的应用

doi:10.11720/wtyht.2022.1622

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Abstract

The large fixed-source loop is a commonly used device in the transient electromagnetic method (TEM). However, moving its transmitter requires a lot of manpower and time, greatly reducing the efficiency of the method. The electrical source TEM enjoys the advantages of large detection depth, less terrain restriction, and high efficiency. However, its signal intensity severely attenuated and it has a low signal-to-noise ratio in the case of a large offset, which limit its detection precision to a certain extent. To achieve high-precise geological exploration, this study built a forward model using the multi-excitation source TEM. With the detection of a water-bearing goaf of the Weijiadi coal mine in Gansu Province as a case study, this study compared the exploration performance of the multi-excitation source TEM with that of the conventional large fixed-source loop and the single-excitation source TEM. As verified by drilling, the multi-excitation source TEM can deliver better exploration performance in the study area. The results of this study can provide technical support and a reference for goaf detection in adjacent and similar areas.

Key words： goaf multi-excitation source TEM single-excitation source TEM large fixed-source loop forward modeling inversion

Received: 19 November 2021 Published: 03 January 2023

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	Hai-Chuan SUN
	Wen-Zhong WANG
	Zhi-Zhong LI
	Yong-Liang LIU

Cite this article:

Hai-Chuan SUN,Wen-Zhong WANG,Zhi-Zhong LI, et al. Application of the multi-excitation source transient electromagnetic method in the coal mine goaves[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1306-1314.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1622 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1306

Schematic diagram of load mode of Yee unit cell with multiple excitation sources

Model Sketch

Multi-trace map of line 32 under single excitation field source

Multi-xcitation field source (opposite current direction) line 32 multi-omponent trace

Multi-xcitation field source (same current direction) line 32 multi-omponent trace map

Sketch map of study area location

Sketch map of vertical “three zones”for collapse of mined-out area

Characteristics of formation resistivity

Geophysical engineering layout drawing

Schematic diagram of emission source and survey area location

Observation parameters of different emission sources

Data processing flowchart

Plot of measured apparent resistivity (a) and plot of inversion depth model (b)

Comprehensive geophysical profile of line 280 (left) and line 340 (right)

Elevation 1 000 m (a) and 1 050 m (b) resistivity contour plan

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