Short-offset grounded-wire TEM method for efficient detection of mined-out areas in vegetation-covered mountainous coalfields
Nannan Zhou 1 2 Guoqiang Xue 1 Dongyang Hou 1 Hai Li 1 Weiying Chen 11 Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
2 Corresponding author. Email: znncas@126.com
Exploration Geophysics 48(4) 374-382 https://doi.org/10.1071/EG15095
Submitted: 26 August 2015 Accepted: 1 June 2016 Published: 14 July 2016
Abstract
The in-loop transient electromagnetic (TEM) method has been widely used for reliable investigation of mined-out areas of the subsurface. However, the method has limited applications in mountainous coalfields that are often covered with tall vegetation: first, it requires extra work to clear the surface and set up the TEM equipment; more importantly, dense vegetation restricts the required layout of a standard rectangular loop, and such geometry irregularity can decrease the detection accuracy. This study proposes using short-offset grounded-wire TEM (SOTEM) for enhanced detection of the mined-out areas in vegetation-covered mountainous fields. The distance between the SOTEM source and receivers is flexible and thereby the receiving location can be freely adjusted according to the environmental conditions of the surveying area, without reducing the detection resolution. Properties of the proposed SOTEM method are well tested before real applications, and our test indicates that SOTEM has an axis-symmetric field distribution, higher sensitivity to anomaly, and larger detection depth, compared to the conventional large-loop TEM method. Application to one coalfield in Changzhi (Shanxi Province, China) demonstrates the added value of implementing SOTEM for detecting the mined-out areas in this field and the results are well verified by the drilling result.
Key words: detection resolution, mined-out area, short-offset grounded-wire TEM, vegetation-covered mountainous coalfield.
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