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| The research on SOTEM and its application in mined-out area of coal mine |
| LU Yun-Fei1, XUE Guo-Qiang1, 2, QIU Wei-Zhong3, ZHOU Nan-Nan1, HOU Dong-Yang1 |
1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China;
2. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi'an 710054, China;
3. Shanxi Coal Geology No. 115 Exploration Institute, Datong 037003, China |
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Abstract The electrical source short-offset transient electromagnetic method (SOTEM) has characteristics of strong signal, high resolution, large investigation depth, and less influence by topography and underground structure. It is therefore suitable for the detection of low resistivity body and fine structure. In addition, it is easily arranged and the receiving instrument is light and easy to operate, so it is very suitable for difficult field area with complex terrain. In this paper, the SOTEM method is analyzed theoretically, and the spatial distribution characteristics of the transient electromagnetic response of the layered geoelectric model in different time spans are calculated and simulated. The result shows the superiority of the near field observation. Based on the analysis of the relative error of response between different geoelectric models and the variation characteristics with the abnormal resistivity, the authors investigated the capability of SOTEM for discriminating electrical anomalies. In this paper, the authors have obtained the theoretical judgment formula of SOTEM detection depth, and put forward the commonly used formula of probing depth. At the end of this paper, the application of SOTEM to the detection of the gob in a coal mine in Datong of Shanxi Province is given to illustrate the effectiveness of the method. According to the comparison, the detection results coincide with the drilling information.
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Received: 10 November 2016
Published: 10 April 2017
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