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| Distinguishing capability of SOTEM and CSAMT for low resistivity layer |
| HOU Dong-Yang1,2, XUE Guo-Qiang1,2,3, CHEN Wei-Ying1,2 |
1. Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
3. Key Laboratory of Coal Resources Exploration and comprehensive Utilization, Ministry of land and resource, Xi'an 710054 |
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Abstract Overcoming the shielding effect of conductor covered layer and realizing the effective detection of low resistivity layer underground constitute an important problem in electromagnetic exploration.Short offset transient electromagnetic (SOTEM) is receiving more and more attention because of its near source observation method.In order to analyze its detection capability,the authors made a comparison with a grounded electric source frequency device-(CSAMT),which is generally used nowadays.In this paper,the response characteristics of SOTEM and CSAMT in 1-D layered media are studied.In addition,two groups of electric models of low resistivity covered layer and low resistivity interbbed with different electrical characteristics are designed.Then detection capability is comparatively studied by calculating relative anomaly error.It is concluded by analysis that SOTEM is more sensitive to low resistivity covered layer than CSAMT and hence it is more favorable for detecting underground conductor layer.
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Received: 07 November 2015
Published: 10 February 2016
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