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A Comparison of Different-Mode Fields Generated from Grounded-Wire Source Based on the 1D Model

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Abstracts

Traditional TEM study mainly focuses on the generation and application of the TE field using a loop or grounded-wire source; but in recent decades, lots of efforts have been made for implementation of the TM field and even the integration of the TE field with the TM one into anomaly detection in the subsurface. However, no applicable principles have been proposed for selecting the optimal electromagnetic field for various subsurface targets. The transient electromagnetic (TEM) fields generated from grounded-wire source consist of the TE-mode response (current-carrying wire), the TE–TM mode response (grounding ends) and the combined TEM-mode response (current-carrying wire and grounding ends). This study performs a comparison of TE/TE–TM/TEM fields by generating them from grounded-wire source and testing their distribution characteristics, detection depth, and sensitivity to anomalies, using both synthetic 1D model and two field surveys in China. The comparisons demonstrate that, the detection depth of the TE–TM field is smaller than those of both the TE and combined TEM fields. Meanwhile, for electric field, the TE–TM response provides a better detection than the TEM one, but with an uneven distribution. Therefore, the TE–TM electric field requires well-designed arrangements of receiving positions when applied to real projects. For the magnetic field, the TEM response has the best detection capability compared to the TE and TE–TM ones, but is least sensitive to layer thickness and resistivity, especially for an embedded layer with low resistivity.

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Acknowledgments

This research was supported by R&D of Key Instruments and Technologies for Deep Resources Prospecting (the National R&D Projects for Key Scientific Instruments), Grant No.ZDYZ2012-1-05-04,the State Major Basic Research Program of the People’s Republic of China (2012CB416605) and Natural Science Foundation of China (NSFC) (41174090 41174108, and 41130419). Finally, the authors would like to thank three reviewers, the editor for many helpful comments and suggestion, and Dr. Di H. B. for grammar and English expression.

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Authors and Affiliations

  1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Nan-Nan Zhou, Guo-qiang Xue, Hai Li, M. Younis, Dong-yang Hou, Hua-sen Zhong, Wei-ying Chen & Jiang-wei Cui

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  1. Nan-Nan Zhou
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  2. Guo-qiang Xue
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  3. Hai Li
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Correspondence to Nan-Nan Zhou.

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Zhou, NN., Xue, Gq., Li, H. et al. A Comparison of Different-Mode Fields Generated from Grounded-Wire Source Based on the 1D Model. Pure Appl. Geophys. 173, 591–606 (2016). https://doi.org/10.1007/s00024-015-1088-8

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