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Land-based TEM Data Processing: from Turn-off Ramp to Full Waveform
  • +2
  • Jianhui Li,
  • Xingchun Wang,
  • Xiangyun Hu,
  • Wei Yuan,
  • Peng Wang
Jianhui Li
Institute of Geophysics and Geomatics, China university of Geosciences, Wuhan, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China
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Xingchun Wang
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences
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Xiangyun Hu
China University of Geosciences (Wuhan)

Corresponding Author:xyhu@cug.edu.cn

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Wei Yuan
School of Earth Resources, China university of Geosciences; Coal Geological Bureau of the Inner Mongolia Autonomous Region
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Peng Wang
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.
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Data-processing methods only considering the turn-off ramp in transmitting waveforms are well established for land-based transient electromagnetic (TEM) methods. The turn-on ramp effects on late-time responses are generally neglected by data-processing methods. Our forward-modeling results of homogeneous half-space models show that the full-waveform effect which includes both effects caused by turn-on and turn-off stages is common for a wide range of conductivities. The inversion results for synthetic and field examples illustrate that the inversion algorithm which does not consider the full-waveform effects can lead to a higher resistivity in deeper parts of recovered models compared with the true model. Therefore, it is of vital importance to account for the full waveform effects in both forward modeling and inversion algorithms. We use synthetic examples to show how our inversion algorithms can improve the recovered model, and use real-data examples to show the importance of incorporating full transmitting waveforms in data-processing procedures.
10 Apr 2023Published in Journal of Geophysics and Engineering. 10.1093/jge/gxad025