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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gi-2019-37
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-2019-37
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Feb 2020

06 Feb 2020

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This preprint is currently under review for the journal GI.

A new borehole electromagnetic receiver developed for CSEM methods

Sixuan Song1, Ming Deng1, Kai Chen1, Muer A2, and Sheng Jin1 Sixuan Song et al.
  • 1School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing, China
  • 2Hangzhou Hikvision Digital Technology Co.,Ltd.,Hangzhou, China

Abstract. Conventional surface electromagnetic methods have limitations of shallow detection depth and low resolution. In an attempt to increase the detection depth and resolution, borehole-surface electromagnetic methods for electromagnetic three-dimensional observations of ground, tunnels, and boreholes has been developed. Current borehole receivers only measure a single parameter of the magnetic field component, which does not meet the special requirements of controlled source electromagnetic (CSEM) methods. This study proposes a borehole electromagnetic receiver which realizes synchronous acquisition of the vertical electric field component in the borehole and the three-axis orthogonal magnetic field components. This receiver uses Ti electrodes and fluxgates as sensors to acquire electric and magnetic field components. Multi-component comprehensive observation methods that add the electric field component can effectively support the CSEM method, improve detection accuracy, and show broad potentials for detecting deep ore bodies. We conducted laboratory and field experiments to verify the performance of our new borehole electromagnetic receiver. The receiver achieved magnetic field noise less than 6 pT/√Hz at 1 kHz, and the electric field noise floor was approximately 10 nV/√Hz at 1 kHz. The −3 dB electric field bandwidth can reach DC ~ 10 kHz. Results of our experiments support the claim that high-quality CSEM signals can be obtained using this new borehole electromagnetic receiver, and that the electric field component exhibits sufficient advantages for measuring the vertical component of the electric field.

Sixuan Song et al.

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Sixuan Song et al.

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Latest update: 06 Apr 2020
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Short summary
Current borehole receivers only measure a single parameter of the magnetic field component, which does not meet the special requirements of controlled source electromagnetic methods.This study proposes a borehole electromagnetic receiver which realizes multi-component synchronous acquisition of adding the vertical electric field component. Results of the experiments show that the design has the performance of low noise and wide band and that high quality CSEM signals were obtained.
Current borehole receivers only measure a single parameter of the magnetic field component,...
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