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novel apparent resistivity for land-based controlled-source electromagnetic method.

Authors :
Huang, Xiangyu
Tang, Jingtian
Xiao, Xiao
Jiang, Qiyun
Yang, Zhi
Hu, Shuanggui
Source :
Journal of Geophysics & Engineering; Jun2022, Vol. 19 Issue 3, p562-577, 16p
Publication Year :
2022

Abstract

Apparent resistivity is a significant tool in the controlled-source electromagnetic method (CSEM). The Cagniard apparent resistivity, which is defined by the ratio of the magnetic and electric fields, has been widely used in CSEM interpretation. However, it is only suitable for the far zone, where the signals are weak. Although another apparent resistivity based on horizontal electric field E <subscript>x</subscript> can work in transition zone, its measurable zone is narrow. To better take the advantage of strong signals in non-far zone, we present a novel apparent resistivity by sophisticatedly combining the horizontal electric field and vertical magnetic field. We analyze the asymptotic characteristic of our apparent resistivity in the near and far zones using a theoretical formula. Synthetic data from the layered model show that when in the far zone, our apparent resistivity obtains the same performance as the Cagniard resistivity and E <subscript>x</subscript> resistivity. Besides, our apparent resistivity can still wok well when azimuth approaches 45° in the tranzition zone. Field data collected in Tongling, China further demonstrate the practicability and advantages of our apparent resistivity. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17422132
Volume :
19
Issue :
3
Database :
Complementary Index
Journal :
Journal of Geophysics & Engineering
Publication Type :
Academic Journal
Accession number :
158724853
Full Text :
https://doi.org/10.1093/jge/gxac037