Electromagnetic logging technique based on borehole radar

Sixin Liu, Motoyuki Sato

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


An electromagnetic logging technique based on borehole radar is introduced in this paper. The tool consists of one transmitter and two receivers, which can be used to cancel the effect of the antenna characteristics by taking the ratio of two receiver signals. Since receiver signals measured in the time domain can be converted into the frequency domain by Fourier transformation, the amplitude ratio and the phase difference between two receiver signals in a wide-frequency band are obtainable. The response of the tool to different formations is investigated, and the algorithm that converts the amplitude and the phase information to the conductivity and the relative permittivity of the surrounding medium is given by a three-dimensional finite-difference time domain. The effect of the borehole on measurement and the response of the tool to a formation interface are simulated and analyzed numerically. The validity of this technique is confirmed by experiment. This technique can be applied to detect physical properties, including the conductivity and the relative permittivity, of the surrounding medium and the locations of the fractures intersecting the borehole.

Original languageEnglish
Pages (from-to)2083-2092
Number of pages10
JournalIEEE Transactions on Geoscience and Remote Sensing
Issue number9
Publication statusPublished - 2002 Sept


  • Borehole radar
  • Conductivity
  • Electromagnetic (EM) logging
  • Finite-difference time domain (FDTD)
  • Relative permittivity conductivity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)


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