Transient electromagnetic surveys with unimodal transverse magnetic field: ideas and results

Vladimir S. Mogilatov, Arkadiy V. Zlobinskiy, Boris P. Balashov

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The theory behind transient electromagnetic surveys can be well described in terms of transverse magnetic and transverse electric modes. Soundings using transverse magnetic and transverse electric modes require different source configurations. In this study, we consider an alternating transverse magnetic field excitation by a circular electric dipole. The circular electric dipole transmitter is a horizontal analogue of the vertical electric dipole. Offshore surveys using circular electric dipole might represent an alternative to the conventional marine controlled-source electromagnetic method at shallow sea and/or for exploring relatively small targets. Field acquisition is carried out by recording either electric or magnetic responses. Electric responses bear information on the 1D structure of a layered earth and successfully resolve high-resistivity targets in marine surveys. Land-based circular electric dipole soundings are affected by induced polarisation. On the contrary, magnetic responses are absent on the surface of a 1D earth, and as a result, they are very sensitive to any and even very small 3D conductivity perturbations. In addition, they are sensitive to induced polarisation or some other polarisation effects in the subsurface. At present, circular electric dipole transmitters and magnetic receivers are successfully used in on-land mineral and petroleum exploration.

Original languageEnglish
Pages (from-to)1380-1397
Number of pages18
JournalGeophysical Prospecting
Volume65
Issue number5
DOIs
Publication statusPublished - 1 Sep 2017

Keywords

  • Circular electric dipole
  • Electrical prospecting
  • Lorentz's force
  • Transient electromagnetic
  • Transverse magnetic field

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