Izvestiya, Physics of the Solid Earth

, Volume 54, Issue 2, pp 349–358 | Cite as

On the Locality of Transient Electromagnetic Soundings with a Single-Loop Configuration

Article
  • 3 Downloads

Abstract

The possibilities of reconstructing two-dimensional (2D) cross sections based on the data of the profile soundings by the transient electromagnetic method (TEM) with a single ungrounded loop are illustrated on three-dimensional (3D) models. The process of reconstruction includes three main steps: transformation of the responses in the depth dependence of resistivity ρ(h) measured along the profile, with their subsequent stitching into the 2D pseudo section; point-by-point one-dimensional (1D) inversion of the responses with the starting model constructed based on the transformations; and correction of the 2D cross section with the use of 2.5-dimensional (2.5D) block inversion. It is shown that single-loop TEM soundings allow studying the geological media within a local domain the lateral dimensions of which are commensurate with the depth of the investigation. The structure of the medium beyond this domain insignificantly affects the sounding results. This locality enables the TEM to reconstruct the geoelectrical structure of the medium from the 2D cross sections with the minimal distortions caused by the lack of information beyond the profile of the transient response measurements.

Keywords

profile electromagnetic soundings transient processes transformations 1D inversion construction of 2D sections 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. AEMR TEM-3D-WIZARD software, User Manual. www.aemr.net, 2016. Cited March 29, 2017.Google Scholar
  2. Barsukov, P. and Fainberg, E., Shallow investigations by TEM-FAST technique: methodology and examples: theory, modeling, practice, in Electromagnetic Sounding of the Earth’s Interior: Theory, Modeling, Practice, Spichak, V.V., Ed., 2nd ed., Amsterdam: Elsevier, 2015, Chapter 3, pp. 47–78.CrossRefGoogle Scholar
  3. Barsukov, P.O. and Fainberg, E.B., On the geoelectric structure of the Sphinx Area in Egypt, Near Surf. Geophys., 2016, vol. 14, no. 1, pp. 39–45.Google Scholar
  4. Barsukov, P.O., Fainberg, E.B., and Khabensky, E.O., The antenna polarization effect in transient electromagnetic sounding, Izv., Phys. Solid Earth, 2003, vol. 39, no. 11, pp. 949–954.Google Scholar
  5. Christensen, N. B., Sensitivity functions of transient electromagnetic methods, Geophysics, 2014, vol. 79, no. 4, pp. E167–E182. doi 10.1190/GEO2013-0364.1CrossRefGoogle Scholar
  6. Commer, M., Hordt, A., Helwig, S., and Scholl, C., Threedimensional inversion of time-domain EM data with highly constrained model complexities, 20 Kollokuium elektromagnetische tiefenforschung, Konigstein, 2003, pp. 114–123.Google Scholar
  7. Druskin, V. and Knizhnerman, L., A spectral semi-discrete method for the numerical solution of 3-D non-stationary electric prospecting problem, Phys. Solid Earth, 1988, vol. 24, pp. 641–648.Google Scholar
  8. Gubatenko, V.P. and Tikshaev, V.V., On the change in the sign of electromotive force of induction in the transient electromagnetic method, Izv. Akad. Nauk SSSR, Fiz. Zemli, 1979, no. 3, pp. 95–99.Google Scholar
  9. Haber, E., Oldenburg, D.W., and Shekhtman, R., Inversion of time domain three-dimensional electromagnetic data, Geophys. J. Int., 2007, vol. 171, pp. 550–564. doi 10.1111/j.1365-246X.2007.03365.xCrossRefGoogle Scholar
  10. Kamenetsky, F.M., Stettler, E.H., and Trigubovich, G.M., Transient Geo-Electromagnetics, Munich: GEOS, 2010.Google Scholar
  11. Oldenburg, D.W. and Pratt, D.A., Geophysical inversion for mineral exploration: a decade of progress in theory and practice, Proceedings of Exploration 07: The Fifth Decennial International Conference on Mineral Exploration, Milkereit, B., Ed., Toronto, 2007, pp. 61–95.Google Scholar
  12. Svetov, B.S. and Barsukov, P.O., Transformation of quasistationary geoelectric processes into the equivalent wave processes, Izv. Akad. Nauk SSSR, Fiz. Zemli, 1984, no. 8, pp. 29–37.Google Scholar
  13. Verzhak, D.V. and Garanin, K.V., Diamond deposits of the Arkhangelsk region and ecology problems of their development, Vestn. Mosk. Univ., 2005, vol. 6, pp. 18–27.Google Scholar
  14. Weidelt, P., Response characteristic of coincident loop transient electromagnetic system, Geophysics, 1982, vol. 47, no. 9, pp. 1325–1330.CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Geoelectromagnetic Research Centre, Schmidt Institute of Physics of the EarthRussian Academy of SciencesTroitskRussia

Personalised recommendations