Layered Earth Models Using Downhole Electromagnetic Receivers

A. P. Raiche; L. A. Bennett

doi:10.1071/EG987325

ISSN: 0812-3985
E-ISSN: 1834-7533

Layered Earth Models Using Downhole Electromagnetic Receivers
Authors A. P. Raiche^a and L. A. Bennett^a
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^a CSIRO Institute of Energy and Earth ResourcesPresently CRA Exploration Pty Ltd, PO Box 136 North Ryde, , NSW, 2113, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 18, Issue 3, Jun 1987, p. 325 - 329
DOI: https://doi.org/10.1071/EG987325
- Published online: 01 Jun 1987

Abstract

The transient electromagnetic (TEM) responses of several layered earth models are examined for the configuration consisting of a vertical downhole receiver and a large fixed loop source, on or above the earth’s surface. It is shown that a conductive overburden will cause the magnetic field at depth to be greatly attenuated at early times, but considerably enhanced at late times. The use of a downhole receiver will improve the resolution of conductive units, but adds nothing to the already low probability of detecting resistive units using TEM methods. Compared with surface receivers, a downhole receiver will have a much improved probability of detecting whether or not a buried layer has an intrinsic IP response. Lastly, it is shown that the combination of an airborne transmitting loop and a downhole receiver would constitute an interesting and feasible exploration method.

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1987-06-01

2026-01-25

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References

Anderson, W. L. (1979)—‘Numerical integration of related Hankel transforms or orders 0 and 1 by adaptive digital filtering’, Geophysics44, 1287-1305.
Knight, J. H. & Raiche, A. P. (1982)—‘Transient electromagnetic calculations using the Gaver-Stehfest inverse Laplace transform method’, Geophysics47, 47-50.
Pelton, W. H., Ward, S. H., Hallof, P. G., Sill, W. R. & Nelson, P. H. (1978)—‘Mineral discrimination and removal of inductive coupling with multifrequency IP’, Geophysics43, 588-609.
Raiche, A. P. (1984)—‘The effect of ramp turnoff on the TEM response of a layered earth’, Bull. Aust. Soc. Explor. Geophys.15(1), 37-41.
Raiche, A. P., Bennett, L. A., Clark, P. & Smith, R. J. (1985)—‘The use of Cole-Cole impedances to interpret the TEM response of layered earths’, Exploration Geophysics16, 271-272.
Raiche, A. P. (1987)—‘Computational aspects of TEM layered earth calculations for polygonal loops’, Geophysics52 (in press).

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Article Type: Research Article

Keyword(s): airborne transmitter; computer modelling; conductive overburden; downhole EM; IP effects; layered earth

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Layered Earth Models Using Downhole Electromagnetic Receivers

Abstract

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