An Empirical Procedure for Removal of Polarisation Effects Observed in TEM Field Data

Peter Elliott

doi:10.1071/EG991575

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

An Empirical Procedure for Removal of Polarisation Effects Observed in TEM Field Data
Authors Peter Elliott^a
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^a Elliott Geophysics Pty Ltd, 17 Grandview Avenue Urrbrae, SA, 5064
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 22, Issue 4, Dec 1991, p. 575 - 582
DOI: https://doi.org/10.1071/EG991575
- Published online: 01 Dec 1991

Abstract

Research has demonstrated that negative TEM voltages observed in coincident loop or in-loop survey data are due to induced polarisation effects. These effects have approximate negative exponential decays which are most often observed in late time data. By removing the inductive half-space and thin layer responses, and then matching and removing the negative exponential due to polarisation effects from affected readings, it is possible to provide a better presentation of data and unveil anomalous conductive responses which would otherwise have been overlooked.

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1991-12-01

2026-01-23

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References

Asten, M. W., & Price, O. G., (1985). Transient EM sounding by the in/out-loop method’. Explor. Geophys., 16, 165-168.
Elliott, P. J., (1987). ‘Negative Sirotem anomalies — case studies’. Explor. Geophys., 18, 42-47.
Flis, M. F., (1987). ‘IP effects in 3D TEM data — theory and case histories’. Explor. Geophys., 18, 55-58.
Lee, T, (1975). ‘Sign reversals in the transient method of electrical prospecting (one loop version)’. Geophys. Prosp, 23, 653-662.
Lee, T, (1981a). ‘The effect of displacement currents on time domain electromagnetic fields’. Explor. Geophys., 12, 34-36.
Lee, T, (1981b). ‘Transient electromagnetic response of polarisable ground’. Geophysics, 46, 1037-1041.
Lee, T, (1981c). ‘The Cole-Cole model in time domain induced polarisation’. Geophysics, 46, 932-933.
Smith, R. S., (1988). ‘A plausible mechanism for generating negative coincident loop transient electromagnetic responses’. Ph.D. Dissertation, Research in Applied Geophysics No. 44. University of Toronto.
Weidelt, P., (1982). ‘Response characteristics of coincident-loop transient electromagnetic systems’. Geophysics, 47,1325-1330.

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Article Type: Research Article

Keyword(s): negative decay; polarisation effects; TEM

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An Empirical Procedure for Removal of Polarisation Effects Observed in TEM Field Data

Abstract

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