Newmont Transient Electromagnetic System

G. O. Dickson; G. W. Boyd

doi:10.1071/EG980047

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

Newmont Transient Electromagnetic System
Authors G. O. Dickson^a and G. W. Boyd^a
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^a Newmont Proprietary Ltd, ., 535 Bourke Street, Melbourne, , Vie, 3000, .
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 11, Issue 1-2, Jun 1980, p. 47 - 51
DOI: https://doi.org/10.1071/EG980047
- Published online: 01 Jun 1980

Abstract

Field data collected using Newmont's EMP system show good agreement with theoretical models for the halfspace and tabular bodies, given a non-ideal step excitation and the usual effect of horizontal layering. In particular the "smoke ring" or ring current effect predicted by Nabighian is observable for transient systems when the transmitter and receiver coil are not coincident. It is demonstrated that interpretation is best carried out when the response can be represented by the late time assymptotic expressions predicted by theory, for both the halfspace and tabular bodies. It is suggested that a sensitivity of 1/10 microvolt/amp at 50 msecs is necessary to recognise late time behaviour, particularly in the presence of conductive overburden.

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1980-06-01

2026-01-20

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References

BOYD, G.W., 1980. Newmont EMP surveys over Elura. Paper presented at Elura seminar, Sydney, February 1980.
BULGAKOV, J., 1973. Non-stationary field of an annular current at the surface of a uniform conducting medium. Paper No. 3 of a collection: "Nedra", Leningrad.
KAUFMAN, A., 1978. Frequency and transient responses of electromagnetic fields created by currents in confined conductors. Geophysics, Vol 43, No. 5; P. 1002-1010.
LEE, T., and LEWIS, R., 1974. Transient EM response of a large loop on a layered ground. Geophysical Prospecting, Vol. 22, pp 430-444.
LEE, T.( 1978. Depth estimation with PEM – A cautionary note. Bull. Aust. Soc. Explor. Geophys. Vol 9, P. 168-169.
LEWIS, R., and LEE, T., 1978. The transient electric fields about a loop on a halfspace. Bull. Aust. Soc. Explor. Geophys. Vol 9, P. 173-177.
NABIGHIAN, M.N., 1979. Quasi-static transient response of aeon-ducting half-space – An approximate representation. Geophysics, Vol 44, No. 10. P. 1700-1705.
WAIT, J.R., and OTT, R.H., 1972. On calculating the transient electromagnetic fields of a small current carrying loop over a homogenous earth. Pure and Applied Geophysics, Vol 95, P. 157-162.

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Article Type: Research Article

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Newmont Transient Electromagnetic System

Abstract

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