Interpretation and Removal of EM Coupling in IP Data

Todd W. Grant; Gerald W. Hohmann

doi:10.1071/EG989105

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

Interpretation and Removal of EM Coupling in IP Data
Authors Todd W. Grant^a and Gerald W. Hohmann^a
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^a Dept. of Geology and Geophysics University of Utah Salt Lake City, , Utah USA, 8411
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 20, Issue 1-2, Mar 1989, p. 105 - 110
DOI: https://doi.org/10.1071/EG989105
- Published online: 01 Mar 1989

Abstract

We have computed EM coupling responses for the dipole-dipole IP array over realistic 3-D bodies using a volume integral equation approach. The objectives of these simulations are to gain insight regarding negative EM coupling over good conductors, to analyze the phase extrapolation method of removing EM coupling, and to determine whether interpretation of the EM coupling can help resolve the resistivity structure. Our results show that a good conductor, especially if it is shallow, can produce a complex pattern of negative and positive coupling in a pseudosection. Extrapolating three-frequency phase data to zero frequency eliminates EM coupling in most cases; however, residual EM effects may be present in extremely low-resistivity environments. We are studying ways of utilizing EM coupling to provide information about 3-D bodies beyond that produced by DC resistivity data.

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1989-03-01

2026-01-24

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References

Dey, A. and Morrison, H. F., 1973, ‘Electromagnetic coupling in frequency and time domain induced polarization surveys over a multilayered earth’, Geophysics,38, 380-405.
Hallof, P. G., 1974, ‘The IP phase measurement and inductive coupling’, Geophysics,39, 650-665.
Hohmann, G. W., 1973, ‘Electromagnetic coupling between grounded wires at the surface of the earth’, Geophysics,38, 854-863.
Newman, G. A., Hohmann, G. W., and Anderson, W. L., 1986, ‘Transient electromagnetic response of a three-dimensional body in a layered earth’, Geophysics,51, 1608-1627.
Parra, J. Q, 1984, ‘Effects of pipelines on spectral induced-polarization surveys’, Geophysics,49, 1979-1992.
Pelton, W. H., Ward, S. H., Hallof, P. G., Sill, W. R., and Nelson, P. H., 1978, ‘Mineral discrimination and removal of inductive coupling with multifrequency IP’, Geophysics,43, 588-609.
Van Voorhis, G. D., Nelson, P. H., and Drake, T. L., 1973, ‘Complex resistivity spectra of porphyry copper mineralization’, Geophysics,38, 49-60.
Wynn, J. C. and Zonge, K. L., 1975, ‘EM coupling, its intrinsic value, its removal and the cultural coupling problem’, Geophysics,40, 831-850.
Zonge, K. L., Sauck, W. A., and Sumner, J. S., 1972, Comparison of time, frequency and phase measurements in induced polarization’, Geophysical Prospecting,20, 626-648.

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Article Type: Research Article

Keyword(s): computer modeling; EM coupling; induced polarization; inductive coupling; phase extrapolation

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Interpretation and Removal of EM Coupling in IP Data

Abstract

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