Conductivity-depth Transformation of Fixed Loop TEM Data

P. K. Fullagar; J. E. Reid; P. K. Fullagar

doi:10.1071/EG992515

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

Conductivity-depth Transformation of Fixed Loop TEM Data
Authors P. K. Fullagar^a, J. E. Reid^b and P. K. Fullagar^a,b
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^a Western Mining Corporation Limited, P.O. Box 114, DAW PARK, SA, 5041 ^b Department of Geology & GeophysicsUniversity of Sydney, , SYDNEY, NSW, 2006
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 23, Issue 3, Jun 1992, p. 515 - 519
DOI: https://doi.org/10.1071/EG992515
- Received: 09 Sep 1992
- Published online: 01 Jun 1992

Abstract

A computationally efficient transformation is being developed to convert fixed loop TEM profiles to apparent conductivity versus depth pseudo-sections. Such pseudo-sections facilitate first-pass interpretation for geologists and geophysicists alike. Following Fullagar (1989), the apparent depth at each delay time is equated to the depth of the current maximum in a half-space with conductivity corresponding to the apparent conductivity at that time. The non-uniqueness in the apparent conductivity at any (x,t) can be overcome by identifying the unique apparent conductivity associated with downward current diffusion. Initial applications of the transformation to theoretical TEM decays and to field data from the Canning Basin demonstrate its capability to provide a reliable qualitative portrayal of conductivity structure.

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References

Eaton, P. A. and Hohmann, G. W., (1989). ‘A rapid inversion technique for transient electromagnetic soundings’, Phys. Earth Planet. Int., 53, 384-404.
Fullagar, P. K., (1989). ‘Generation of conductivity-depth pseudo-sections from coincident loop and in-loop TEM data’, Exploration Geophysics, 20, 43-45.
Macnae, J. and Lamontagne, Y., (1987). ‘Imaging quasi-layered conductive structures by simple processing of transient electromagnetic data’, Geophysics, 52, 545-554.
Nekut, A. G., (1987). ‘Direct inversion of time domain electromagnetic data’, Geophysics, 52, 1432-1435.
Raiche, A. P., (1987). ‘Transient electromagnetic field computations for polygonal loops on layered earths’, Geophysics, 52, 785-793.
Raiche, A. P. and Gallagher, R. G., (1985). ‘Apparent resistivity and diffusion velocity’, Geophysics, 50, 1628-1633.
Smith, R. S. and Buselli, G., (1991). ‘Examples of data processed using a new technique for presentation of coincident- and in-loop impulse-response transient electromagnetic data’, Exploration Geophysics, 22, 363-368.
Spies, B. R. and Eggers, D. E., (1986). ‘The use and misuse of apparent resistivity in electromagnetic methods’, Geophysics, 51, 1462-1471.
Wait, J. R., (1960). ‘Propagation of electromagnetic pulses in a homogeneous conducting earth’, Appl. Sci. Res., B VIII, 213-396.

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Article Type: Research Article

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Conductivity-depth Transformation of Fixed Loop TEM Data

Abstract

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