Emax conductivity-depth transformation of airborne TEM data

P. K. Fullagar; J.E. Reid

doi:10.1071/ASEG2001ab044

ISSN: 2202-0586
E-ISSN:

oa Emax conductivity-depth transformation of airborne TEM data
Authors P. K. Fullagar^a and J.E. Reid^b
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^a Fullagar Geophysics Pty Ltd Brisbane, , Australia, [email protected] ^b University of Tasmania Hobart, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 2
DOI: https://doi.org/10.1071/ASEG2001ab044
- Published online: 01 Dec 2001

Abstract

Conductivity-depth imaging is a convenient form of presentation for preliminary interpretation of ground and airborne EM data. This paper describes the airborne EM adaptation of the Emax conductivity-depth transformation, originally developed for ground TEM. The transformation proceeds in two stages: first the apparent conductivity is determined at a given delay time; then the depth of the current maximum in a half-space with conductivity equal to the apparent conductivity is adopted as the apparent depth at that time.

The advantage of the Emax transformation is that it is readily adaptable to a wide variety of TEM data. The disadvantage is that apparent conductivity is not unique, nor always defined. In practice this does not usually pose difficulties for transformation of airborne EM.

The utility of the Emax transformation to airborne data is illustrated via application to GEOTEM_DEEP total field data. The total field provides a degree of immunity to receiver mis-orientation.

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References

Eaton, P.A., 1998, Application of an improved technique for interpreting transient electromagnetic data: Exploration Geophysics, 29, 175-183.
Fullagar, P.K., 1985, Determination of apparent conductivity from INPUT data: WMC Exploration Division Memorandum XCM/SA/19.
Fullagar, P.K., 1989, Generation of conductivity-depth pseudo-sections from coincident loop and in-loop TEM data: Exploration Geophysics, 20,43-45.
Fullagar, P.K., and Reid, J.E., 1992, Conductivity-depth transformation of fixed loop TEM data: Exploration Geophysics, 23, 515-520.
Macnae, J.C., Smith, R., Polzer, B.D., Lamontagne, Y., and Klinkert, P.S., 1991, Conductivity-depth imaging of airborne step-response data: Geophysics, 56, 102-114.
Rajagopalan, S., and Fullagar, P.K., 1998, 3-component airborne EM surveys - effect of orientation errors and interpretation of the "total field": paper presented at AEM’98 Conference, Sydney, February 23-25.
Reid, J.E., and Fullagar, P.K., 1998, Conductivity-depth transformation of slingram transient electromagnetic data: Exploration Geophysics, 29, 570-576.
Sengpiel, K.-P., 1988, Approximate inversion of airborne EM data from a multilayered ground: Geophysical Prospecting, 36, 446-459.
Weaver, J.T., 1970, The general theory of electromagnetic induction in a conducting half-space: J. Roy. astr. Soc, 22, 83-100.

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Article Type: Research Article

Keyword(s): airborne EM; apparent conductivity; conductivity imaging

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oa Emax conductivity-depth transformation of airborne TEM data

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