Making EM systems and bore logs speak the same language

Aaron Davis; Juerg Hauser

doi:10.1080/22020586.2019.12073078

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Making EM systems and bore logs speak the same language
Authors Aaron Davis^a and Juerg Hauser^b
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^a CSIRO, Kensington, , WA, 6151, [email protected] ^b CSIRO, Kensington, , WA, 6151, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 3
DOI: https://doi.org/10.1080/22020586.2019.12073078
- Published online: 01 Dec 2019

Abstract

Summary

Borehole induction logs, together with lithology records, are valuable for inferring geological and geophysical features in the subsurface. They offer insight in the relationship between geology and geophysics, and are an important source of information for determining the success of a planned airborne electromagnetic (AEM) survey for recovering features of interest.

Often, bore logs are used as the ‘ground-truth for an AEM system, and are employed for system selection pre-survey and ‘validation’ post-survey.

We discuss the use of electromagnetic borehole logs for calibrating and validating AEM survey results in a sensible way: by comparing the measurements at the resolution power of the AEM system itself.

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2026-01-22

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References

Christensen, N.B., and Lawrie, K.C. (2017). A novel approach to comparing AEM inversion results with borehole conductivity logs. Exploration Geophysics.
Christensen, C.W., Pfaffhuber, A.A., Anschütz, H., and Smaavik, T.F. (2015). Combining airborne electromagnetic and geotechnical data for automated depth to bedrock tracking. Journal of Applied Geophysics 119, 178–191.
Davis, A., Munday, T., and George, R. (2013). Gascoyne River airborne electromagnetic (AEM) survey I: system selection report (Perth, Australia: CSIRO).
Green, P.J. (1995). Reversible jump Markov chain Monte Carlo computation and Bayesian model determination. Biometrika 82, 711–732.
Lane, R., Heislers, D., and McDonald, P. (2001). Filling in the gaps ? validation and integration of airborne EM data with surface and subsurface observations for catchment management ? an example from Bendigo, Victoria, Australia. In Exploration Geophysics, p. 225.
Lawrie, K.C., Brodie, R.S., Tan, K.P., Gibson, D.L., Magee, J.W., Clarke, J.D.A., Halas, L., Gow, L., Somerville, P., Apps, H., et al. (2012). Securing Broken Hill’s water supply: assessment of conjunctive water supply options involving managed aquifer recharge and/or groundwater extraction at Menindee Lakes : data acquisition, processing, analysis and interpretation methods.
Ley-Cooper, A.Y., and Davis, A.C. (2010). Can a borehole conductivity log discredit a whole AEM survey? (Sydney: CSIRO Publishing), pp. 1–3.

/content/journals/10.1080/22020586.2019.12073078

Article Type: Research Article

Keyword(s): AEM; borehole induction logs; comparison; RJ-MCMC

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