AEM Inversion of VTEM Data from a Resistive Terrain

Ross C Brodie

doi:10.1071/ASEG2012ab096

ISSN: 2202-0586
E-ISSN:

oa AEM Inversion of VTEM Data from a Resistive Terrain
Authors Ross C Brodie^a
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^a Geoscience Australia, GPO Box 378 Canberra, ACT 2601, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab096
- Published online: 01 Dec 2012

Abstract

Summary

Data from a VTEM™ airborne electromagnetic survey over resistive terrain is examined. Forward modelling and analysis of high-altitude lines shows that the amplitudes of random noise, bucking error, processing corrections and geological signals can be large compared to the geological signal in the resistive terrain. The negative impacts of the low geological signal to noise ratio on conductivity estimates generated by layered-earth inversion and conductivity transformations are demonstrated. The reader is alerted to the degree of uncertainty and non-uniqueness that is inherent in conductivity estimates generated from similar datasets.

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2012-12-01

2026-01-23

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References

Brodie, R.C., and Costelloe, M.T. 2011, Kombolgie VTEM™ AEM Survey Inversion Report: Geoscience Australia report.
Carter, S., Baron-Hay, S., Combrinck, M., and Moreton, M. 2009, Survey and Logistics Report on a helicopter borne Versatile Time Domain Electromagnetic (VTEM) survey: Pine Creek (Kombolgie) Project Area, Northern Territory, Geotech Airborne Pty. Ltd. report to Geoscience Australia.
Costelloe, M., and Brodie, R., 2011, Kombolgie AEM survey images to 2 km. Preview 150, 29-32.
Craig, M.A., 2011, Geological and energy implications of the Pine Creek region airborne electromagnetic (AEM) survey, Northern Territory, Australia. Geoscience Australia.
Green, A., and Lane, R., 2003, Estimating noise levels in AEM data: ASEG 16th Geophysical Conference and Exhibition, Extended Abstracts.
Macnae, J., and Baron-Hay, S., 2010, Reprocessing strategy to obtain quantitative early time data from historic VTEM surveys: ASEG 21st Geophysical Conference and Exhibition, Extended Abstracts.

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Article Type: Research Article

Keyword(s): airborne; electromagnetic; inversion; Kombolgie.; resistive; VTEM™

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oa AEM Inversion of VTEM Data from a Resistive Terrain

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