Approximate 2D Inversion of AEM Data

Peter Wolfgram; Niels B. Christensen; Daniel Sattel

doi:10.1071/ASEG2003ab185

ISSN: 2202-0586
E-ISSN:

oa Approximate 2D Inversion of AEM Data
Authors Peter Wolfgram^a, Niels B. Christensen^b and Daniel Sattel^c
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^a Fugro Airborne Surveys, , Australia, [email protected] ^b University of Aarhus, , Denmark, [email protected] ^c Fugro Airborne Surveys, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2003ab185
- Published online: 01 Aug 2003

Abstract

Airborne electromagnetic (AEM) data are presently inverted with one-dimensional (ID) models either as Conductivity Depth Images (CDI) or with full non-linear inversion to build model sections of concatenated ID models. If lateral conductivity changes are small, ID models are justified. However, AEM investigations are often carried out specifically to find localised conductors and in this case ID inversion is insufficient and will often produce artefacts in the model section.

We have developed an approximate inversion method that deals with laterally inhomogeneous sections. The method is based on the Adaptive Born Approximation previously applied by one of the authors (NBC) to the interpretation of central-loop ground EM profiles. The technique reproduces synthetic models of moderate conductivity contrasts without the artefacts typically seen in CDI sections. The computing speed is comparable to that of stitched ID inversions.

An example of processing field data over a massive Nickel Sulphide deposit shows promising results for routine application on large AEM data sets.

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References

Christensen, N., 1997, Electromagnetic subsurface imaging. A case for an adaptive Born approximation: Surveys in Geophysics 18,477-510.
Lane, R., Green, A., Golding, C, Owers, M., Pik, P., Plunkett, C, Sattel, D., and Thorn, B., 2000, An example of 3D conductivity mapping using the TEMPEST AEM system: Exploration Geophysics 31, 162-172.
Liu, G. and Asten, M., 1993, Conductance-depth imaging of airborne TEM data: Exploration Geophysics 24, 655-662.
Raiche, A., 1998, Modelling the time-domain response of AEM systems: Exploration Geophysics 29, 103-106.
Sattel, D., 2001, The application of Zohdy’s method on AEM data: ASEG 15 Geophysical Conference and Exhibition, August 2001, Brisbane.
Sattel, D., and Kgotlhang, L., 2003, Groundwater exploration with AEM inh the Boteti area, Botswana: ASEG 16111 Geophysical Conference and Exhibition, February 2003, Adelaide.
Sattel, D. and Reid, J., 2001, Automated anomaly modelling of AEM data with magnetic dipoles buried inside a layered earth: ASEG 15 Geophysical Conference and Exhibition, August 2001, Brisbane.
Stolz, E., 2000, Electromagnetic methods applied to exploration for deep nickel sulphides in the Leinster area, Western Australia: Exploration Geophysics 31, 222-228.
Wolfgram, P. and Golden, H., 2001, Airborne EM applied to sulphide nickel - examples and analsis, Exploration Geophysics 32, 136-140.
Wolfgram, P. and Karlik, G, 1995, Conductivity-depth transform of GEOTEM data: Exploration Geophysics 26, 179-185, with discussion by Peter Wolfgram: Exploration Geophysics 26, 549.

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Article Type: Research Article

Keyword(s): 2D inversion; airborne electromagnetics; conductivity section

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