Practical 3D AEM inversion using 2.5D modelling

Glenn Wilson; Art Raiche; Fred Sugeng

doi:10.1071/ASEG2006ab196

ISSN: 2202-0586
E-ISSN:

oa Practical 3D AEM inversion using 2.5D modelling
Authors Glenn Wilson^a, Art Raiche^b and Fred Sugeng^c
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^a CSlRO Exploratbn and Mining, PO Box 136 North Ryde, NSW, 1670, Australia, [email protected] ^b CSlRO Exploratbn and Mining, PO Box 136 North Ryde, NSW, 1670, Australia, [email protected] ^c CSlRO Exploratbn and Mining, PO Box 136 North Ryde, NSW, 1670, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab196
- Published online: 01 Dec 2006

Abstract

2.5D electromagnetic (EM) modelling computes the response due to a 3D source from an arbitrary 2D geoelectrical model which has an infinite strike length. As such, airborne EM (AEM) data can be inverted using 2.5D modelling provided that the geoelectrical cross-section is relatively constant along a strike length that exceeds the AEM system footprint. The program ArjunAir is introduced for modelling and inversion based on a 2D finite-element method that enables the accurate simulation of 3D source excitation for full domain models inclusive of topography, non-conforming boundaries and very high resistivity contrasts. Inversion is based on an iterative Gauss-Newton method that is solved using the damped eigenparameter algorithm. Examples are presented for synthetic frequency and time-domain AEM surveys for which inversion runtimes are in the order of hours.

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2006-12-01

2026-01-20

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References

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Chen, I, Raiche, A., Sugeng, F., and Macnae, I, 1998, 2.5D conductivity inversion of airborne EM data: 68th Meeting, SEG, New Orleans LA, Expanded Abstracts, 756-759.
Ellis, R. G., 1995, Joint 3D EM inversion: International Symposium on Three-Dimensional Electromagnetics, Ridgefield CT, Expanded Abstracts, 307-323.
Jupp, D. L. B., and Vozoff, K., 1975, Stable iterative methods for geophysical inversion: Geophysical Journal of the Royal Astronomical Society 42, 55-72.
Hohmann, G. W., and Raiche, A. P., 1988, Inversion of controlled-source electromagnetic data, in M. N. Nabighian (Ed.), Electromagnetic Methods in Applied Geophysics 1, SEG, 469-503.
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Raiche, A., 1998, Modelling the time-domain response of AEM systems: Exploration Geophysics 29, 103-106.
Raiche, A. P., Jupp, D. L. B., Rutter, H., and Vozoff, K., 1985, The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures: Geophysics 50, 1618-1627.
Raiche, A., Sugeng, F., and Annetts, D., 2001, Finding targets in complex hosts using airborne EM: 15th ASEG Geophysical Conference & Exhibition, Brisbane QLD.
Raiche, A., Wilson, G., and Sugeng, F., 2006, Practical 3D AEM inversion using thin-sheet models: Australian Earth Science Convention, Melbourne VIC.
Sugeng, F., Raiche, A. P., and Rijo, L., 1992, Comparing the time-domain EM response of 2-D and elongated 3-D conductors excited by a rectangular loop source: Journal of Geomagnetism and Geoelectricity 45, 873-885.
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Article Type: Research Article

Keyword(s): 2.5D; airborne; electromagnetic; finite-elements; inversion; modelling

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oa Practical 3D AEM inversion using 2.5D modelling

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