Inversion of surface and downhole electromagnetic data for a 3D earth

David Annetts

doi:10.1071/ASEG2012ab158

ISSN: 2202-0586
E-ISSN:

oa Inversion of surface and downhole electromagnetic data for a 3D earth
Authors David Annetts^a
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^a CSIRO ESRE, 26 Dick Perry Avenue, KENSINGTON, , 6151, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2012ab158
- Published online: 01 Dec 2012

Abstract

Summary

A program described by Sugeng [1998] which calculates the full domain 3D EM response of an earth modelled by hexahedral finite elements was extended to invert ground survey data using the damped eigenparameter method described by Jupp and Vozoff [1975].

The program is demonstrated using a small numerical model of a SIROTEM-like fixed-loop survey consisting of three surface traverses and a downhole line. Results suggest that provided data are not too noisy, a reasonable model can be recovered if the starting model is quite close to the true model. This suggests that the program might best be used to inverse-model particular features of interest rather than as a starting point for interpretation.

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2012-12-01

2026-01-25

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References

Ellis, R. G. (1998), Inversion of airborne electromagnetic data, Explor. Geophys., 29(2), 121-127.
Jupp, D. L. B., and K. Vozoff (1975), Stable Interative Methods for the inversion of Geophysical Data, Geophys. J. R. Astr. Soc., 42, 957-976.
Raiche, A. P., D. L. B. Jupp, H. Rutter, and K. Vozoff (1985), The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures, Geophysics, 50(10), 1618-1627.
Sugeng, F. (1998), Modeling the 3D TDEM response using the 3D full-domain finite-element method based on the hexahedral edge-element technique, Exploration Geophysics, 29(4), 615-619.
Sugeng, F., A. Raiche, and G. Wilson (2006), An efficient compact finite-element modelling method for the practical 3D inversion of electromagnetic data from high contrast complex structures, in 18th workshop on Electromagnetic Induction in the Earth, El Vendrell, Spain.
Wilson, G. ., A. P. Raiche, and F. Sugeng (2006), 2.5D inversion of airborne electromagnetic data, Exploration Geophysics, 37(4), 363-371.

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Article Type: Research Article

Keyword(s): 3D; downhole; electromagnetic; ground; inversion

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oa Inversion of surface and downhole electromagnetic data for a 3D earth

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