3D inversion of entire airborne electromagnetic surveys using a moving footprint

Leif H. Cox; Glenn A. Wilson; Michael S. Zhdanov

doi:10.1081/22020586.2010.12041961

ISSN: 2202-0586
E-ISSN:

oa 3D inversion of entire airborne electromagnetic surveys using a moving footprint
Authors Leif H. Cox^a, Glenn A. Wilson^b and Michael S. Zhdanov^c
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^a Montana Tech & TechnoImaging, Butte, , USA, [email protected] ^b TechnoImaging, Salt Lake City, , USA, [email protected] ^c The University of Utah & TechnoImaging, Salt Lake City, , USA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041961
- Published online: 01 Dec 2010

Abstract

Summary

We show that it is practical to invert entire airborne electromagnetic (AEM) surveys to 3D conductivity models with hundreds of thousands of cells within a day on a workstation. We have exploited the fact that the area of the footprint of an AEM system is significantly smaller than the area of an AEM survey to develop a robust 3D inversion method which uses a moving footprint. Our implementation is based on the 3D integral equation method for computing AEM data and sensitivities, and the re-weighted regularized conjugate gradient method is used to minimize the objective functional. Even for terranes which are arguably as close to 1D as geologically possible, we demonstrate that results from our 3D inversion are a significant improvement over those models obtained from layered earth inversion. We demonstrate this with 3D inversion of RESOLVE frequency-domain AEM data acquired for salinity mapping over the Bookpurnong Irrigation District in South Australia.

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References

Cox, L. H. and Zhdanov, M. S., 2007, Large scale 3D inversion of HEM data using a moving footprint: presented at SEG International Exposition and 77th Annual Meeting, San Antonio.
Ellis, R. G., 1998, Inversion of airborne electromagnetic data: Exploration Geophysics, 29, 121-127.
Ellis, R. G., 2002, Electromagnetic inversion using the QMRFFT fast integral equation method: presented at presented at SEG International Exposition and 72nd Annual Meeting, Salt Lake City.
Hursán, G., and Zhdanov, M. S., 2002, Contraction integral equation method in three-dimensional electromagnetic modelling: Radio Science, 37, doi: 10.1029/2001RS002513.
Liu, G., and Becker, A., 1990, Two-dimensional mapping of sea-ice keels with airborne electromagnetic: Geophysics, 55, 239-248.
Munday, T., Fitzpatrick, A., Reid, J., Berens, V., and Sattel, D., 2007, Frequency and/or time-domain HEM systems for defining floodplain processes linked to the salinisation along the Murray River: presented at ASEG 19th Geophysical Conference and Exhibition, Perth.
Raiche, A., Sugeng, F., and Annetts, D., 2001, Finding targets in complex hosts using airborne EM: presented at ASEG 15th Geophysical Conference and Exhibition, Brisbane.
Raiche, A., Sugeng, F., and Wilson, G., 2007, Practical 3D EM inversion – P223F software suite: presented at ASEG 19th Geophysical Conference and Exhibition, Perth.
Reid, J. E., Pfaffling, A., and Vrbancich, J., 2006, Airborne electromagnetic footprints in 1D earths: Geophysics, 71, G63-G72.
Viezzoli, A., Auken, E., and Munday, T., 2009, Spatially constrained inversion for quasi 3D modelling of airborne electromagnetic data – an application for environmental assessment in the Lower Murray Region of South Australia: Exploration Geophysics, 40, 173-183.
Zhdanov, M. S., 2002, Geophysical Inverse Theory and Regularization Problems, Elsevier.
Zhdanov, M. S., and Tartaras, E., 2002, Three-dimensional inversion of multi-transmitter electromagnetic data based on the localized quasi-linear approximation: Geophysical Journal International, 148, 506-519.

/content/journals/10.1081/22020586.2010.12041961

Article Type: Research Article

Keyword(s): 3D; airborne; electromagnetic; footprint; inversion; RESOLVE.

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