Quasi-3D inversion of full size AEM datasets

Esben Auken; Gianluca Fiandaca; Casper Kirkegaard; Anders Vest Christiansen

doi:10.1071/ASEG2015ab106

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Quasi-3D inversion of full size AEM datasets
Authors Esben Auken^a, Gianluca Fiandaca^b, Casper Kirkegaard^c and Anders Vest Christiansen^d
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^a Aarhus University, C.F. Moellers Alle 4 8000, Aarhus, C - DK [email protected] ^b Aarhus University, C.F. Moellers Alle 4 8000, Aarhus C, - DK [email protected] ^c Aarhus University, C.F. Moellers Alle 4 8000, Aarhus C, - DK [email protected] ^d Aarhus University, C.F. Moellers Alle 4 8000, Aarhus C, - DK [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2015ab106
- Published online: 01 Dec 2015

Abstract

We present a new algorithm for quasi-3D inversion of airborne transient electromagnetic data (AEM). The algorithm uses a 3D voxel grid for the model domain while the forward response and derivatives are calculated using interpolated “virtual” 1D models collocated at the AEM measurement points. The algorithm efficiently decouples the model domain from the practical spatial sampling which are often dictated by the landscape, ground installations ect., rather than the optimal model resolution. The algorithm uses sparse storage with efficient solvers and it scales linearly both with the number of CPU’s and with the survey size. This means that it can be used to invert entire surveys of thousands of kilometres on small multiprocessor servers priced less than 5000 Euro. The algorithm allows inputting a-priori information from boreholes, joint inversion with groundbased electrical/electromagnetic data and modelling of flight altitude and shift parameters.

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2015-12-01

2026-01-17

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References

Auken, E. and Christiansen, A. V., 2004, Layered and laterally constrained 2D inversion of resistivity data: Geophysics, 69, 752-761.
Auken, E., Christiansen, A. V., Jacobsen, B. H., Foged, N., and Serensen, K. I., 2005, Piecewise 1D Laterally Constrained Inversion of resistivity data: Geophysical Prospecting, 53, 497-506.
Auken, E., Christiansen, A. V., Jacobsen, L., and Serensen, K. I., 2008, A resolution study of buried valleys using laterally constrained inversion of TEM data: Journal of Applied Geophysics., 65, 10-20.
Auken E., Christiansen A.V, Kirkegaard C., Fiandaca G., Schamper C., Behroozmand A., Binley A., Nielsen E., Efferse F., Christensen N., Foged N., Vignoli G, 2014, An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data. Exploration Geophysics, http://dx.doi.org/10.1071/EG13097.
Behroozmand, A. A., Auken, E., Fiandaca, G., and Christiansen, A. V., 2012a, Improvement in MRS parameter estimation by joint and laterally constrained inversion of MRS and TEM data: Geophysics, 74, WB191-WB200.
Behroozmand, A. A., Auken, E., Fiandaca, G., Christiansen, A. V., and Christensen, N. B., 2012b, Efficient full decay inversion of MRS data with a stretched-exponential approximation of the T2* distribution: Geophysical Journal International, 190, 900-912.
Christiansen, A. V., Auken, E., Foged, N., and Serensen, K. I., 2007, Mutually and laterally constrained inversion of CVES and TEM data - A case study: Near Surface Geophysics, 5, 115-124.
Fiandaca, G., Auken, E., Gazoty, A., and Christiansen, A. V., 2012, Time-domain induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters: Geophysics, 77, E213-E225.
Fiandaca, G., Ramm, J., Binley, A., Gazoty, A., Christiansen, A. V., and Auken, E., 2013, Resolving spectral information from time domain induced polarization data through 2-D inversion: Geophysical Journal International, 192, 631-646.
Siemon, B., Auken, E., and Christiansen, A. V., 2009, Laterally constrained inversion of helicopter-borne frequency-domain electromagnetic data: J. Appl. Geophys., 67, 259-268. Wisen, R. and Christiansen, A. V., 2005, Laterally and Mutually Constrained Inversion of Surface Wave Seismic Data and Resistivity Data: Journal of Environmental & Engineering Geophysics, 10, 251-262.
Viezzoli A., Christiansen A.V., Auken E., Serensen K., 2008, Quasi-3D modeling of airborne TEM data by spatially constrained inversion. Geophysics, 73(3), F105-F113.

/content/journals/10.1071/ASEG2015ab106

Article Type: Research Article

Keyword(s): 3D inversion; AEM; airborne electromagnetic; TEM; trans ient electromagnetic

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