Improved imaging of the subsurface using a gravity and magnetotelluric joint inversion

Rachel Maier; Graham Heinson; Mark Tingay; Stewart Greenhalgh

doi:10.1081/22020586.2010.12041896

ISSN: 2202-0586
E-ISSN:

oa Improved imaging of the subsurface using a gravity and magnetotelluric joint inversion
Authors Rachel Maier^a, Graham Heinson^b, Mark Tingay^c and Stewart Greenhalgh^d
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^a The University of Adelaide Mawson Building The University of Adelaide, South Australia, , 5005, [email protected] ^b The University of Adelaide Mawson Building The University of Adelaide, South Australia, , 5005, [email protected] ^c The University of Adelaide Santos Building The University of Adelaide, South Australia, , 5005, [email protected] ^d Institute of GeophysicsETH Zurich, Sonneggstrasse 5 No Building, H48.1 8092, Zurich, Switzerland, [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/10.1081/22020586.2010.12041896
- Published online: 01 Dec 2010

Abstract

Summary

We have developed a petrophysical joint inversion between magnetotellurics (MT) and gravity. It utilises Archie’s Law and the porosity-density relationship. Through these equations it can be shown that both conductivity and density are dependant on porosity. Porosity then forms the crucial link between the two techniques used by the joint inversion.

The approach was tested using synthetic models. The results demonstrate the joint inversion produces a better representation of the subsurface, as compared to individual MT or gravity inversions. It shows sharper boundaries and more accurate parameter values. Our joint inversion is viable in real Earth applications and this was demonstrated through a case study of the Renmark Trough, South Australia.

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2026-01-18

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References

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Rogers, P., 1995, The geology of South Australia. Vol. 2, The Phanerozoic: Mesozoic: Jurrasic-Cretaceous Epicratonic Basins: Berri Basin. South Australia Geological Survey, Bulletin 54, 127-129.
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/content/journals/10.1081/22020586.2010.12041896

Article Type: Research Article

Keyword(s): gravity; joint inversion; magnetotellurics; sedimentary basins

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oa Improved imaging of the subsurface using a gravity and magnetotelluric joint inversion

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