Modelling tensor magnetic gradient responses in marine CSEM

David Annetts

doi:10.1081/22020586.2010.12041939

ISSN: 2202-0586
E-ISSN:

oa Modelling tensor magnetic gradient responses in marine CSEM
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 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041939
- Published online: 01 Dec 2010

Abstract

Summary

Conventional marine CSEM and tensor magnetic gradiometer measurements were compared over numerical models of idealised exploration targets in 1 km water columns. It was found that because of their low amplitudes, tensor gradiometer measurements present challenges. When background-normalised data were compared, it was found that tensor magnetic gradient data showed comparable amplitudes. It was also found that one tensor component showed little variation with the underlying model. This suggests that it might be used to estimate a background when seafloor topography or dipping strata are present.

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2026-01-20

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References

Annetts D, Raiche A, Sugeng F. 2004. The time-domain electromagnetic response of wedge-like structures. Preview, 111, 96
Clark D, Young J, Schmidt P. 2009. Magnetic tensor gradiometry in the marine environment: correction of electric and magnetic field and gradient measurements in a conductive medium and improved methods for magnetic target location using the magnetic gradient tensor. MARELEC Conference, Stockholm, Sweden, July 7-9, 2009.
Key K, Lockwood A. 2010. Determining the orientation of marine CSEM receivers using orthogonal Procrustes rotation analysis. Geophysics in press.
Nara T, Suzuki S, Ando S. 2006. A closed-form formula for magnetic dipole localization by measurement of its magnetic field and spatial gradients. IEEE Trans. Mag.42, 3291-3293.
Schmidt P, Clark D, Leslie K, Bick M, Tilbrook D, Foley C. 2004. GETMAG -- A SQUID magnetic tensor gradiometer for mineral and oil exploration. Exploration Geophysics. 35, 297-305.
Xiong Z, Tripp A. 1995. A block iterative algorithm for 3-d electromagnetic modelling using integral equations with symetrized substructures. Geophysics60, 291-295.
Zach JJ, Brauti K. 2009. Methane hydrates in controlledsource electromagnetic surveys - analysis of a recent data example. Geophysical Prospecting, 57, 601-614.

/content/journals/10.1081/22020586.2010.12041939

Article Type: Research Article

Keyword(s): controlled-source; electromagnetic; exploration; gradiometry; hydrocarbon; magnetic; marine; tensor

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