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The practical application of 2D inversion to marine controlled-source electromagnetic data

The practical application of 2D inversion to marine controlled-source electromagnetic data
The practical application of 2D inversion to marine controlled-source electromagnetic data
An algorithm is presented for the inversion of marine controlled-source electromagnetic (CSEM) data that uses a 2D finite difference (FD) forward driver. This code is demonstrated by inverting a CSEM data set collected at Hydrate Ridge, Oregon, consisting of 25 seafloor sites recording a 5-Hz transmission frequency. The sites are located across a bathymetric high, with variations in water depth of ?300m along the 16-km profile. To model this complex seafloor bathymetry accurately, the FD grid was designed by careful benchmarking using a different 2D finite element (FE) forward code. A comparison of the FE and FD forward model solutions verifies that no features in the inversion are due to inaccuracies of the FD grid. The inversion includes the local seawater conductivity–depth profile as recorded by the transmitter’s conductivity–temperature-depth gauge, because seawater conductivity is known to have a significant effect on the CSEM responses. An apparent resistivity pseudosection of the CSEM data resembles the 2D inversion in general appearance. However, the inversion provides depth and geometric control of features that cannot be provided by the pseudosection and eliminates artifacts generated from the pseudosection projection.
0016-8033
F199-F211
Weitemeyer, Karen
22c524f6-b24d-4d2a-a46d-16b06c70a5d1
Gao, Guozhong
c16e9246-2960-4aaf-a9b6-2c92ac8e5965
Constable, Steven
f2ffd9c4-3738-435b-8a88-38dee97de7cc
Alumbaugh, David
c3c4f1f8-a4fb-4373-a39c-502fde7f8ea4
Weitemeyer, Karen
22c524f6-b24d-4d2a-a46d-16b06c70a5d1
Gao, Guozhong
c16e9246-2960-4aaf-a9b6-2c92ac8e5965
Constable, Steven
f2ffd9c4-3738-435b-8a88-38dee97de7cc
Alumbaugh, David
c3c4f1f8-a4fb-4373-a39c-502fde7f8ea4

Weitemeyer, Karen, Gao, Guozhong, Constable, Steven and Alumbaugh, David (2010) The practical application of 2D inversion to marine controlled-source electromagnetic data. Geophysics, 75 (6), F199-F211. (doi:10.1190/1.3506004).

Record type: Article

Abstract

An algorithm is presented for the inversion of marine controlled-source electromagnetic (CSEM) data that uses a 2D finite difference (FD) forward driver. This code is demonstrated by inverting a CSEM data set collected at Hydrate Ridge, Oregon, consisting of 25 seafloor sites recording a 5-Hz transmission frequency. The sites are located across a bathymetric high, with variations in water depth of ?300m along the 16-km profile. To model this complex seafloor bathymetry accurately, the FD grid was designed by careful benchmarking using a different 2D finite element (FE) forward code. A comparison of the FE and FD forward model solutions verifies that no features in the inversion are due to inaccuracies of the FD grid. The inversion includes the local seawater conductivity–depth profile as recorded by the transmitter’s conductivity–temperature-depth gauge, because seawater conductivity is known to have a significant effect on the CSEM responses. An apparent resistivity pseudosection of the CSEM data resembles the 2D inversion in general appearance. However, the inversion provides depth and geometric control of features that cannot be provided by the pseudosection and eliminates artifacts generated from the pseudosection projection.

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More information

Published date: November 2010
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 340173
URI: http://eprints.soton.ac.uk/id/eprint/340173
ISSN: 0016-8033
PURE UUID: 9800e86b-87f4-4dfd-851e-0f5b1355a6c9

Catalogue record

Date deposited: 14 Jun 2012 08:50
Last modified: 19 Jul 2019 21:58

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