3D land CSEM with a single transmitter position

François Bretaudeau 1 Nicolas Coppo 1 Pierre Wawrzyniak 1 Sebastien Penz 1
1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
Abstract : Anthropogenic noise, cost and logistical constrains generally limit to the use of land CSEM to a single transmitter position for the deep imaging of the electrical conductivity. As the inversion of CSEM data in the near field using a single transmitter position suffers from critical sensitivity singularities, we proposed a robust inversion framework adapted to this ill-conditioned inversion problem. The framework relies specifically on a robust Gauss-Newton solver, several model parameter transformations to compensate for the heterogeneous sensitivities, and on the reformulation of the CSEM data under the form of a pseudo- MT tensor. We describe here the approach used for modelling and inversion implemented in our code POLYEM3D and the new pseudo-MT formulation. We illustrate its application on a pathological synthetic case inspired from Grayver et al. (2013) and then show the application of the process to a real CSEM dataset acquired in the context of thermal water prospection.
Keywords : resistivity imaging CSEM 3D inversion
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Soumis le : lundi 29 mai 2017 - 14:39:23
Dernière modification le : vendredi 4 août 2017 - 01:04:22
Document(s) archivé(s) le : mercredi 6 septembre 2017 - 11:03:01

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François Bretaudeau, Nicolas Coppo, Pierre Wawrzyniak, Sebastien Penz. 3D land CSEM with a single transmitter position. 79th EAGE Conference and Exhibition 2017, Jun 2017, Paris, France. Proceedings of the 79th EAGE Conference and Exhibition 2017 in Paris. 〈hal-01528671〉

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