%0 Conference Proceedings
%T 3D land CSEM inversion in noisy environment with a single transmiter: inversion approach and application for geothermal water prospection
%+ Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
%A Bretaudeau, François
%A Penz, Sebastien
%A Coppo, Nicolas
%A Wawrzyniak, Pierre
%A Darnet, Mathieu
%< avec comité de lecture
%B International Symposium in Three-Dimensional Electromagnetics (3DEM)
%C Berkeley, United States
%8 2017-03-28
%D 2017
%K 3D inversion
%K land CSEM
%K noisy environment
%K single transmiter
%K sensitivity singularities
%K thermal water prospection
%Z Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
%Z Mathematics [math]/Optimization and Control [math.OC]Conference papers
%X Anthropogenic noise, cost and logistical constrains generaly limit to the use of land CSEM to a few transmiter positions for the deep imaging of the electrical conductivity. The 3D inversion of CSEM data in the near field using a single transmiter position suffers from critical sensitivity singularities. We proposed a robust inversion framework adapted to this ill-conditioned inversion problem. The framework relies specificaly on a robust Gauss-Newton solver, model parameter transformations to compensate the heterogeneous sensitivies, and on the reformulation of the near field CSEM data under the form of a pseudo-MT tensor. We describe the approach used for modeling and inversion implemented in our code POLYEM3D and show the advantages of pseudo-MT tensor formulation. The strategy have been tested on a pathologic synthetic case inspired from grayver et al (2013), and then was successfully applied to a real CSEM dataset acquired in the context of thermal water prospection in a noisy environnement.
%G English
%2 https://brgm.hal.science/hal-01458151/document
%2 https://brgm.hal.science/hal-01458151/file/Bretaudeau-2017-EM3D-6-Berkeley.pdf
%L hal-01458151
%U https://brgm.hal.science/hal-01458151
%~ BRGM
%~ INSMI
%~ OPENAIRE
%~ GENCI
%~ TDS-MACS