%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