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TitleA finite-element based algorithm for 3D magnetotelluric inversion using unstructured meshes for complex geological settings
AuthorAnsari, S M; Craven, J; Schetselaar, EORCID logo; Farquharson, C
Source80th EAGE Conference & Exhibition 2018, technical programme; by European Association of Geoscientists and Engineers; 2018 p. 1-5
Alt SeriesNatural Resources Canada, Contribution Series 20190146
PublisherEuropean Association of Geoscientists and Engineers
Meeting80th EAGE Annual Conference & Exhibition 2018 (European Association of Geoscientists and Engineers); Copenhagen; DK; June 11-14, 2018
File formatpdf (Adobe® Reader®)
Subjectsgeophysics; Science and Technology; geophysical interpretations; magnetotelluric interpretations; models; modelling; conductivity; Methodology
Illustrationsmodels; 3-D models; plots
ProgramTargeted Geoscience Initiative (TGI-5)
Released2018 06 01
An inversion methodology and algorithm is developed for inverting Magnetotelluric data for three-dimensional Earth conductivity models meshed using unstructured grids. The forward modeling subset of the inversion method is implemented using the E-field vectorial finite-element method for layered or homogeneous Earth models and complex target geometries. The inversion is based on the iterative linearized Gauss-Newton approach with the Jacobian matrix-vector operations calculated implicitly for the sake of memory and storage efficiency. The algorithm is parallelized for multiple frequencies and demonstrated to be feasible in terms of computation time and model accuracy. Preliminary results due to a successful implementation of the algorithm is shown for the Commei 3D-2A model.

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