Gestion de la complexité géologique en restauration géomécanique 3D

Abstract : Restoration is a structural geology tool which usefulness has been shown in various fields, such as the understanding of deformation mechanisms, fracture forecasting, or structural models validation. In 3D, the geomechanical approach is particularly promising as it allows the deformation at any point in the model to be infered, but also to account for material property contrasts. However, it requires to generate a tetrahedral mesh, a step that may be, so far, extremely difficult, particularly when the geometry of the model is complex (interconnected faults, faults with small throws, unconformities or layer pinch-out).Implicit modeling consists in representing stratigraphic horizons by property isovalues, allowing most meshing issues to be overcame. In a first part, a geomechanical restoration method suitable for implicit models is presented. The second part of this work focuses on the application of this method to complex cases. New behavioral laws and boundary conditions have been developed, and sensitivity studies to these parameters have been performed. This work is applied to a petroleum basin located in the Niger delta toe where the restoration allows the structural evolution of the system to be constrained. The last part presents the integration of a 3D isostatic decompaction method into the 3D restoration process. Applied to the Annot Sandstones syncline (SE France), this method allows to characterize the deformation and burial history of the basin
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Pauline Durand-Riard. Gestion de la complexité géologique en restauration géomécanique 3D. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL055N⟩. ⟨tel-01748838⟩

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