Modélisation d'objets sédimentaires par des surfaces paramétriques et application à l'analyse d'image

Abstract : Most clastic deposits consist in geometric arrangements of several structures. The purpose of this work is to provide a volumetric representation of these objects in order to reproduce the high heterogeneity of the sedimentary deposits. These models are constructed to be flexible and compact in order to model the sedimentary formations at different scales. The sedimentary models are defined by a boundary representation ; each boundary is defined by a deformable parametric surface. The proposed parametrization is the Non Uniform Rational B-Spline (NURBS). Each elementary shape is controlled by deformation rules and has connection constraints with associated objects, in order to maintain the geometry and the consistency through editing. Sedimentary structure models are applied to channel simulation and to the construction of the related structures such as point bars. These structures are then used as framework for petrophysical property simulations. The models are also applied to semi-automatically interpret geological images by adapting classical shape extraction methods. This approach is applied on satellite pictures showing alluvial channels and some preliminary results on 3D seismic time slices are also presented
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Jérémy Ruiu. Modélisation d'objets sédimentaires par des surfaces paramétriques et application à l'analyse d'image. Sciences de la Terre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0343⟩. ⟨tel-01754643⟩

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