Modélisation volumique, contraintes et libertés

Abstract : In the upstream oil and gas industry, 3D earth models are crucial for decision making and various purposes. They help for example to monitore the reservoir (4D seismic). It is rare at present that a full suite of technologies from seismic to reservoir flow simulation is applied in a single study. Each new campaign or new wells may invalidate the 3D earth model. Editing and updating a 3D earth model in a rapid and fully interactive approach is needed more than ever. Editing a 3D Earth Model raises many different problems. Suppose in a structural model, you realize the upthrown surfaces need less amplitude than you first gave them. If you shift them downward, you will create a gap between them and the normal fault. Somehow, you need to extend the surfaces to fill the gaps. You will also notice «scars» on the fault; these mark the original positions of the fault/surface contacts. We have to remove these needless scars remaining by mending the fault. Another problem is associated to the computation of intersection between surfaces. Generating an intersection between a horizon and a fault consists in sharing the same geometrical and topological contact along the line of intersection and creating small triangles. From this fact, attempts to run algorithms on poorly surfaces are often unsuccessful unless we enhance the beauty of the mesh near the intersections.
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Nicolas Euler. Modélisation volumique, contraintes et libertés. Sciences de la Terre. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL134N⟩. ⟨tel-01749904⟩

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