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Approche pseudo-génétique pour la simulation stochastique de la géométrie 3D de réseaux fracturés et karstiques

Abstract : Fractures and karstic networks are known to significantly affect flow paths and therefore raise specific issues in a wide variety of geoscience fields. The common question beyond these problems isto determine whether there is a network of fractures and/or karstic conduits and if yes what are itsgeometrical and hydraulic characteristics. Characterization and modeling of these features is a challenge for it usually displays complex geometries and heterogeneous spatial distribution. Moreover, in most cases, neither fracture and karst nor their host environment can be observed or described with certainty at all scales and location of relevance. For these reasons, fractures and karstic networks are usually integrated into 3D geological model through a probabilistic framework. Stochastic object- or pixel-based simulations are commonly performed to generate 3D models of fractures and karst but failed to reproduce the whole complexity of these natural objects and 3D models often lack geological realism.To address the issues related to fracture and karst modeling, we present two genetic-like approaches. The motivation of this work is to constrain the stochastic simulation of fractures and karsts by geometrical and heuristic rules which mimic the physical processes governing their formation. The resulting fracture and karst models display similar characteristics as those of natural pattern.
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Vincent Henrion. Approche pseudo-génétique pour la simulation stochastique de la géométrie 3D de réseaux fracturés et karstiques. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL046N⟩. ⟨tel-01749502⟩

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