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A Topological Approach for Automated Unstructured Meshing of Complex Reservoir

Abstract : The estimation of petroleum reserves entails complex fluid simulations mostly based on finite volume methods. These simulations are operated on 3D meshed reservoir models produced by a complex and poorly automated chain of operations. This paper proposes a mesh building methodology, which uses geological rules for building reservoir meshes in a semi-automated way. We start from a surface structural model and a description of the stratigraphy bundled together thanks to the industry standard RESQML. We construct a structural framework based on generalized map topological structures. These structures include topological boundary relations between the represented geological objects (horizons, faults, units) and some dedicated data attached to the topological cells (vertices, faces, volumes, etc.), such as geometry or geological labels (e.g. names, relative ages, deposit methods). In particular, on a single topological representation, we can attach two different geometric representations that respectively describe the present-day layer geometry and the original positions of the various layers in their " deposition space ". Using a dedicated rule-based language, we introduce a set of topological and geometric operations based on the geological interpretation that allow an automated building of the structural framework, on which the reservoir meshes will be implemented. This language allows a fast prototyping of complex operations (boolean operations for instance) and it guarantees the geological and topological model consistency. From this fully consistent structural framework, we can automatically create various conformal unstructured 3D meshes organized in layers. These meshes agree both with the topology induced by the succession of deposition, erosion and tectonic events that constitute the local geological history, and with the peculiarities of the used fluid flow simulators. A use-case is presented to demonstrate the feasibility of our method.
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Submitted on : Monday, June 18, 2018 - 2:28:25 PM
Last modification on : Wednesday, December 22, 2021 - 11:58:08 AM


  • HAL Id : hal-01789851, version 1


Valentin Gauthier, Agnès Arnould, Hakim Belhaouari, Sébastien Horna, Michel Perrin, et al.. A Topological Approach for Automated Unstructured Meshing of Complex Reservoir. 15th European Conference on the Mathematics of Oil Recovery 2016 (ECMOR XV), Aug 2016, Amsterdam, Netherlands. ⟨hal-01789851⟩



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