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An Original and Useful Approach to Mesh a Discrete Fracture Network Using a Delaunay Triangulation: Application on Flow and Transport Upscaling from Characterization Scale to Reservoir Scale

Abstract : Modeling mass and heat transfers in fractured media is a challenge. That is due to the geometrical complexity of the discrete fracture network (DFN) and the remaining input data uncertainties. As an illustration, in the field of CO2 sequestration or oil reservoir production, transfers have to be modeled at the scale of reservoirs (10km*10km) using 100m*100m*10m grid cell sizes. However, fractures are finely characterized on well logs and outcrops (at a scale of few meters). From this characterization a DFN can be built and may contain over 10\⁶ fractures. Analogous issues are to be adressed for hydrology and geothermal applications. Direct numerical simulations taking into account the DFN geometry remain still impossible at the reservoir scale. In practice, upscaling approaches are used to determine equivalent transfer parameters at the grid cell scale. The number of fractures belonging to a grid cell and respecting data from characterization scale may be close to 10\³ fractures. This number is more tractable and direct numerical simulation may be used at this step. Nevertheless, considering the complexity of the DFN geometry, it still remains to simplify the DFN mesh, considering assumptions about the details of the flow. In order to test the accuracy of these assumptions, reference numerical simulations must be carried-out using a mesh which accounts for the detailed DFN geometry. The goal of this paper is to present an original 3D DFN mesh approach allowing to get high fidelity reference simulations and allowing to test further simplifications required
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https://hal-univ-pau.archives-ouvertes.fr/hal-02153993
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Submitted on : Wednesday, June 12, 2019 - 4:13:04 PM
Last modification on : Thursday, March 5, 2020 - 7:13:25 PM

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André Fourno, Benoit Noetinger, Christian La Borderie. An Original and Useful Approach to Mesh a Discrete Fracture Network Using a Delaunay Triangulation: Application on Flow and Transport Upscaling from Characterization Scale to Reservoir Scale. CMWR 2016, Jun 2016, Toronto, Canada, Canada. ⟨hal-02153993⟩

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