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Theses

Analyse des propriétés hydrauliques
des réseaux de fractures
Discussion des modèles d'écoulement compatibles
avec les principales propriétés géométriques

Abstract : Fractured medium are studied in the general framework of oil and water supply and more recently for the underground storage of high level nuclear wastes. As fractures are generally far more permeable than the embedding medium, flow is highly channelled in a complex network of fractures. The complexity of the network comes from the broad distributions of fracture length and permeability at the fracture scale and appears through the increase of the equivalent permeability at the network scale. The goal of this thesis is to develop models of fracture networks consistent with both local-scale and global-scale observations.
Bidimensional models of fracture networks display a wide variety of flow structures ranging from the sole permeable fracture to the equivalent homogeneous medium. The type of the relevant structure depends not only on the density and the length and aperture distributions but also on the observation scale. In several models, a crossover scale separates complex structures highly channelled from more distributed and homogeneous-like flow patterns at larger scales. These models, built on local characteristics and validated by global properties, have been settled in steady state. They have also been compared to natural well test data obtained in Ploemeur (Morbihan) in transient state. The good agreement between models and data reinforces the relevance of the models. Once validated and calibrated, the models are used to estimate the global tendencies of the main flow properties and the risk associated with the relative lack of data on natural fractures media.
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https://tel.archives-ouvertes.fr/tel-00135820
Contributor : Jean-Raynald de Dreuzy <>
Submitted on : Friday, March 9, 2007 - 7:04:32 AM
Last modification on : Thursday, January 14, 2021 - 11:47:06 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 10:28:26 PM

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  • HAL Id : tel-00135820, version 1

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Jean-Raynald de Dreuzy. Analyse des propriétés hydrauliques
des réseaux de fractures
Discussion des modèles d'écoulement compatibles
avec les principales propriétés géométriques. Hydrologie. Université Rennes 1, 1999. Français. ⟨tel-00135820⟩

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