Caractérisation et modélisation numériques tridimensionnelles des réseaux de fractures naturelles : application au cas des réservoirs

Abstract : Natural fractures have a dramatic impact on reservoirs either in fields such as mining and petroleum engineering or hydrogeology. Indeed, acting as conductors or barriers, they often control the flow and also the storage capacity in such reservoirs. The presented work is enclosed in the numerical modelling line of naturally fractured reservoirs, addressing the specific issues of characterizing and modelling fractures in three dimensions. The proposed approaches successively deal with the first logical stages of this modelling: 1. Natural fractures characterization from structural data: a geomechanical and probabilistic approach in three dimensions integrates tensorial strain data (obtained from forward or backward modelling techniques) in order to compute new structural drivers of fracturing intensity and orientation. The proposed mathematical framework also account for petrophysical rock property uncertainties. 2. Numerical fracture network modelling: a discrete fracture network modelling approach in three dimensions was developed because of its flexibility and its realism. A numerical stochastic simulation enables to model any kind of fracture network while honouring field data and predefined geological constraints (such as strata confinement, relative chronology between several fracture systems, etc.). 3. Connectivity analysis of discrete fracture networks: a graph structure highlights the connectivity relationships between the discrete fractures of a three-dimensional network. Several connectivity analysis methods, qualitative and quantitative, are then outlined with an emphasis on their improvement on understanding of the fracturing impact on fluid flows
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Laetitia Macé. Caractérisation et modélisation numériques tridimensionnelles des réseaux de fractures naturelles : application au cas des réservoirs. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL022N⟩. ⟨tel-01752555⟩

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