Modélisation thermo-hydrodynamique d'un réservoir minier profond ennoyé : le cas du Bassin Houiller Lorrain

Abstract : Since 2006, cessation of dewatering in Lorraine Coal Basin (France) led to the flooding of abandoned mines, resulting in a new hydrodynamical balance in the area. Recent researches concerning geothermal exploitation of flooded reservoirs raised new questions, which we propose to answer. Our work aimed to understand the thermo-hydrodynamical behaviour of mine water in a flooding or flooded system. Firstly, we synthetized the geographical, geological and hydrogeological contexts of the Lorraine Coal Basin, and we chose a specific area for our studies. Secondly, temperature and electric conductivity log profiles were measured in old pits of the Lorraine Coal Basin, giving a better understanding of the water behaviour at a deep mineshaft scale. We were able to build a thermo-hydrodynamical model and simulate water behaviour at this scale. Flow regime stability is also studied. Thirdly, a hydrodynamical spatialized meshed model was realized to study the hydrodynamical behaviour of a mine reservoir as a whole. Observed water-table rise was correctly reproduced : moreover, the model can be used in a predictive way after the flooding. Several tools were tested, improved or developed to ease the study of flooded reservoirs, as three-dimensional upscaling of hydraulic conductivities and a coupled spatialized meshed model with a pipe network
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Guillaume Reichart. Modélisation thermo-hydrodynamique d'un réservoir minier profond ennoyé : le cas du Bassin Houiller Lorrain. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0051⟩. ⟨tel-01751624⟩

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