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Stockage du CO2 dans les aquifères profonds : étude en conditions réelles des propriétés de confinement des roches de couverture et de leur altération

Abstract : A promising solution to reduce anthropogenic emissions of greenhouse effect gases consists in the injection and long-term storage of a part of the industrial carbon dioxide discharges in underground formations. These formations must be composed of a reservoir surrounded by tight caprocks, which represent the first barrier preventing fluids migration. The characterization of their confining properties and of their evolution in presence of CO2 is thus a key element regarding a storage site security. This work presents a methodology allowing the measurement of caprocks transport parameters and the consequences of an alteration under representative conditions of deep aquifers storage. This methodology was applied to carbonate rocks from the Paris basin. The breakthrough pressure, the diffusion coefficient of CO2 dissolution products, and the permeability, controlling parameters of leakage mechanisms, were measured before and after alteration of the materials by reaction with a CO2-saturated brine under reservoir thermodynamic conditions (about 80°C and 100 bar). Results revealed a satisfactory global behaviour under these aggressive conditions, but also a strong diminution of the confinement potential in presence of initial structural faults (sealed fractures, large-diameter pores) forming higher-permeability zones. A numeric simulation describing the evolution of a homogeneous rock formation during 1000 years was also realized based on parameters directly measured or obtained by modelling of the alteration experiments. It showed that the transformations brought by the CO2 storage under a rock formation with no initial faults remain very localized spatially
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Pierre Bachaud. Stockage du CO2 dans les aquifères profonds : étude en conditions réelles des propriétés de confinement des roches de couverture et de leur altération. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL084N⟩. ⟨tel-01749436⟩

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