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Évolution des propriétés pétrophysiques d'écoulement pendant une injection de CO² et impact induit au niveau de l'injectivité

Abstract : The geological storage of CO² is considered as an attractive option to reduce the greenhouse gas emissions in the atmosphere. CO² is not an inert gas, however. Its dissolution in brine forms a weak acid that has the potential to react with the host rock formation. The induced pores structure modification impacts the flow properties. Thus, to ensure the viability and sustainability of CO² storage, operators need simulations that take into account the specificities of reactive transport. However, the macroscopic coefficients of the reactive transport equation are modified from the values of an inert tracer by surface reactions. These specificities due to mass transfer are currently not considered. Similarly, the permeability-porosity (K-F) relationship is only estimated semi-empirically. The aim of this thesis was to develop a method to obtain the macroscopic coefficients and the K-F laws, by solving the equations governing the pore-scale phenomena. To do this, we used the Pore Network Modelling approach (PNM). The advantage of the PNM is that it explicitly takes into account the pore structure, while conceptualizing the latter to a set of pores and throats whose morphology is simplified into spheres or cylinders for instance. The study is based into two successive upscalings: from local-scale to pore-scale, then from pore-scale to core-scale. The reactive transport problem is solved for basic elements, analytically or numerically. Then, using the solutions previously found at the pore scale, the reactive transport phenomena are treated throughout the network. Our model was validated by observations on micromodels and by a comparison with an acid-induced alteration experiment
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Lionnel Algive. Évolution des propriétés pétrophysiques d'écoulement pendant une injection de CO² et impact induit au niveau de l'injectivité. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL072N⟩. ⟨tel-01748736⟩

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