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Etude expérimentale du couplage chimie-mécanique lors de la percolation d'un fluide réactif dans des roches sous contrainte, dans le contexte de la séquestration géologique du CO2.

Abstract : CO2 injection into geological repositories will induce chemical and mechanical instabilities. The study of these instabilities is based on experimental deformation of natural rock samples under stress, in the presence of fluids containing, or not, dissolved CO2.
Triaxial cells used for the experiments permitted an independent control and measurement of stress, temperature, fluid pressure and composition. Vertical strains were measured during several months, with a resolution of 1.10-12 s-1 on the strain rate. Simultaneously, fluids were analysed in order to quantify fluid-rock interactions.
For limestone samples, percolation of CO2-rich fluids increases strain rate by a factor 1.7 up to 5; on the other hand, sandstone deformation remained almost the same. Increase in strain rate with limestone samples was explained by injected water acidification by the CO2 which increases rock solubility and reaction kinetics. On the opposite, small effect of CO2 on quartz explains the absence of deformation. X-ray observations confirmed the importance of rock composition and structure on the porosity evolution. Numerical simulations of rock elastic properties showed increasing shear stress into the sample.
Measured deformation showed an evolution of reservoir rocks mechanical properties. It was interpreted as the consequence of pressure solution mechanisms both at grains contacts and on grain free surfaces.
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Contributor : Yvi Le Guen <>
Submitted on : Wednesday, December 13, 2006 - 12:10:13 AM
Last modification on : Thursday, November 19, 2020 - 3:54:27 PM
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Yvi Le Guen. Etude expérimentale du couplage chimie-mécanique lors de la percolation d'un fluide réactif dans des roches sous contrainte, dans le contexte de la séquestration géologique du CO2.. Géologie appliquée. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00120023⟩

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