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Contribution à la détermination expérimentale et à la modélisation des différents processus contrôlant l'évolution géochimique, structurale et hydrodynamique des roches fissurées carbonatées

Abstract : This work consisted in the application of X-ray microtomography to the geometry characterisation of fractures subject to dissolution. The aim was to better understand the relationship between geometry changes and flow and transport evolution. The structural observations permitted to highlight the unstable dissolution in fractured medium, which can lead quickly to preferential flow pathway formation associated with a very fast increase in the permeability. The implication of the natural rocks mineralogy and texture also appears to be determining in the evolution of the surface roughness, the transport of the elements towards the water-mineral interface, and the dissolution patterns. Afterwards, the reactive transport software HYTEC was used to highlight the role of the geometry, of the porosity - diffusivity relationship, and of the Damköhler and Peclet numbers in the dissolution pattern evolution and the transport of the species in solution.
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https://pastel.archives-ouvertes.fr/tel-00012048
Contributor : Catherine Noiriel <>
Submitted on : Wednesday, March 29, 2006 - 3:05:26 PM
Last modification on : Thursday, April 9, 2020 - 5:08:12 PM
Document(s) archivé(s) le : Saturday, April 3, 2010 - 8:53:54 PM

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  • HAL Id : tel-00012048, version 1

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Catherine Noiriel. Contribution à la détermination expérimentale et à la modélisation des différents processus contrôlant l'évolution géochimique, structurale et hydrodynamique des roches fissurées carbonatées. Géochimie. École Nationale Supérieure des Mines de Paris, 2005. Français. ⟨tel-00012048⟩

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