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Influence of spatial variability on reactive transport

Abstract : The study aims at quantifying the effects of spatial variability of a porous medium on the evolution of a geochemical system. Mineral dissolution or precipitation reactions can modify the pore structure of the medium, hence a modification of the hydrodynamic properties, notably permeability. Is it possible then that the initial spatial variability can lead to the formation of fingering? The first part of the document deals with upscaling, from a fine geostatistical grid to a coarse reactive transport grid. For the code HYTEC, based on Voronoi polygons, several methods of equivalent permeability are compared, following several criterion. The second part presents reactive transport results on a family of geostatistical simulations of the medium. The influence of spatial variability is quantified using adequate "observables". two disctinct reactions were studied: dissolution, and more rapidly dissolution/precipitation leading to a smoothing of the system.
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https://pastel.archives-ouvertes.fr/pastel-00004649
Contributor : Ecole Mines Paristech <>
Submitted on : Wednesday, January 28, 2009 - 8:00:00 AM
Last modification on : Thursday, September 24, 2020 - 4:34:05 PM
Long-term archiving on: : Thursday, September 30, 2010 - 8:36:15 PM

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  • HAL Id : pastel-00004649, version 1

Citation

Marco de Lucia. Influence of spatial variability on reactive transport. Mathematics [math]. École Nationale Supérieure des Mines de Paris, 2008. Italian. ⟨NNT : 2008ENMP1552⟩. ⟨pastel-00004649⟩

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