Modelling the Dissolution/Precipitation of Ideal Solid Solutions

E. Nourtier-Mazauric 1, 2, 3 Bernard Guy 1, 2, 3 B. Fritz 4 E. Brosse 5 Daniel Garcia 1, 2, 3 A. Clément 4
1 GENERIC-ENSMSE - Département Géochimie, environnement, écoulement, réacteurs industriels et cristallisation
2 LMV-ENSMSE - Laboratoire Magmas et Volcans
Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, SPIN, CNRS - Centre National de la Recherche Scientifique : UMR6524, LMV - Laboratoire Magmas et Volcans : UMR 6524
3 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
4 CGS - Centre de géochimie de la surface
5 IFPEN - IFP Energies nouvelles
Abstract : The kinetic behaviour of an ideal solid solution is modelled by two competing reactions: the stoichiometric dissolution of the existing solid and the precipitation of the least soluble compound, i.e. that with respect to which the oversaturation of the fluid is maximum; both reaction rates are expressed as a function of the corresponding departure from equilibrium, with a pH-dependent kinetic constant. Within this ideal model, the saturation curves and the fluid evolution of a simple reacting system may be displayed conveniently in chemical potential diagrams. The simulation of a geochemical system, constituted of a glauconitic sandstone aquifer infiltrated through by a sea water enriched in carbonates, allows to analyze the impact of taking into account two ferro-magnesian solid solutions, a calcite and a chlorite, on Fe-Mg exchanges during carbonates dissolution. The model accounts well for the tendency of solid solutions to dissolve congruently before precipitation starts and drives the fluid composition towards equilibrium.
keyword : stoichiometric dissolution Ideal Solid Dissolution Precipitation
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Article dans une revue
Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2005, 60 (2), pp.401-415. 〈10.2516/ogst:2005024〉
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Soumis le : mercredi 13 février 2019 - 09:36:01
Dernière modification le : mercredi 27 février 2019 - 01:17:05

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E. Nourtier-Mazauric, Bernard Guy, B. Fritz, E. Brosse, Daniel Garcia, et al.. Modelling the Dissolution/Precipitation of Ideal Solid Solutions. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2005, 60 (2), pp.401-415. 〈10.2516/ogst:2005024〉. 〈emse-00613150〉

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