Modelling the Dissolution/Precipitation of Ideal Solid Solutions

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 uid 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 uid 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 in ltrated 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 uid composition towards equilibrium.
Type de document :
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〉
Liste complète des métadonnées

https://hal-emse.ccsd.cnrs.fr/emse-00613150
Contributeur : Andrée-Aimée Toucas <>
Soumis le : mercredi 3 août 2011 - 09:38:13
Dernière modification le : jeudi 11 janvier 2018 - 06:23:40

Identifiants

Citation

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〉

Partager

Métriques

Consultations de la notice

81