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Poromechanics of Salt Nucleation within an Unsaturated Reservoir Rock

The aim of this study is to estimate the stress induced by salt crystallization in a reservoir rock during an injection of supercritical CO2 operation. A ”pore-scale” model is used to calculate the nucleation and growth of salt crystals within brine solution submitted to a drying out process. The induced crystallization pressure is then estimated through a generalized Correns law. This information is finally imported into a poromechanical model that allows calculating the local strain induced by the crystallization process. The stress state within a representative elementary volume of the host rock is then estimated through the equivalent tensile stress to which the solid matrix of the rock is subjected.