Patent ID: 7664624

Claim:
A computer-implemented method for determining the capacities of an underground geologic medium for storage of at least one acid gas, the underground geologic medium comprising a solid phase and an aqueous phase, characterized in that the method comprises the following steps: a) dividing said underground geologic medium into a set of sub-volumes referred to as cells; b) defining a multiphase reactive transport model by coupling: (i) a sub-model of a compositional multiphase reservoir, that is dedicated to determination of the transfer rates linked with the at least one acid gas, with (ii) a sub-model of a single-phase reactive transport, that is dedicated to determination of the transfer rates linked with said aqueous phase and said solid phase; c) carrying out data acquisition so as to initialize said multiphase reactive transport model; d) determining through computer-implemented calculations, for a given time period t, values for chemical constituents transport processes and chemical reaction processes within said underground geologic medium, by solving said multiphase reactive transport model at any cell of said underground geologic medium, so as to obtain at least the following values: (i) an amount of the at least one acid gas present in said underground geologic medium, that have at least one of (1) migrated outside said underground geologic medium and to the surface and (2) precipitated and dissolved in the aqueous phase, and (ii) an amount of the solid phase alterations caused by precipitation and dissolution; e) outputting the results of step d); f) deducing therefrom the capacities of said underground geologic medium for storing the at least one gas.