Estimation of Thermodynamics and Chemical Kinetics Parameters at Different Scales for the Models of CO2 Storage

The present work is based on the study of the water-gas-rock interactions in the case of CO2 storage in geological environment. The focus is on the scale of observation geochemical phenomena while taking into account the heterogeneity of the reservoir. This heterogeneity at small and large scale helps to maintain a local variability of the chemical composition of the fluid and influence reaction rates at the pore as well as at the reservoir scale We propose to evaluate the geostatistical characteristics of local variability thanks to simulations of reactive transport on a small scale in which parameters (namely the equilibrium constants log K and the rate constant k) are perturbed to represent local processes.