Evaluation of CO2 leakages from an aquifer storage

International audienceThis paper presents preliminary estimations of CO2 overpressure into the reservoir and CO2 leakage through the caprock and the overburden. A simple, two-phase flow model in porous media based on Darcy's law was used, in order to explore easily long time periods. The models allow sensitivity studies and preliminary evaluations of the relations between CO2 leakage (time needed for the CO2 to reach the surface; value of the CO2 flowrate at the steady state), the caprock characteristics (thickness and permeability) and CO2 overpressure