It is found that simulated pressures are much more sensitive to space discretization effects than are phase saturations. Numerical simulations are presented for injection of CO2 into a brine aquifer, and for loss of CO2 from storage through discharge along a fault zone. Chemical reactions and mechanical stress effects are neglected. A realistic treatment of PVT (fluid) properties is given which includes salinity and fugacity effects for partitioning of CO2 between gaseous and aqueous phases. Phase change processes are treated through switching of primary thermodynamic variables. The equations are discretized using an integral finite difference method, and are solved using methods developed in geothermal and petroleum reservoir engineering. Injection of CO2 into saline aquifers is described by mass conservation equations for the three components water, salt (NaCl), and CO2.
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