Regional scale

The pressure created by injecting CO2 into the reservoir causes the native brine fluids to migrate elsewhere. CO2 storage sites are carefully selected so as to avoid any pollution of overlying groundwater supplies either by direct mixing in the same formation or by indirect leakage path (wells or faults). The results of the detailed studies are then merged and transposed to a 3D model at basin scale:

1) reservoir: upscaling of the processes from reservoir (10s of m) to basin scale (10 km) to evaluate possible hydrological impacts (brine displacement, fluid mixing, pressurization of existing fault);

2) caprock: numerical modeling of long-term leakage of fractured caprock and fault systems;

3) wellbore: impact of CO2 leakage through wells from saline aquifers to overlying groundwater supplies.

Dernière mise à jour le 12.05.2014