Laboratory-Scale Interaction between CO2-Rich Brine and Reservoir Rocks (Limestone and Sandstone)

In the laboratory, synthetically fractured cores of limestone and sandstone were reacted with CO2-rich brines at flow rates ranging from 0.2 to 60 mL h−1 and 80 bar pCO2 and 60 °C (supercritical CO2 conditions). Interaction between the sulfate-CO2-rich brines and the primary minerals of the rock caused significant permeability variations. Calcite dissolution was clearly identified and in some case associated with gypsum (or anhydrite) precipitation.