Influence of CO₂–Brine Co-injection on CO₂ Storage Capacity Enhancement in Deep Saline Aquifers: An Experimental Study on Hawkesbury Sandstone Formation

This study was conducted to identify a potential CO2-storage-capacity-enhancement technique: enhancement of CO2 storage through co-injection or the simultaneous injection of CO2 and brine into saline aquifers. A series of triaxial permeability tests on brine-saturated sandstone samples for a range of injection pressures (4–10 MPa) under different confining pressures (20–35 MPa) was performed at 35 °C constant temperature. To clearly identify the...