Exploring safe disposal of CO2 and wastewater in saline aquifers

The modified-Hall analysis turned out to be the critical diagnostic tool for identifying the abnormal injection behavior and real-time disposal process for both fluids. We estimated the safe pore-volume injection for disposal of wastewater and CO2 to be 1.6% and 1.5%, respectively, in saline aquifers at 80% probability. Of the CO2 trapping mechanisms studied here, critical gas saturation turned out to be the most dominant in residual trapping mechanism, whereas porosity and brine salinity appeared dominant in solubility trapping mechanism.