Fines migration during supercritical CO2 injection in sandstone

SEM-EDS analysis of the produced fines and blocked pores in the core show that blockage is caused by clay, quartz, and cement. Ionic chromatography for produced water during CO2-saturated brine and brine-saturated scCO2 injection show an increase in the ions present in the intergranular cement of Berea core. This indicates that CO2-saturated brine dissolved the cement, resulting in dislodgement of clay and quartz particles, some of which blocked the pore space near the core production end and thereby reduced permeability.