Carbon Sequestration in High Temperature Liquid-Dominated Geothermal Reservoirs

Abstract

Possibility of carbon sequestration in high temperature liquid dominated geothermal reservoirs is analyzed by means of reservoir simulations. Several different simulations with differing carbon dioxide injection rates and injection pressures were conducted on a fractured simulation model by using a commercial reservoir simulator. It was observed that it is possible to sequester CO2 with small temperature drop (approximately 5 C) if CO2 is injected near the meteoric water feed zone for short periods of time. Premature breakthrough of CO2 was observed in other cases where side and center injections with differing injection pressures and rates were considered. As fracture density decreased from 10/m to 20 /m in vertical direction CO2 breakthrough time decreased considerably.