Injection of supercritical CO 2 for geothermal exploitation from sandstone and carbonate reservoirs: CO 2 –water–rock interactions and their effects

CO2 can be injected into geothermal reservoirs to exploit geothermal energy. It is of concern that complex geochemical reactions induced by CO2 can result in change of the reservoir porosity and affect the fluid flow and heat mining rate. In this study, laboratory experiments on CO2–water–rock interactions were conducted to investigate the geochemical reactions using rock samples from typical sandstone and carbonate reservoirs. Based on the...