CO2–brine–rock interaction — First results of long-term exposure experiments at in situ P–T conditions of the Ketzin CO2 reservoir

Sandstone samples of the Stuttgart Formation at Ketzin have been experimentally treated with CO2 and synthetic reservoir brine in high-quality steel autoclaves at simulated in situ P–T conditions (5.5 MPa, 40 °C). In order to observe mineralogical changes induced by CO2, untreated samples are compared to CO2-treated ones. Most samples show an analogous petrography of mainly quartz and plagioclase. Heterogeneities are related to minor mineral...