CO2 sorption of Pomeranian gas bearing shales - the effect of clay minerals

The idea behind this study was to assess the sorption capacity of shale rocks as potential CO2 storage sites. Thinly laminated mudrocks (gas bearing shales from Baltic Basin) with matrix composed mostly of illite, K-mica and chlorites and varying amount of organic matter were selected for the study. Results of sorption measurements up to the pressure of 15 MPa and at temperature of 50°C and 80°C were compared with XRD compositional analysis of samples and TOC values. Our experiments demonstrate that when organic matter is nearly absent in mudstones CO2 sorption may also occur in clay minerals.