Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams

CO2 sequestration in deep coal seams is a potential option for reducing greenhouse gas emissions. Once CO2 is injected into coal seams, sealing capability of the cap rock is critical. To investigate and quantify reactions over time between CO2, cap rocks and brine, associated with selected cap rocks of the No. 3 coalbed of the Qinshui Basin in China, batch experiments were conducted for reacting powdered rock samples (180–220 μm) with CO2 and...