Experimental simulation of the impact of a thermal gradient during geological sequestration of CO2: The COTAGES experiment

► Impact of a thermal gradient on limestone under CO2 geological storage conditions. ► Evidences of important mass transfers from cold to hot area. ► Dissolution affects the oolithic cortex in the cold area. ► Precipitation on the hot zone occurs as microcalcite on the surface of grains. ► Changes in petrophysical properties of oolithic limestone.