CO2 storage potential in on- and offshore Denmark - Implications to Kazakhstan Reservoirs

Many potential CO 2 storage sites exist in the Danish subsurface, as several regionally extensive reservoir sandstones provide thick, porous, and permeable reservoirs atop structures with four-way dip closure induced by salt tectonics. The mineralogical stability of the reservoir sand towards CO 2was tested in flow and batch laboratory experiments at reservoir conditions. Dissolution of carbonate grains and cement was commonly observed, implying that in the subsurface, cement dissolution should be expected near CO2 injection wells. In contrast, precipitation of new minerals may be anticipated further from the CO2 plume. Similar favourable geology for CO2 storage may be found in Kazakhstan, where the experience from Denmark can be used to leverage the maturation of storage sites.