Exploring geological storage sites for CO2 from Norwegian gas power plants: Johansen formation

Abstract The Johansen formation at depths between 2400 and 2100 m has been identified as a possible candidate for storage of CO 2 from future point sources at Mongstad and Karso. The studied injection point in the Johansen Formation is located 80 km west of Mongstad and 600 m below the Sognefjord formation which also contains the Troll oil and gas field. Based on simulations on a reservoir model built from existing seismic and well data, the formation exhibits a robust target for permanent storage of CO 2 assuming an injection rate of 3 million tonne CO 2 per year over a 110 year period. In the worst case scenario the CO 2 will not reach the Troll gas and oil field until 150 years after injection start. At that time it is assumed that hydrocarbon production at Troll has ceased.