OSLO, Norway --Carbon dioxide could be stored in two subsurface formations in the Norwegian shelf, according to a new report.
The study, prepared by Gasnova, Gasco, and the Norwegian Petroleum Directorate on behalf of the Ministry of Petroleum and Energy, evaluated sites with large volumes of sand and sandstone that are well sealed so that gas and liquid cannot leak outward or upward.
The best candidates for CO2 disposal appear to be the Utsira formation and the underlying Skade formation close to the Sleipner field and the Johansen formation beneath the Troll field.
Utsira is used already for storing CO2 produced from Sleipner and as a water source for injection on Oseberg.
The advantage of the Johansen formation is that it forms a deep, close structure from which injected CO2 should not leak to the surface. Geologists would need to clarify whether there could be a leak to Troll itself.