Greenpeace has released a report, “Leakages in the Utsira formation and their consequences for CCS policy,” that examines CO2 storage in the North Sea. They first examine a leakage issue at the Utsira formation, which was being operated by StatoilHydro. In May 2008, workers noticed oily water at the sea surface near their platform and, following an investigation, it was determined that “injection activities had caused cracking in the seabed above the reservoir, thereby allowing a stream of processed water to escape back into the sea.”
The review also evaluates CO2 storage at the Sleipner CO2 Injection Project, at which no leakages have been reported. Peter Hugan from the Institute of Geophysics at the University of Bergen told Greenpeace, though, “it's not possible to prove that all injected CO2 is still there. There's no way of measuring the amount of CO2 in the formation with sufficient accuracy using seismic mapping.”
The tenor of the report isn't a surprise because Greenpeace has publicly stated on previous occasions that it generally does not support carbon capture and storage.