The Latest Sleipner CO2 Injection Monitoring Using Dual Sensor Streamer Technology

CO2 has been injected into the saline aquifer Utsira Fm at the Sleipner field since 1996. In order to monitor the movement of the CO2 in the sub-surface, a total number of seven seismic monitor surveys have been acquired, in addition to a base survey. In addition gravity monitoring has been carried out, giving complementary information. The most recent seismic survey was acquired in 2010, using dual sensors, and we here report on the time-lapse observations with a special focus on the improved resolution compared to conventional streamer at conventional towing depths. The main findings from this study are that the CO2 is still contained in the subsurface, and that the higher resolution of the 2010 survey has enabled us to refine the interpretation of the CO2 saturated layers within the Utsira formation.