The Latest Sleipner CO2 Injection Monitoring Using Dual Sensor Streamer Technology

CO2 is at Sleipner injected into the Utsira Fm, a shallow aquifer at 800-1100 m depth. Since 1996 more than 13 Mt has been injected (by 2012). In order to monitor the distribution of the CO2 in the sub-surface, a total of seven seismic monitor surveys have been acquired. These form, together with a base survey from 1994 (prior to injection start) a unique dataset (Chadwick et al 2004, Arts et al 2008). In addition, three gravity monitoring surveys give complementary information (Alnes et al 2011). In this paper we focus on the most recent seismic dataset, acquired using PGS’ Geostreamer dual sensor technology. These data can be redatumed from a deep tow depth to a shallower tow depth for comparison with previous monitor surveys, and are in addition expected to have broader frequency content than previous data ( which have non-optimal tow depths), enabling interpretation of finer details.