Statoil has injected CO2 into a saline aquifer for disposal. Monitoring the behaviour of the CO2 in the sand formation and the sealing capacity of the overlying shale cap rock are key elements in understanding the dynamics of the injection process. A repeated 3D seismic dataset was therefore acquired in 1999, after injection of about 2 million metric tons of CO2. The time-lapse data show a large increase in reflectivity and a large push-down of reflections caused by the injected CO2. Gas at different levels within the sand are probably trapped by thin shale layers. Only a small part has reached the top of Utsira Fm., and no signs of CO2 are observed above the top seal.
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