Since 1996 Statoil has injected CO2 separated from gas of the Sleipner Vest field into saline<br>reservoir sands of the Utsira Forrnation in the central North Sea at a depth of approximately 900 m.<br>This is the first case of industrial scale CO2 storage in the world (1 million tons per year). The<br>Saline Aquifer CO2 Storage (SACS) project is conducted by a consortium of oil companies and<br>research institutions. This paper presents regional geological interpretation in the southem Viking<br>Graben area. Sands of the Mio-Pliocene Utsira Formation and the Nordland Shale have been<br>identified and their stratigraphical architecture outlined from seismic sections and well-logs.<br>Detailed geophysical and geological aspects at the injection site are treated in Arts et al. (this<br>volume) and Brevik et al. (this volume).


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