The CO2 storage atlas of the Barents Sea has been prepared by the Norwegian Petroleum Directorate at the request of the Ministry of Petroleum and Energy (Halland et al. 2013). The main objectives have been to identify the safe and effective areas for long-term storage of CO2 and to avoid possible negative interference with ongoing and future petroleum activity. We have built on the knowledge we have from the petroleum industry and from the two CO2 storage projects, Sleipner and Snøhvit, on the Norwegian Continental Shelf. Detailed work has been carried out on all relevant geological formations and hydrocarbon fields. The work is based on several studies as well as data from more than 40 years of petroleum activity on the Norwegian Continental Shelf. Evaluated storage possibilities are saline aquifers, defined structures, abandoned oil and gas fields, and use of CO2 in producing fields to enhance recovery. The storage mechanisms considered are both structural and stratigraphic trapping. A number of geological formations have been individually evaluated, and grouped into saline aquifers. The aquifers were evaluated with regard to reservoir quality and presence of relevant sealing formations. Those aquifers that may have a relevant storage potential in terms of depth, capacity and injectivity have been considered. Structural maps and thickness maps of the geological formations are presented in the atlas, and were used to calculate pore volumes. A simulation model of the Bjarmeland structure within Stø Formation equivalent (Middle Jurassic) is situated on the southern end of the Bjarmeland Platform towards the Nyslepp Fault Complex (Fig.1). The model was built for the purpose of assessing its CO2 storage potential. The Stø Formation is thickest in southwestern wells, thinning generally eastwards (Fig.2). The sands in the Stø Fm were deposited in prograding coastal regimes, and a variety of linear clastic coastal lithofacies are represented. Marked shale/siltstone intervals represent regional transgressive pulses in the late Toarcian and late Aalenian.


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