8.1.4 CO2 storage quality and capacity
During the SACS-project, it has been shown that the Utsira Formation has good storage quality with respect to porosity, permeability, mineralogy, bedding, depth, pressure and temperature (e.g. Zweigel and Lindeberg 2000). It is a very large aquifer with a thick and extensive claystone top seal. The aquifer is, however, unconfined along its margins, and the time before migrating CO2 might reach the margins of the aquifer is unknown. The Utsira Formation is regarded as one of the most promising aquifers for CO2 storage in Europe. It has both such a considerable thickness and extent that it alone could store the CO2 emissions from all of the north European power stations and other large industrial plants for several hundred years (Torp & Christensen 1998). It is estimated that the Utsira Formation, below 800 m
depth, has a pore volume of 918 km3, a storage capacity in traps of 847 Mt (mega tonnes) CO2, and that the storage capacity of the entire aquifer is 42 356 Mt CO2 with an assumption that storage volume representing 3 % the pore volume (See details in Bøe et al. 2002, Table
6). The total pore volume of the aquifer is, however, estimated differently by other workers,
6.05 x 1011 m3 (Kirby et al. 2001) and 5.5 x 1011 m3 (Chadwick et al. 2000).
8.1.4 CO2 storage quality and capacity
During the SACS-project, it has been shown that the Utsira Formation has good storage quality with respect to porosity, permeability, mineralogy, bedding, depth, pressure and temperature (e.g. Zweigel and Lindeberg 2000). It is a very large aquifer with a thick and extensive claystone top seal. The aquifer is, however, unconfined along its margins, and the time before migrating CO2 might reach the margins of the aquifer is unknown. The Utsira Formation is regarded as one of the most promising aquifers for CO2 storage in Europe. It has both such a considerable thickness and extent that it alone could store the CO2 emissions from all of the north European power stations and other large industrial plants for several hundred years (Torp & Christensen 1998). It is estimated that the Utsira Formation, below 800 m
depth, has a pore volume of 918 km3, a storage capacity in traps of 847 Mt (mega tonnes) CO2, and that the storage capacity of the entire aquifer is 42 356 Mt CO2 with an assumption that storage volume representing 3 % the pore volume (See details in Bøe et al. 2002, Table
6). The total pore volume of the aquifer is, however, estimated differently by other workers,
6.05 x 1011 m3 (Kirby et al. 2001) and 5.5 x 1011 m3 (Chadwick et al. 2000).
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