2012
Deliverable summary
Deliverable 3.1 Summary
Maxine Akhurst
D3.1 Geological report of an integrated multi-store site in the Outer Moray Firth, UK North Sea.
The concept of geological storage of CO2 in a multi-store site, by injection of CO2 into a depleted hydrocarbon field and the surrounding sandstone containing salt water, is outlined. The primary storage reservoir, primary seal, secondary reservoir and secondary seals are identified from the geological characterisation undertaken within Task 3.1 of the SiteChar project. The process for selection of a hydrocarbon field suitable for commercial-scale storage (>100 Mt CO2) within the Captain Sandstone is described. Interpretation of publicly available seismic data, well information and associated reports are used to construct a 3D geological model of stratigraphical and fault surfaces in the area of the multi-store site. The site model of the sandstone, underlying and overlying strata is inserted into and merged with the regional model of the sandstone. Geocellular models are constructed at regional and local scales. The cells are attributed with geological characteristics derived from well data and mapping of Channel and Flank deposits within the sandstone. Information on the variation of porosity, permeability and proportion of sandstone to mudstone is derived from geophysical logs and core sample analyses. The character of the sandstone is attributed across the regional and local models using numerical methods that honour the well data.