Abstract
Abstract This study is focused on the investigation of four lithostratigraphic units (two potential reservoir rocks and two potential seal rocks) for geological storage of CO 2 in the Mesozoic Asturian basin (NW Spain). Two systems reservoir-seal are studied both in the Jurassic (Liassic limestones and dolostones of the Gijon formation as reservoir rock and Sinemurian-Bajocian marly limestones of Rodiles formation as seal rock) and Cretaceous (Aptian greywackes and sandstones of the Pola de Siero formation as reservoir rock and Albian grainstone-type limestones with argillaceous horizons as seal rock) sequences. Detailed information of the mineralogical distribution and texture, geochemical composition, porosity and pore size distribution is provided for each rock. Compared to the Cretaceous system, the Jurassic reservoir shows a better net thickness and pore size distribution and the Jurassic seal has an already demonstrated low permeability. The Cretaceous reservoir presents better porosity values (7.96% against a 0.5% of the Gijon formation), but the seal permeability is yet to be proven as low.
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