Physicochemical effects of discrete CO2-SO2 mixtures on injection and storage in a sandstone aquifer
article
Geological storage of captured CO2, which typically will contain certain amounts of impurities, in salineaquifers is of potential to reduce greenhouse gas emissions into the atmosphere. The co-injection of theimpurity SO2has an effect on the chemical reactivity of the fluid and solid phases as well as on the physicalbehaviour of the CO2plume. To address these influences we assessed the impact of SO2on the physic-ochemical behaviour of the CO2phase by pressure-volume-temperature calculations and geochemicalmodelling of fluid-rock interactions. As case study, the Ketzin pilot site in Germany was chosen. Theresults reveal that the presence of SO2causes a greater porosity decrease compared to pure CO2duringthe injection period. Certainly, any textural changes that occur in the vicinity of the injection well are ofimportance for selecting the right injection strategy and to reduce operational costs. We further assessedthe impact of SO2on the overall CO2storage capacity at different depth. Particularly, there is a maxi-mum reduction of the storage capacity at low depth, but the general impact of SO2concentrations <1%is comparatively low. Furthermore, short-term porosity changes that are induced by chemical reactionsbeyond the dry-out zone will reduce the pore spaces available for storage
TNO Identifier
573663
Source
International Journal of Greenhouse Gas Control, 54, pp. 640-651.
Pages
640-651
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