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Impact of SO2 Coinjection on the Reservoir - A Modelling Sensitivity Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, The Third Sustainable Earth Sciences Conference and Exhibition, Oct 2015, Volume 2015, p.1 - 5
Abstract
Reactive transport simulations were performed in order to assess the impact of impure CO2 containing SO2 on the geochemical reservoir system in carbon capture and storage (CCS) scenarios. For the numerical computation the recently released code TOUGHREACT V3.0-OMP was applied. Special emphasis is given on the aqueous chemistry of SO2, which rapidly dissolves into the formation water. Therein two different models using a kinetic as well as a thermodynamic approach were included. These allow for evaluation of transport related effects, resulting in different spatial distribution patterns of SO2 and subsequent changing chemistry involving minerals, in particular carbonates. The main focus of the presented work lies on the systematic variation of selected input parameters and the sensitivity of the numerical results on these initial conditions. In summary, the most prominent parameters determining the geochemical changes of the reservoir system are the initial concentration of SO2 as well as the type and amount of carbonate minerals available for pH buffering.