2-D Numerical Modeling of CO2 Storage in the Devonian H2S Containing Nisku Aquifer in the Wabamun Lake Area (Alberta, Canada)

AbstractThe Devonian Nisku aquifer has been identified as a suitable CO2 storage site in the Alberta Basin, but this aquifer contains significant amounts of H2S. Numerical simulations were performed to investigate the impact of dissolved H2S in the brine on the behavior of the injected CO2. No major differences in geochemical reactions were observed between model runs with and without H2S. Extensive dolomite dissolution was observed in both model runs, which caused a minor increase in porosity and permeability of the aquifer. The majority of the injected CO2 was trapped in the Middle Nisku as a free supercritical phase and the rest was dissolved in the brine