This study examines the impact of flue gas contaminants on saline formation under CO2 sequestration conditions.    Both simulation and experimental works were conducted.  The simulation work was conducted via use of Geochemist workbench.   We simulated the chemical reactions in the Mt. Simon sandstone environment with exposure to CO2 mixed with other gas species under conditions that mimic sequestration. (Experimental conditions were as follows: solid material - Mt. Simon sandstone; liquid  - Illinois Basin brine; T and P - 50 C, 1500 psi; gas composition - 1% SO2, 4% O2, 95% CO2).  The simulated experimental conditions include various Mt. Simon/Ill brine ratios from 3, 5 and 15 in a one liter vessel both with and without SO2 and O2.    Preliminary results showed that, as expected, the addition of SO2 and O2 affected pH, the concentrations of cations in the aqueous phase, and the oxidation state of iron.  Fluid pH was acidic in all simulations, although though it was markedly lower in the simulations with SO2 and O2. Increasing the proportion of solid material in the system buffered the system and increased pH.  Ca and Mg ions responded differently to the addition of SO2 and O2 and showed a strong dependence on pH in the mixed gas system.  Aqueous ferrous iron and siderite were predicted by the CO2-alone simulations.

Potential impact of combustion contaminants in saline formation

248th National Meeting (2014)

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