279199 Geo-Chemo-Mechanical Studies for Permanent CO2 Storage in Geologic Reservoirs

Wednesday, October 31, 2012: 2:10 PM
336 (Convention Center )
Greeshma Gadikota1, Juerg Matter2, Peter Kelemen2 and Ah-Hyung Alissa Park3, (1)Chemical Engineering, Columbia University, New York, NY, (2)Earth and Environmental Sciences, Columbia University, Palisades, NY, (3)Earth and Environmental Engineering & Chemical Engineering, Columbia University, New York, NY

Increasing concentration of CO2 in the atmosphere is attributed to rising consumption of fossil fuels around the world. The development of solutions to reduce CO2 emissions to the atmosphere is one of the most urgent needs of today’s society. CO2 injection into geological formations is one of the CO2 storage options with a large capacity. If non-carbonate minerals such as basalt and olivine exist in the CO2 injection site, the injected CO2 can react with those minerals to form thermodynamically stable solid carbonates. In nature, mineral carbonation takes place via dissolution of the mineral to release Ca/Mg ions followed by precipitation of Ca/Mg in the presence of CO2. The rate limiting step of this carbon mineralization process is considered to be the dissolution of the mineral.A question has been raised regarding the effect of in-situ carbon mineralization on the stability of the geologic storage of CO2. Both the kinetics and extents of mineral dissolution and carbonation reactions within the geological reservoir are important factors to evaluate for the long term stability of the geologically injected CO2.Therefore, this work focuses on understanding CO2-mineral-water interactions at a wide range of reaction conditions (Tmax = 200­oC and PCO2, max = 200 bar). Both deionized water and synthetic brine were used as the aqueous reaction media. Minerals such as olivine (Mg2SiO4), labradorite ((Ca,Na)(Al,Si)4O8) and basalt (mixture of silicate minerals), were selected based on their abundance in nature and both dissolution and single-step carbonation experiments were performed to investigate fast and long-term kinetics of mineral weathering. Two different regimes (i.e., surface reaction vs. mass transfer limited regimes) of mineral weathering were identified based on the analyses of the activation energy and reaction kinetics.

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See more of this Session: CO2 Capture, Control and Sequestration II
See more of this Group/Topical: Sustainable Engineering Forum