[논문]Shale-brine-CO2 interactions and the long-term stability of carbonate-rich shale caprock

Ilgen, A.G.; Aman, M.; Espinoza, D.N.; Rodriguez, M.A.; Griego, J.M.; Dewers, T.A.; Feldman, J.D.; Stewart, T.A.; Choens, R.C.; Wilson, J.

doi:10.1016/j.ijggc.2018.07.002

Shale-brine-CO2 interactions and the long-term stability of carbonate-rich shale caprock 원문보기

International journal of greenhouse gas control, v.78, 2018년, pp.244 - 253

Ilgen, A.G. (Sandia National Laboratories, Geochemistry Department) , Aman, M. (Department of Petroleum and Geosystems Engineering, The University of Texas at Austin) , Espinoza, D.N. (Department of Petroleum and Geosystems Engineering, The University of Texas at Austin) , Rodriguez, M.A. (Sandia National Laboratories, Materials Characterization and Performance Department) , Griego, J.M. (Sandia National Laboratories, Materials Characterization and Performance Department) , Dewers, T.A. (Sandia National Laboratories, Geomechanics Department) , Feldman, J.D. (Sandia National Laboratories, Geomechanics Department) , Stewart, T.A. (Sandia National Laboratories, Geochemistry Department) , Choens, R.C. (Sandia National Laboratories, Geomechanics Department) , Wilson, J. (Akima Infrastructure Services, LLC)

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Abstract The success of geological carbon storage (GCS) depends on the sealing properties of caprocks, typically mudrocks, and their laminated variety – shales. In this study, we examined mineralogical changes in carbonate-rich Mancos Shale and corresponding changes in micro-mechanical properties following the reaction with carbon dioxide (CO2). Mineralogical changes of Mancos Shale depended on the pressure of CO2 during its exposure to the CO2-brine mixtures for up to 8 weeks. Dedolomitization was observed in the reactors pressurized with 100 psi of CO2, combined with the precipitation of gypsum. In the reactor pressurized with 2500 psi of CO2, the complete dissolution of calcite, partial dissolution of dolomite, and precipitation of magnesite and anhydrite were observed. Localized mechanical weakening was observed only for dolomite-muscovite-illite-rich laminae following whole shale puck alteration at 2500 psi of CO2, and a decrease of up to 50 ± 20% in scratch toughness was observed. The quartz-calcite-rich laminae did not exhibit a measurable difference in scratch toughness before and after reaction in CO2-rich brine. The predicted changes in mineralogy, porosity, density, and hardness of Mancos Shale are limited, according to the geochemical models describing alteration of shale by CO2-rich brine lasting for 5000 years. This study illustrates a coupled and localized chemical-mechanical response of caprock to the injection of CO2. Highlights Carbonate-rich Mancos shale was altered by CO2-brine. Mineralogical changes depended on the pressure of CO2. Mechanical weakening was observed only for dolomite-muscovite-illite laminae. Quartz-calcite-rich laminae were not susceptible to mechanical degradation. Calibrated geochemical models predict limited shale alteration over 5000 years.

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Shale-brine-CO2 interactions and the long-term stability of carbonate-rich shale caprock 원문보기

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