Injecting supercritical CO (scCO) into basalt formations for long-term storage is a promising strategy for mitigating CO emissions. Mineral carbonation can result in permanent entrapment of CO; however, carbonation kinetics in thin HO films in humidified scCO is not well understood. We investigated forsterite (MgSiO) carbonation to magnesite (MgCO) via amorphous magnesium carbonate (AMC; MgCO·HO, 0.
View Article and Find Full Text PDFEnviron Sci Technol
November 2020
In 2013, the Pacific Northwest National Laboratory led a geologic carbon sequestration field demonstration where ∼1000 tonnes of CO was injected into several deep Columbia River Basalt zones near Wallula, Washington. Rock core samples extracted from the injection zone two years after CO injection revealed nascent carbonate mineralization that was qualitatively consistent with expectations from laboratory experiments and reactive transport modeling. Here, we report on a new detailed analysis of the 2012 pre-injection and 2015 post-injection hydrologic tests that capitalizes on the difference in fluid properties between scCO and water to assess changes in near-field, wellbore, and reservoir conditions that are apparent approximately two years following the end of injection.
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