Laboratory and numerical modeling of geochemical reactions in a reservoir used for CO2 storage

Abstract

This paper presents the initial set of results obtained during laboratory experiments and numerical modeling of geochemical reactions performed by the Plains CO2 Reduction (PCOR) Partnership. Selected samples are from several different formations of the Williston Basin, including Bakken, Broom Creek, Madison, and Winnipeg. The XRD mineralogical analysis of selected samples reported anhydrite, calcite, dolomite, forsterite, and quartz as dominant phases. The powdered samples were exposed to supercritical carbon dioxide at 4000 psi and 80 ∘C in dry, freshwater, and brine conditions. The numerical modeling was performed utilizing the geochemical code PHREEQC, where the thermodynamic database was adjusted with SUPRCRT92 code.