PVTX Properties of H2O-CO2-"salt" at PTX Conditions Applicable to Carbon Sequestration in Saline Formations

Fluids in the Continental Crust

“…However, conversion of feldspar to clays, clay leaching or carbonate dissolution all serve to raise pH (Rosenqvist et al, 2012). One of us (Bodnar et al, 2013b;Steele-MacInnis et al, 2013) has recently examined the solubility of CO 2 in saline formations and the potential implications for implementing an effective storage protocol to accommodate the large amounts of CO 2 being generated by coal (and other fossil fuel-burning) power plants.…”

Experimental Perspectives of Mineral Dissolution and Precipitation due to Carbon Dioxide-Water-Rock Interactions

“…Provided the pH remains below the apparent first dissociation constant of carbonic acid (pKa = c. 6 according to temperature and salinity of the fluid (e.g. Bodnar et al 2013)), the dominant aqueous carbonate species remain as CO 2 (aq) and H 2 CO 3 o , and mineral dissolution has little effect on total dissolved inorganic carbon. If mineral reactions result in a rise in pH above pK a , however, significant additional CO 2 may enter solution as bicarbonate, enabling additional carbon to be stored through solubility trapping.…”

Conductivity Measurements on H2O-Bearing CO2-Rich Fluids

“…At the PT conditions relevant to this study (298-473 K and 7.39-20 MPa), H 2 O and CO 2 have limited mutual solubility [14][15][16][17][18][19]. In this study we use the model of Spycher and Pruess [14] for the CO 2 -rich end of the system and the Duan and Sun [15] model, following the methodology presented in Steele-MacInnis et al [18] and Bodnar et al [19], to estimate phase equilibria in the H 2 O-CO 2 system.…”

“…In this study we use the model of Spycher and Pruess [14] for the CO 2 -rich end of the system and the Duan and Sun [15] model, following the methodology presented in Steele-MacInnis et al [18] and Bodnar et al [19], to estimate phase equilibria in the H 2 O-CO 2 system. Figure 1 presents a phase diagram for the system H 2 O-CO 2 at PT conditions relevant to this study.…”