Multiphase Sequestration Geochemistry: Model for Mineral Carbonation

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · Energy Procedia, 4:5009-5016

DOI:https://doi.org/10.1016/j.egypro.2011.02.472· OSTI ID:1022427

White, Mark D; McGrail, B Peter; Schaef, Herbert T; Hu, Jian Z; Hoyt, David W; Felmy, Andrew R; Rosso, Kevin M; Wurstner, Signe K

Carbonation of formation minerals converts low viscosity supercritical CO2 injected into deep saline reservoirs for geologic sequestration into an immobile form. Until recently the scientific focus of mineralization reactions with reservoir rocks has been those that follow an aqueous-mediated dissolution/precipitation mechanism, driven by the sharp reduction in pH that occurs with CO2 partitioning into the aqueous phase. For sedimentary basin formations the kinetics of aqueous-mediated dissolution/precipitation reactions are sufficiently slow to make the role of mineralization trapping insignificant over a century period. For basaltic saline formations aqueous-phase mineralization progresses at a substantially higher rate, making the role of mineralization trapping significant, if not dominant, over a century period. The overlooked mineralization reactions for both sedimentary and basaltic saline formations, however, are those that occur in liquid or supercritical CO2 phase; where, dissolved water appears to play a catalyst role in the formation of carbonate minerals. A model is proposed in this paper that describes mineral carbonation over sequestration reservoir conditions ranging from dissolved CO2 in aqueous brine to dissolved water in supercritical CO2. The model theory is based on a review of recent experiments directed at understanding the role of water in mineral carbonation reactions of interest in geologic sequestration systems occurring under low water contents.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1022427
• Report Number(s): PNNL-SA-74658; 39937; 32911; 39924
• Journal Information: Energy Procedia, 4:5009-5016, Journal Name: Energy Procedia, 4:5009-5016 Vol. 4
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
BRINES
CARBONATE MINERALS
CATALYSTS
Environmental Molecular Sciences Laboratory
GEOCHEMISTRY
KINETICS
MINERALIZATION
RESERVOIR ROCK
SEDIMENTARY BASINS
TRAPPING
VISCOSITY
WATER
deep saline formation
geologic sequestration
kinetic reaction
mineral carbonation
mineralization
multiphase geochemistry