Schaef, H. Todd1, B. Peter McGrail1, Stephen P. Reidel1
(1) Pacific Northwest National Laboratory, Richland, WA
ABSTRACT: Geologic Sequestration of CO2 in Basalt Formations
Capture of CO2 from flue gases and subsequent geologic sequestration is being widely considered for controlling anthropogenic CO2 emissions. Massive flood basalt formations exist worldwide and have unique chemical properties that could potentially convert all the injected CO2 to solid mineral form, effectively isolating it from the atmosphere. Under certain reservoir conditions, CO2 reacts with the minerals in the basalt releasing cations (Ca, Fe, and Mg) into solution, which precipitate as a carbonate mineral. Laboratory tests have confirmed the formation of carbonate coatings when basalt samples collected from Washington State were exposed to supercritical CO2. Detailed examination of the reacted basalt shows that preferential dissolution of the glassy mesostasis and olivine in the basalt are the principal mineral phases responsible for the observed rapid carbonate mineralization.
AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.