HR: 1330h
AN: GC32A-0203    [PDF]
TI: Geologic Sequestration of CO2 and Associated H2S and SO2 in Bedded Sandstone-Shale Sequences
AU: Xu, T
EM: Tianfu_Xu@lbl.gov
AF: Lawrence Berkeley National Laboratory, Mail Stop 90-1116 One Cyclotron Road, Berkeley, CA 94720 United States
AU: Apps, J A
AF: Lawrence Berkeley National Laboratory, Mail Stop 90-1116 One Cyclotron Road, Berkeley, CA 94720 United States
AU: * Pruess, K
EM: K_Pruess@lbl.gov
AF: Lawrence Berkeley National Laboratory, Mail Stop 90-1116 One Cyclotron Road, Berkeley, CA 94720 United States
AB: The injection of CO2 and associated acid gases such as H2S and SO2 into deep sedimentary aquifers is a means by which net anthropogenic atmospheric emissions of greenhouse gases might be reduced. Aquifer host rock aluminosilicate minerals alter very slowly under ambient conditions and their study is not amenable to laboratory experiment. We therefore developed a numerical model to investigate the fate of CO2 and other acid gases in bedded sandstone-shale sequences using hydrogeologic properties and mineral compositions characteristic of Texas Gulf Coast sediments. The simulations were performed using the reactive fluid flow and geochemical transport code, TOUGHREACT, to analyze mass transfer between sandstone and shale layers, the consequent immobilization of gases through mineral precipitation, and the impact of co-contaminated H2S and SO2 gases on CO2 sequestration. The gas sequestration capacity by both aqueous and mineral phases was evaluated. Porosity changes due to mineral dissolution and precipitation were also monitored. The simulations provide useful insights into potential sequestration processes, and their controlling conditions and parameters during long-term containment of acid gases in deep sedimentary formations.
DE: 1000 GEOCHEMISTRY (New field, replaces Rock Chemistry)
DE: 1645 Solid Earth
DE: 1832 Groundwater transport
DE: 2753 Numerical modeling
DE: 3665 Mineral occurrences and deposits
SC: Global Climate Change [GC]
MN: 2003 Fall Meeting