TY - JOUR
T1 - CO 2-rock-brine interactions in Lower Tuscaloosa Formation at Cranfield CO 2 sequestration site, Mississippi, U.S.A.
AU - Lu, Jiemin
AU - Kharaka, Yousif K.
AU - Thordsen, James J.
AU - Horita, Juske
AU - Karamalidis, Athanasios
AU - Griffith, Craig
AU - Hakala, J. Alexandra
AU - Ambats, Gil
AU - Cole, David R.
AU - Phelps, Tommy J.
AU - Manning, Michael A.
AU - Cook, Paul J.
AU - Hovorka, Susan D.
N1 - Funding Information:
The study was funded by the Department of Energy and managed by the National Energy Technology Laboratory (Bruce Brown, DOE project manager) through the Southeast Regional Carbon Sequestration Partnership (SECARB) (managed by the Southern State Energy Board). We thank Denbury Onshore LLC for hosting the project and providing tremendous assistance during the study. We also acknowledge assistance from T. A. Meckel in making the field map. The article benefited immensely from thorough and constructive reviews by two anonymous reviewers. Publication authorized by the Director, Bureau of Economic Geology.
PY - 2012/1/6
Y1 - 2012/1/6
N2 - A highly integrated geochemical program was conducted at the Cranfield CO 2-enhanced oil recovery (EOR) and sequestration site, Mississippi, U.S.A.. The program included extensive field geochemical monitoring, a detailed petrographic study, and an autoclave experiment under in situ reservoir conditions. Results show that mineral reactions in the Lower Tuscaloosa reservoir were minor during CO 2 injection. Brine chemistry remained largely unchanged, which contrasts with significant changes observed in other field tests. Field fluid sampling and laboratory experiments show consistently slow reactions. Carbon isotopic composition and CO 2 content in the gas phase reveal simple two-end-member mixing between injected and original formation gas. We conclude that the reservoir rock, which is composed mainly of minerals with low reactivity (average quartz 79.4%, chlorite 11.8%, kaolinite 3.1%, illite 1.3%, concretionary calcite and dolomite 1.5%, and feldspar 0.2%), is relatively unreactive to CO 2. The significance of low reactivity is both positive, in that the reservoir is not impacted, and negative, in that mineral trapping is insignificant.
AB - A highly integrated geochemical program was conducted at the Cranfield CO 2-enhanced oil recovery (EOR) and sequestration site, Mississippi, U.S.A.. The program included extensive field geochemical monitoring, a detailed petrographic study, and an autoclave experiment under in situ reservoir conditions. Results show that mineral reactions in the Lower Tuscaloosa reservoir were minor during CO 2 injection. Brine chemistry remained largely unchanged, which contrasts with significant changes observed in other field tests. Field fluid sampling and laboratory experiments show consistently slow reactions. Carbon isotopic composition and CO 2 content in the gas phase reveal simple two-end-member mixing between injected and original formation gas. We conclude that the reservoir rock, which is composed mainly of minerals with low reactivity (average quartz 79.4%, chlorite 11.8%, kaolinite 3.1%, illite 1.3%, concretionary calcite and dolomite 1.5%, and feldspar 0.2%), is relatively unreactive to CO 2. The significance of low reactivity is both positive, in that the reservoir is not impacted, and negative, in that mineral trapping is insignificant.
KW - Autoclave experiment
KW - Brine chemistry
KW - CO storage
KW - Carbon isotopes
KW - Rock-water-CO reaction
KW - Tuscaloosa Formation
UR - http://www.scopus.com/inward/record.url?scp=84855442429&partnerID=8YFLogxK
U2 - 10.1016/j.chemgeo.2011.10.020
DO - 10.1016/j.chemgeo.2011.10.020
M3 - Article
AN - SCOPUS:84855442429
SN - 0009-2541
VL - 291
SP - 269
EP - 277
JO - Chemical Geology
JF - Chemical Geology
ER -