TY - JOUR
T1 - Mineralogical alterations during laboratory-scale carbon sequestration experiments for the Illinois Basin
AU - Yoksoulian, Lois E.
AU - Freiburg, Jared T.
AU - Butler, Shane K.
AU - Berger, Peter M.
AU - Roy, William R.
N1 - We thank Hannes Leetaru, Rob Finley, Riley Hoss, Ashley Howell and Brittany Schnepel of the Illinois State Geological Survey. This research is funded by the United States EPA-Science to Achieve Results (STAR) Program Grant # 488220 and by the U.S. Department of Energy through the National Energy Technology Laboratory (NETL) and by a cost share agreement with the Illinois Department of Commerce and Economic Opportunity, Office of Coal Development through the Illinois Clean Coal Institute.
PY - 2013
Y1 - 2013
N2 - During geological sequestration of carbon dioxide, the injected CO2 will react with formation fluids and rocks in the injection zone and overlying cap rocks. The resulting acidification of the fluids may result in the dissolution of solid phases and the formation of new solid phases which can cause changes in rock composition and overall fabric. We are conducting laboratory-scale geochemical and mineralogical studies on reservoir and cap rock samples in the Illinois Basin that complement the on-going Illinois Basin - Decatur Project (IBDP), a large-scale one million tonne demonstration of geologic sequestration in the Mt Simon Sandstone, Illinois USA. Mt. Simon Sandstone, Eau Clare Shale, and KNOx Supergroup samples from the IBDP injection and deep monitoring wells and locations with rocks analogous to those at the IBDP site have been selected for simulated reactions using synthetic brine and CO2 in modified Parr pressure reactors at pressure and temperature conditions that correspond to ambient reservoir conditions (9.87 to 20.7 MPa and 38 to 50 °C) and for varying amounts of time (1 to 9 months). Using petrographic techniques and XRD analysis, samples have been analyzed before and after reactor experiments to define the mineralogical and textural baseline and report observed changes. Brine composition has also been analyzed for geochemical changes. The React® and Differential Evolution geochemical modeling programs are being used to simulate changes in mineral mass and brine chemistry. Post-reaction analyses of rock and brine samples from the Mt. Simon Sandstone show evidence of dissolution of diagenetic clays, increased porosity, and possible illitization of clay minerals. Three, six, and nine month post-reaction Eau Claire Shale rock and brine sample analyses indicate some degree of brine-rock-CO2 reaction by showing weathered illite, mixed clay, feldspar, biotite, and pyrite crystals. Post-reaction Potosi Dolomite rock and brine samples show evidence of dissolution of dolomite. Overall, petrographic and geochemical observations from these experiments suggest that the Mt. Simon Sandstone reservoir and Eau Claire cap rock system serve as good CO2 sequestration site. The competency of the KNOx Supergroup as a CO2 sequestration target is still under investigation.
AB - During geological sequestration of carbon dioxide, the injected CO2 will react with formation fluids and rocks in the injection zone and overlying cap rocks. The resulting acidification of the fluids may result in the dissolution of solid phases and the formation of new solid phases which can cause changes in rock composition and overall fabric. We are conducting laboratory-scale geochemical and mineralogical studies on reservoir and cap rock samples in the Illinois Basin that complement the on-going Illinois Basin - Decatur Project (IBDP), a large-scale one million tonne demonstration of geologic sequestration in the Mt Simon Sandstone, Illinois USA. Mt. Simon Sandstone, Eau Clare Shale, and KNOx Supergroup samples from the IBDP injection and deep monitoring wells and locations with rocks analogous to those at the IBDP site have been selected for simulated reactions using synthetic brine and CO2 in modified Parr pressure reactors at pressure and temperature conditions that correspond to ambient reservoir conditions (9.87 to 20.7 MPa and 38 to 50 °C) and for varying amounts of time (1 to 9 months). Using petrographic techniques and XRD analysis, samples have been analyzed before and after reactor experiments to define the mineralogical and textural baseline and report observed changes. Brine composition has also been analyzed for geochemical changes. The React® and Differential Evolution geochemical modeling programs are being used to simulate changes in mineral mass and brine chemistry. Post-reaction analyses of rock and brine samples from the Mt. Simon Sandstone show evidence of dissolution of diagenetic clays, increased porosity, and possible illitization of clay minerals. Three, six, and nine month post-reaction Eau Claire Shale rock and brine sample analyses indicate some degree of brine-rock-CO2 reaction by showing weathered illite, mixed clay, feldspar, biotite, and pyrite crystals. Post-reaction Potosi Dolomite rock and brine samples show evidence of dissolution of dolomite. Overall, petrographic and geochemical observations from these experiments suggest that the Mt. Simon Sandstone reservoir and Eau Claire cap rock system serve as good CO2 sequestration site. The competency of the KNOx Supergroup as a CO2 sequestration target is still under investigation.
KW - Experimental
KW - Geochemical modeling
KW - Geochemistry
KW - Geologic sequestration
KW - Illinois Basin
KW - Mineralogy
KW - Petrology
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U2 - 10.1016/j.egypro.2013.06.482
DO - 10.1016/j.egypro.2013.06.482
M3 - Conference article
AN - SCOPUS:84898745772
SN - 1876-6102
VL - 37
SP - 5601
EP - 5611
JO - Energy Procedia
JF - Energy Procedia
T2 - 11th International Conference on Greenhouse Gas Control Technologies, GHGT 2012
Y2 - 18 November 2012 through 22 November 2012
ER -