Sequestration of Dissolved CO2 in the Oriskany Formation

Experiments were conducted to determine the solubility of CO2 in a natural brine solution of the Oriskany formation under elevated temperature and pressure conditions. These data were collected at temperatures of 22 and 75 °C and pressures between 100 and 450 bar. Experimentally determined data were...

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Bibliographic Details
Published in:Environmental science & technology 2008-04, Vol.42 (8), p.2760-2766
Main Authors: Dilmore, Robert M, Allen, Douglas E, Jones, J. Richard McCarthy, Hedges, Sheila W, Soong, Yee
Format: Article
Language:English
Subjects:
Carbon Dioxide - chemistry
Environmental Modeling
ENVIRONMENTAL SCIENCES
Geographic Information Systems
Geological Phenomena
Geology
GEOSCIENCES
Models, Chemical
Pressure
Reproducibility of Results
Salinity
Salts - chemistry
Solubility
Temperature
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Summary:Experiments were conducted to determine the solubility of CO2 in a natural brine solution of the Oriskany formation under elevated temperature and pressure conditions. These data were collected at temperatures of 22 and 75 °C and pressures between 100 and 450 bar. Experimentally determined data were compared with CO2 solubility predictions using a model developed by Duan and Sun (Chem. Geol. 2003, 193, 257−271). Model results compare well with Oriskany brine CO2 solubility data collected experimentally, suggesting that the Duan and Sun model is a reliable tool for estimating solution CO2 capacity in high salinity aquifers in the temperature and pressure range evaluated. The capacity for the Oriskany formation to sequester dissolved CO2 was calculated using results of the solubility models, estimation of the density of CO2 saturated brine, and available geographic information system (GIS) information on the formation depth and thickness. Results indicate that the Oriskany formation can hold approximately 0.36 gigatonnes of dissolved CO2 if the full basin is considered. When only the region where supercritical CO2 can exist (temperatures greater than 31 °C and pressures greater than 74 bar) is considered, the capacity of the Oriskany formation to sequester dissolved CO2 is 0.31 gigatonnes. The capacity estimate considering the potential to sequester free-phase supercritical CO2 if brine were displaced from formation pore space is 8.8 gigatonnes in the Oriskany formation.
ISSN:0013-936X
1520-5851
DOI:10.1021/es702229f