Sequestration of Dissolved CO2 in the Oriskany Formation

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• 作者：Robert M. Dilmore ; Douglas E. Allen ; J. Richard McCarthy Jones ; Sheila W. Hedges ; Yee Soong
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：April 15, 2008
• 年：2008
• 卷：42
• 期：8
• 页码：2760 - 2766
• 全文大小：5637K
• 年卷期：v.42,no.8(April 15, 2008)
• ISSN：1520-5851

文摘

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.