Volumetrics of CO2 Storage in Deep Saline Formations

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• 作者：Matthew Steele-MacInnis ; Ryan M. Capobianco ; Robert Dilmore ; Angela Goodman ; George Guthrie ; J. Donald Rimstidt ; Robert J. Bodnar
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：47
• 期：1
• 页码：79-86
• 全文大小：623K
• 年卷期：v.47,no.1(January 2, 2013)
• ISSN：1520-5851

文摘

Concern about the role of greenhouse gases in global climate change has generated interest in sequestering CO₂ from fossil-fuel combustion in deep saline formations. Pore space in these formations is initially filled with brine, and space to accommodate injected CO₂ must be generated by displacing brine, and to a lesser extent by compression of brine and rock. The formation volume required to store a given mass of CO₂ depends on the storage mechanism. We compare the equilibrium volumetric requirements of three end-member processes: CO₂ stored as a supercritical fluid (structural or stratigraphic trapping); CO₂ dissolved in pre-existing brine (solubility trapping); and CO₂ solubility enhanced by dissolution of calcite. For typical storage conditions, storing CO₂ by solubility trapping reduces the volume required to store the same amount of CO₂ by structural or stratigraphic trapping by about 50%. Accessibility of CO₂ to brine determines which storage mechanism (structural/stratigraphic versus solubility) dominates at a given time, which is a critical factor in evaluating CO₂ volumetric requirements and long-term storage security.