Evaluating the impacts of fine-scale capillary heterogeneity and wettability on the behavior of buoyancy-driven CO2 migration and trapping mechanisms

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• 作者：Sung Soo Park ; Tae Hong Kim ; Moon Sik Jeong ; Kun Sang Lee
• 关键词：CO2 sequestration ; Leakage ; Capillary barrier trapping ; Heterogeneity ; Wettability
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：75
• 期：7
• 全文大小：2,922 KB
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• 作者单位：Sung Soo Park (1)
  Tae Hong Kim (1)
  Moon Sik Jeong (1)
  Kun Sang Lee (1)
  
  1. Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, Republic of Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

One of the primary concerns in CO₂ sequestration is long-term immobilization of CO₂. There are several storage mechanisms to immobilize CO₂ in a porous medium: structural, dissolution, residual, and mineral trapping. Storage analysis with fine-scale heterogeneity requires the investigation of a newly suggested mechanism: capillary barrier trapping. This study covers a quantitative assessment of the CO₂ trapping capacity with residual, dissolution, and capillary barrier trapping mechanisms in heterogeneous formations. The effects of heterogeneity on CO₂ trapping capacity are studied under different wettability scenarios. The Leverett J-function is applied so that every grid block has a different drainage capillary pressure curve, which is physically consistent with its heterogeneous properties and wettability. Based on contact angle, residual saturation and relative permeability curves are modeled. Different heterogeneity and wettability causes considerable variations in leakage of CO₂, ranging from 6 to 38 %. The lateral correlation length of permeability affects the spatial distribution of CO₂. As the permeability variation increases, the total amount of trapped CO₂ increases significantly indicating a reduced potential risk of leakage. Although the residual and dissolution trappings decreases as the wetting condition changes from strongly water-wet to intermediate gas-wet, the amount of CO₂ trapped by the capillary barriers increases considerably, and the mobile phase saturation of the CO₂ is reduced. The results of this study have emphasized the importance of capillary barrier trapping, which takes a large portion of the immobilized CO₂ phase, for stable underground storage.