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2014 Vol.51, Issue 5 Preview Page

Research Paper

31 October 2014. pp. 653-667
Abstract
Under circumstances where capillary entry pressure is larger than buoyancy pressure of CO2, a number of capillary barriers can exist and CO2 accumulates below them. This is a new trapping mechanism called capillary trapping. In this study, numerical simulations of CO2 sequestration were performed to estimate the amount of CO2 storage and leakage under different heterogenous systems considering capillary trapping. Leverett J-function was applied so that every grid block had a different capillary pressure curve being physically consistent with its heterogenous properties. The flow pattern of CO2 plume was dependent not only upon permeability heterogeneity but also its correlation length. As the permeability variation increased, the total amount of trapped CO2 increased due to effect of capillary trapping, although CO2 trapped by residual and dissolution trapping decreased. The lateral correlation length of permeability field affected spatial distribution of CO2 but did not have significant effect on the amount of CO2 storage and leakage.
부력에 의해 상승하는 CO2는 모세관 진입압력이 부력보다 높은 특정 영역에 도달하였을 때 모세관 장벽에 의해 더 이상 유동하지 못하고 집적되는 모세관격리를 나타낸다. 본 연구에서는 모세관 격리가 반영된 대염수층의 불균질성에 따라 변하는 CO2의 저장량과 누출량을 측정하기 위하여 CO2 지중저장 모델에 대한 수치 연구를 수행하였다. Leverett J-함수를 적용하여 지층의 불균질성에 따라 서로 다른 모세관압을 갖도록 설정하였다. CO2의 대수층 내 유동양상은 투과도의 불균질도와 상관길이에 영향을 받는다. 본 연구의 결과에 따르면 투과도의 변화가 심할수록 CO2 잔류격리량과 용해격리량은 감소하였지만, 모세관격리 효과로 인하여 총 격리량은 증가하였다. 투과도의 수평 상관길이는 CO2의 공간적 분포에는 영향을 미쳤지만 CO2의 저장량과 누출량에 미치는 영향은 미미하였다.
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 51
  • No :5
  • Pages :653-667