• Modeling Geologic Storage of Carbon Dioxide: Effects of Low-permeability Layer on Migration of CO2
  • Han, Ahreum;Kim, Taehee;Kwon, Yikyun;Koo, Min-Ho;
  • Department of Geoenvironmental Sciences, Kongju National University;Korea Institute of Geoscience and Mineral Resources;Department of Geoenvironmental Sciences, Kongju National University;Department of Geoenvironmental Sciences, Kongju National University;
  • 이산화탄소 지중저장 모델링: 저투수 이질협재층이 이산화탄소 거동에 미치는 영향
  • 한아름;김태희;권이균;구민호;
  • 공주대학교 지질환경과학과;한국지질자원연구원;공주대학교 지질환경과학과;공주대학교 지질환경과학과;
Abstract
TOUGH2 was used to simulate the migration of $CO_2$ injected into a sandy aquifer. A series of numerical simulations was performed to investigate the effects of a low-permeability layer (LPL) embedded in the aquifer on the injection rate and the pressure distribution of $CO_2$. The results show that the size and location of the LPL greatly affected the spread of $CO_2$. The pressure difference between two points in the aquifer, one each below and above the LPL, increased as the size of the LPL increased, showing a critical value at 200 m, above which the size effect was diminished. The location of the LPL with respect to the injection well also affected the migration of $CO_2$. When the injection well was at the center of the LPL, the injection rate of $CO_2$ decreased by 5.0% compared to the case with no LPL. However, when the injection well was at the edge of the LPL, the injection rate was decreased by only 1.6%. The vertical distance between the injection point and the LPL also affected the injection rate. The closer the LPL was to the injection point, the lower the injection rate was, by up to 8.3%. Conclusively, in planning geologic storage of $CO_2$, the optimal location of the injection well should be determined considering the distribution of the LPL in the aquifer.

Keywords: TOUGH2;Geologic storage of carbon dioxide;Low-permeability layer;Sensitivity analysis;Numerical modeling;

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