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| SEALING EFFICIENCY OF COMBINED CAPROCK FOR CO2 STORAGE IN SALINE AQUIFER |
| KONG Weizhong，BAI Bing，LI Xiaochun，WEI Ning |
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract Under he background of Shenhua Ordos CCS demonstration project，the Liujiagou formation and its upper caprocks as the combined caprocks was taken to research its sealing effects. The results show that the sealing efficiency of combined caprock is very significant. The existence of thin reservoirs in combined caprocks results in a lower pressure building and a higher CO2 injection rate. Therefore，combined caprock can not only effectively sequestrate the carbon dioxide but also can make full use the storage capacity of the thins reservoirs in between the multiple caprocks. The concept of combined caprock is of great significance to better the storage capacity evaluations and improve the standards of site selection.
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2015, Vol. 34 
