Abstract: Fang-48 fault block in Daqing oilfield is a super low permeability oil reservoir. The physical modeling studies are conducted by processes of water flooding, CO₂ flooding, CO₂ stimulation, CO₂-water alternate flooding, water-CO₂ alternate flooding. The experimental results indicate that the water breakthrough is early, water cut rises rapidly and water injectivity is low. Among the processes of CO₂ flooding, CO₂ stimulation followed by CO₂ drive allows the highest cumulative oil recovery factor, in turn declining for water-CO₂ alternate flooding, CO₂ drive, CO₂-water alternate flooding, CO₂ stimulation. In view of the cumulative gas-oil ratio, it is the highest for CO₂ stimulation, in turn declining for CO₂ drive, water-CO₂ alternate flooding, CO₂-water alternate flooding, CO₂ stimulation followed by CO₂ drive. In light of the CO₂ injectivity, it is the highest for CO₂ drive, in turn declining for water-CO₂ alternate flooding, CO₂-water alternate flooding. Considering the production response and the CO₂ injectivity, the development scheme of Fang-48 fault block should be firstly the CO₂ stimulation followed by CO₂ drive, secondly by water-CO₂ alternate flooding.

Key words: Daqing oilfield, low permeability reservoir, CO₂, development scheme, recovery process, physical modeling