Abstract: This paper discussed the effect of wettability and permeability of matrix and fracture on imbibition displacement process by applying COMP simulation software of SSI Co.in USA, and concluded that wettability of rock has obvious effect on imbibition velocity of matrix, that is, the stronger wettability reservoir, the faster imbibition velocity, suitable for production with higher oil recovery rate, so does permeability of matrix on imbibition velocity.But if matrix permeability is low, higher recovery rate is not allowed to use due to its low imbibition displacement velocity.Permeability of fracture has a distinct effect on oil displacement processes of whole matrix-fracture system.If fracture permeability is too high, the whole oil displacement process of the reservoir might be too short, resulting in low recovery factor under unfinished imbibition displacement process of matrix.

Key words: Fracture, Wettability, Efficiency, Injection rate, Oil recovery rate, Recovery factor