The processes of flooding-water flooding,polymer flooding and ternary combination flooding-were simulated respectively on a 2-D positive rhythm profile geological model by using the ASP numerical modeling software developed by RIPED [1].The recovery coefficient,remaining oil saturation,sweep efficiency and displacement efficiency were calculated and correlated layer by layer.The study shows that the displacement efficiency and sweep efficiency play different roles in different layers for such highly heterogeneous reservoirs.The displacement efficiency contributes mainly to the high permeable zones, the sweep efficiency to the low permeable zones,both of which contribute to the middle permeable zones.To improve the sweep efficiency in the low permeable zones is of significance for enhancing the whole recovery of the reservoir.It points to an important way for improving the effectiveness of chemical flooding in the highly heterogeneous reservoirs by injecting a ternary combination slug after profile control.
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