Abstract
The reservoir of Beierxi-Puyizu in Sabei developed area comes into the special high water-cut stage. The distribution of residual oil at the later stage of polymer flooding is disperse quietly. The contradiction in layer or among layers is complex, the range of measure reduces gradually and routine measure takes effect poorly. According to the parameters such as permeability and formation capacity, the six sedimentary units of the block are divided into four flow units, the result will provides a more credible geological reference for the identification of single runway in complex channel sand and the adjustment of measures at the later stage of polymer flooding. The microfacies of the adjacent flow units are different, they are generally flow unit of margin facies belt. At the same time, the saturation of residual oil at the juncture of different microfacies belt is high. There is little residual oil exists in the channel sand flow unit of good type and more exists in very good type, it is the target of residual oil tapping at the middle and later stage of polymer flooding. The residual saturation of the flow unit in intermediate belt is high, but there are so many difficulties in tapping the residual oil.
Published Version
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