油层的非均质性主要体现为渗透率分布的不均匀。
The heterogeneity of an oil reservoir is mainly characterized by the non-uniformity of permeability distribution.
油藏非均质性严重，就会导致平面上水线推进不均匀，使生产井过早见水或水淹，从而影响水驱面积波及系数的大小。
Reservoir heterogeneity can lead to uneven waterline forward on flat moreover that will result in water breakthrough too early. Thus the area sweep coefficient was affected.
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