碳酸盐岩缝洞型底水油藏的储集空间主要由缝、洞组成。在开采过程中，底水锥进机理与常规底水油藏有所区别，有必要对其进行研究。根据塔河油田缝洞型底水油藏缝、洞分布不均匀及非均质性较强的特点，将储层抽象成为渗透率突变的地质模型，定义渗透率突变系数和区域半径比，并基于达西定律，利用常规底水油藏Dupuit 临界产量公式推导出了缝洞型底水油藏油井的临界产量计算方法，继而分析了渗透率突变系数和区域半径比在油井钻遇不同部位情况下对油井临界产量的影响。

The heterogeneity of the reservoir ofOrdovician systemin Tahe Oilfield is serious, and the water-oil relation is complex, water breakthrough in the oil well is the main reason that causes production drawdown. The sources of the water body in the water breakthrough well include the leakage fluid and the acid fracturing fluid remained, relic water in the bottom of the fracture-cave unit. The water body in the lower part of the fracture-cave unit is connected by acid fracturing. The output of the leakage fluid always presents the pattern of water cut decline which has lowinfluence on the production. The output of the relic water and the water body in the lower part are different because of the energy of the water body, the height of the oil-water contact and the difference of the vertical permeability. It is a effective way to enhance the ultimate degree of reserve recovery in the reservoir that take steps to stabilize oil production and control water cut of the different resources of the water body and different characteristics ofwater breakthough.