用概率模型方法确定卞东油田高渗通道地质参数的研究

油层的非均质性主要体现为渗透率分布的不均匀。由于沉积物及地质作用的影响，渗透率在纵向上的分布具有随机性的一面，因此可以用概率统计方法来描述渗透率在纵向上的分布规律。以卞东油田为研究对象，通过测井解释资料或常规监测资料建立卞东油田渗透率分布函数，用数值方法计算了油水井含油层段的高渗通道地质参数，包括渗透率及其厚度和孔道半径；定量估计了油层的非均质性，对比概率模型计算结果与示踪剂产出曲线数值分析结果，

PARAMETER DETERMINATION FOR HIGH PERMEABLE CHANNELS IN BIANDONG OIL FIELD BY PROBABILITY MODEL

The heterogeneity of an oil reservoir is mainly characterized by the non-uniformity of permeability distribution. Because of theeffects of the sediments and the geological functions on the permeability, the vertical distribution of permeability has a ran-domness. Thus, this distribution can be described by statistical probability methods. This paper builds up a probability modelof vertical permeability distribution for the Biandong oil field by log analyses or other measurements, calculates formation pa-rameters, including permeability, thickness and pore radius, and quantitatively estimates the reservoir heterogeneity. Bycomparing the calculations with the tracer analyses, it can be seen that the results by two methods are approximately thesame, indicating the oil field has high permeable channels in which grain plugging agent can be well used, and this provides areliable geological basis for the design of water shutoff and profile modification by polymer injection at the high water cutstage of the oil field.