低渗透油田储层连通关系动静态综合评价方法

葡西油田G137区块水驱控制程度达79%，而油田却有50%以上油井因注水不受效关井，说明仅用水驱控制程度评价注采系统的适应性已经不能满足油田开发的需求。将注采系统研究中连通关系细分为静态连通和动态连通，并提出有效连通系数概念，即注水受效厚度与砂体静态连通厚度的比值；将常用的真水驱控制程度定义为视水驱控制程度和有效连通系数的乘积。该方法实现了静态连通和动态连通的分阶段评价。应用该方法分析了葡西油田试验区和G137区块注水受效差的本质区别，前者是由于砂体规模小、静态不连通所致，后者则是因为储层物性差、动态不连通所致。因此，对于低渗透油田，将油田开发的水驱控制程度考核指标分解为视水驱控制程度和有效连通系数进行考核更为合理。

Dynamic and static comprehensive evaluation method for reservoir connectivity of low-permeability oilfield

The water drive control degree of block Gu137 in Puxi Oilfield is 79%,while more than 50% of the oil wells in the oilfield are not affected by water injection,indicating that the adaptability evaluation of injectionproduction system by water drive control degree cannot meet the demands of oilfield production. Therefore,the connectivity relationship in the research of injection-production system was subdivided into static connectivity and dynamic connectivity,and the concept of effective connectivity coefficient was proposed,which is the ratio of the thickness of the water injection effect to the static thickness of the sand body. The commonly used(true) water drive control degree was defined as the product of apparent water drive control degree and effective connectivity coefficient. The method implements a phased evaluation of static connectivity and dynamic connectivity. This method was used to analyze the essential difference of poor water injection efficiency between the test area and G137 block in Puxi Oilfield. The former is due to the small size of the sand body and static disconnection, while the latter is due to poor physical properties of the reservoir and dynamic disconnection. Therefore,for lowpermeability oilfields,it is more reasonable to decompose the water drive control degree assessment index of oilfield development into visual water drive control degree and effective connectivity coefficien.