文留油田文72断块储层动态流动单元划分

Reservoir dynamic flow unit models of Wen72 block in Wenliu oilfield

针对高含水期油田开发,给出动态流动单元的概念和定量划分方法.以文留油田文72断块为例,对取心井,通过优选参数,将流动单元划分4种类型,建立各类流动单元的数学判别函数;对非取心井进行流动单元划分,并应用序贯指示模拟建立不同含水期动态的流动单元模型.结果表明,不同含水期储层流动单元类型受储层物性和流体性质的变化所控制,其分布是动态变化的,动态流动单元能够描述不同开发阶段油水运动规律相似的储集带的动态变化,不同开发阶段的剩余油分布与储层动态流动单元关系密切.实例表明,应用动态流动单元方法预测高含水期油田剩余油分布和提高采收率更具有实际意义.

Flow unit is the smallest macro-geological unit in oil and gas reservoir,and it's the comprehensive reflection of reservoir's lithology,physical feature and micro pore throat characteristics.With the definition of flow unit analysis,a new concept of dynamic flow unit and its quantitative classification methods,especially for the high water cut oil field,were put forward.This paper,taking Wen72 block of Wenliu oilfield as an example,chooses core well parameters,classifies the reservoir flow units into four types,and builds the discriminant functions for each type.Through non-core wells flow unit recognition,applying sequential indicator simulation method,we established the dynamic flow unit models of different water cut stages.It is indicated that the flow unit types of different water cut stages are dynamically changed and controlled by physical features and fluid properties.The dynamic flow unit can descript the dynamic change of storage zones with similar oil and water movement of different water cut stages.The distribution of remaining oil in different water cut stages has closely relationship with the reservoir dynamic flow units.The field measurement according to the dynamic flow units increased production and testified its validity,which shows it would be more significant to study remaining oil distribution and enhance oil recovery at high water cut oilfield using the dynamic flow unit method.