储层动态流动单元研究——以别古庄油田京11断块为例

Reservoir dynamic flow unit models of Jingll block in Bieguzhuang Oilfield

流动单元是油气储集最小宏观地质单元,它综合反映了储层的岩性、物性及微观孔喉特征。在分析流动单元定义的基础上,针对高含水期油田开发,提出动态流动单元的概念和定量划分方法。以别古庄油田京11断块为例,从取心井入手,通过优选参数,将储层流动单元划分为4种类型,建立了各类流动单元的数学判别函数,对非取心井进行了流动单元划分,并应用序贯指示模拟建立了不同含水期动态的流动单元模型。研究表明,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。实践证实了动态流动单元对剩余油预测的准确性,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 one in oil and gas reservoir,which reflects reservoir lithology,physical features and microscopic pore throat characteristics. Based on the analysis of the definition of flow unit, a new concept of dynamic flow unit and its quantitative classification methods are advanced especially for the high water cut oilfield development. Taking Jing11 block of Bieguzhuang Oilfield as an example, the reservoir flow units are divided into four types after parameter optimization in cored holes and discriminant functions for each type of the flow units are set up. The flow units of non - cored holes are classified too. Sequential indication simulation methods are applied to establishing the dynamic flow unit models at different water cut stages. It is indicated that the flow unit types at different water cut stages change dynamically and are controlled by reservoir physical features and fluid properties. The dynamic flow units can be used to describe the dynamic change of reservoir zones with similar oil and water movement at different water cut stages. The distribution of remaining oil at different development phases has close relation with the reservoir dynamic flow units. The practice proves the accuracy of the prediction of the remaining oil by the dynamic flow units. Using the dynamic flow unit method would be more significant on prediction of the remaining oil distribution and enhancing oil recovery in oilfield at high water cut stage.