应用多指标综合评价方法研究中高渗储层物性差异时变特征

APPLICATION OF MULTI-INDEX COMPREHENSIVE EVALUATION METHOD TO STUDYING TIME VARYING CHARACTERISTICS OF PHYSICAL PROPERTY IN MIDDLE-TO-HIGH PERMEABILITY RESERVOIRS

中高渗储层在长期注水开发过程中,储层物性特征发生了显著变化,准确、精细描述这种变化是建立特高含水期油藏地质模型的关键。应用动静态资料,采用多指标综合评价方法,通过计算不同沉积微相、层内不同部位的孔隙度、渗透率变化系数,求取特高含水期储层孔隙度、渗透率。利用该方法计算的结果与密闭取心井分析结果一致。

In middle-to-high permeability reservoirs,their physical property may change obviously during long period of waterflooding development.So,describing these changes accurately is the key to establish a reservoir geologic model in high water-cut stage.In this study,combing with dynamic and static data,a variation coefficient of both porosity and permeability is calculated for different sedimentary microfacies and different layers by a method of multi-index comprehensive evaluation.Finally,reservoir's porosity and permeability in the high water-cut stage are obtained.Moreover,the obtained results are agreement with ones analyzed from sealed coring well.