特低渗油藏储层微观孔喉分布特征与可动油评价——以十屋油田营城组油藏为例

借助室内孔渗分析资料和压汞测定的毛管压力资料,分析了特低渗透油藏储层的微观孔喉结构特征,其重要特点是微观孔喉细小,孔喉分布的非均质性严重,导致储层的渗透率较低,束缚水饱和度高,残余油饱和度高。应用边界层理论,明确了孔喉内微观可动油的定义,建立了微观可动油的划分界限,并把特低渗储层内的原油划分为水驱可动油和水驱难动油。应用该方法对十屋油田营城组油藏的储量进行了评价,评价结果与核磁共振方法评价的结果基本一致。 

Distribution feature of micro-pore and throat and evaluation of movable oil in extra-low permeability reservoir:A case study in Yingcheng Formation,Shiwu Oil Field

Based on the laboratory analyses of porosity and permeability as well as the measurement of capillary pressure by mercury injection,the features of micro-pore and throat in extra-low permeability reservoirs have been studied.The micro-pore and throat radius is small,and the distribution of pore and throat is characterized by strong heterogeneity,resulting in the low permeability of reservoir and the high saturation degrees of irreducible water and oil.Movable oil in micro-pore and throat is defined using bo...