摘要
鄂尔多斯盆地合水地区长6、长8储层特征具有共同点与差异,驱油类型受均质程度控制,长6储层样品见均匀-网状、网状、指状三种驱替类型,长8储层未见指状驱替;润湿性影响残余油状态,有效渗透率越高、平均喉道半径越大、孔喉连通性越好,则驱油效率越高;长8储层样品溶蚀孔越发育驱油效率越高.以注水启动压力为基准提高50%注入压力,注入速度为0.05~0.08 mL/min,注入体积3 PV时,驱油效果最好.利用储层各项参数综合对比可预测驱油效率,选取适当的注水方式可明显提升驱油效率.
Chang 6 and Chang 8 reservoirs in Heshui area of Ordos Basin have some similarities and differences in reservoir characteristics.Controlled by the homogeneity degree,there are three types of oil displacement in Chang 6 reservoir:uniform-reticular,reticular and fingerlike oil displacement,while no finger-like displacement is observed in Chang 8 reservoir.Wettability affects the state of residual oil.The higher the effective permeability,the larger the average throat radius,the better the pore-throat connectivity,and the higher the oil displacement efficiency.In the samples of Chang 8 reservoir,the more developed the dissolution hole is,the higher the oil displacement efficiency will be.The injection pressure increased by 50% based on the start pressure of water injection,when the injection speed is O.05-0.08 mL/min,and the injection volume is 3PV,the best displacement effect will be reached.The oil displacement efficiency can be predicted by the comprehensive comparison of reservoir parameters,and the oil displacement efficiency can be improved obviously by selecting the appropriate water injection method.
作者
欧阳思琪
孟子圆
OUYANG Siqi;MENG Ziyuan(Geology Department of Northwest University,Xi’an,Shaanxi 710069,China)
出处
《石油地质与工程》
CAS
2019年第3期62-67,共6页
Petroleum Geology and Engineering
关键词
鄂尔多斯盆地
合水地区
低渗透储层
微观水驱油
孔喉结构
Ordos Basin
Heshui area
low permeability reservoir
microscopic water flooding
pore-throat structure
