安塞油田长6特低渗储层特征

安塞油田长 6储层属三角洲前缘相沉积砂体 ,储层分布广泛 ,厚度稳定 ,为正反旋回砂体叠加沉积 ,是一个典型的特低渗透油藏 .通过大量的室内分析资料 ,对储层的沉积特征、孔隙微观结构特征、物性分布特征以及在纵横向上的差异作了深入的分析 ,对渗透率剖面进行了综合分类 .长 6特低渗储层渗透率剖面主要分为三大类 ,不同的剖面类型对油井产量及注水开发效果有不同的影响 .分析可为特低渗油田控水稳油及稳定产量提供可靠的地质基础 .

Characteristics of Chang-6 Extra-low Permeability Reservoir in Ansai Oil Field

Chang 6 reservoir is a depositional sandbody of delta front facies. The sandbody is the superposition of forward and reverse cyclothems. It distributes widely and has homogeneous thickness. It is a extra low permeability reservoir. According to a large quantity of laboratory data, the authors analyze the characteristics of sedimentation, pore microstructure and physical property distribution of the reservoir, and analyze also the difference of the physical property distribution in longitudinal and horizontal directions. The permeability profile of the reservoir is divided into three types. It is held that the different type of the permeability profile has different effect on the output of oil wells and the result of waterflood development. The results of the study in the paper supply geological basis for controlling water and stabilizing oil output in the oilfield.