关键词: 多孔介质, 目前油水界面, 采油速度, 碳酸盐岩油藏, 华北地区, 水驱油特征, 含水饱和度, 油水分布, 裂缝系统, 含水率

Abstract: Through the study of sixteen carbonate reserviors in North China region,this paper reviews the characteristies of the water-oil displacement and the distribution of oil and water in porous medium.It is pointed out that the original oil-water interface is not a mirror-like plane,instead,it is an oil-water transition zone with different levels.In the course of development,this zone may be vertically divided into four parts: i.e.clean oil area,two-phase area,watered out area and clean water area.The oil-water interface observed only reflects the rising level of bottom water in the fracture system,with transition zones discernible both above and below it.Based on data from production,the paper further points out that the principal factor affecting displacement efficiency is the rate of production.Due to the great difference of contributions of the dissimilar pore throats and fractures to total permeability,the fracture systems play the controlling role in water-oil displacement.A reasonable production rate may bring about better results in water-oil displacement,while a higher rate will reduce recovery.