During the development of Weizhou 11-X oilfield,with the increasing degree of water flooding,the reservoir physical properties,pore structure and clay mineral content have changed to different degrees,these changes are of great significance to the identification of water flooded reservoirs and the study of residual oil distribution in the later stage.In this paper,core displacement experiments with different displacement times are carried out,and the reservoir characteristic parameters are compared before and after water flooding,to clarify the changing law of the reservoir before and after water flooding and the main controlling factors affecting the geological characteristics of water flooded zones.The study shows that the changes of reservoir parameters in water flooded reservoirs are mainly caused by the interaction between formation water and injected water during development,mainly the migration of formation particles and the changes of clay minerals.Along with the underground liquid flow to the particle erosion,it produces the dispersion and the migration phenomenon,thus causes the reservoir physical property change.
关键词
水淹层/驱替实验/储层物性/孔隙结构/黏土矿物
Key words
water flooded layer/displacement experiment/reservoir physical property/pore structure/clay mineral
维普
万方数据