Formation of Paleogene Lithologic Reservoir and Distribution in Gaoyou Sag,Subei Basin
苏北盆地高邮凹陷古近系岩性油藏形成特征及分布规律

In recent years,the lithologic reservoir exploration in the Gaoyou sag has achieved major breakthroughs.By taking key factors controlling hydrocarbon accumulation of lithologic reservoirs,it is concluded that the geological conditions in the Gaoyou sag are favorable for forming lithologic reservoirs.since the time oil entrapment is at the strong filling dynamic window,the physical property of reservoirs is more profitable than that of filling critical physical property,and the lithologic traps is early developed.The lithologic reservoir accumulation was controlled by two key factors: migration pathways and trap condition in the Gaoyou sag.It is required that the main fault opened early and closed later for oil accumulation in this study.In addition,the moderate content of sandstone is available to form lithologic reservoirs.Lithologic reservoirs as a belt shape are widely distributed in the steep slope as well as gentle slope.The slope belts mainly consist of structural-lithologic and updip pinchout reservoirs,the depressed belts mainly consist of lenticular lithologic reservoirs.