There are three types of shallow reservoirs controlled by different key factors for hydrocarbon accumulation in the North Jiangsu Basin,respectively controlled by low maturity and high efficiency oil source rock in the lower-middle part of the Fu2 Member,fault of vertical migration pathway,and large scale sandstone for lateral migration.

Overview of research into formation mechanism and distribution law of stratigraphic reservoir

The sequence boundaries controlled distribution of stratigraphic reservoir.

The main reservoir types were anticlinal reservoir, fault reservoir, lithologic reservoir, heavy-oil sealing reservoir and composite reservoir in Wuerhe-Xiazijie Area, and heavy-oil sealing reservoir was a typical one.

Its trait of basin evolution and space-time distribution of hydrocarbon source rock,tectonic development characteristics and oil-gas migration-accumulation modes decide the fact that the main type of the large oilfields is the stratigraphic oil-gas reservoir and that of the anticline oil-gas reservoir is secondary,which determines the development and space-time distribution of the la.