FORMATION AND DISTRIBUTION OF HYDROCARBON RESERVOIRS IN THE NORTHERN SLOPE OF THE YIHEZHUANG ARCH, THE BOHAIWAN BASIN

The northern slope of the Yihezhuang Arch is a typical multiple oil and gas accumulation zone consisted of multiple oil-bearing series and multiple reservoirs types. Due to influence of tectonic movements, sedimentary break and other factors, traps and reservoirs were complicated and diversified. Based on the study of pool-forming factors such as reservoir, oil-source, trap and so on, the types, control factors and distribution of hydrocarbon accumulations in the northern slope of the Yihezhuang Arch were summarized. It was suggested that the subtle reservoirs such as those formed in buried-hill, unconformity and stratigraphic overlap were major targets for future exploration in the area.