Forming conditions and distribution law of stratigraphic hydrocarbon reservoirs in the south slope of Dongying sag

The forming condition of stratigraphic hydrocarbon reservoir in the south slope of Dongying sag was analyzed.In Dongying sag there are three series of hydrocarbon source rock as following: the Kong'er member,the upper Shasi submember and the lower Shasan submember.Faults,unconformity and permeable sandstone compose the spatial migration passage of oil and gas.The types of reservoir are various and distributed widely.The condition of cap rock is good.The expulsion of hydrocarbon and formation of stratigraphic trap matched well. The above shows that the stratigraphic hydrocarbon reservoirs can be formed in the south slope of Dongying sag.There are three types of stratigraphic hydrocarbon reservoir as following: stratigraphic unconformity screened reservoir,stratigraphic onlap unconformity reservoir and buried hill reservoir.These stratigraphic hydrocarbon reservoirs are mainly located in the stratigraphic onlap and denudation zone of basin skirt,especially the zone which stratigraphic onlap and denudation combines with nose structure belts.