ACCUMULATION STAGES OF STRATIGRAPHIC RESERVOIRS IN THE DONGYING SAG OF THE BOHAI BAY BASIN

The exploration degree in the Dongying Sag of the Bohai Bay Basin is gradually developing.The exploration position of stratigraphic reservoirs is continuously advancing.Comparative analysis of maturity of various crude oil and hydrocarbon source rocks showed that the maturity of stratigraphic reservoirs was high and the hydrocarbon accumulation dating was late.According to analysising the homogenization temperature of fluid inclusions of various oil reservoirs at the sub-structural belt,the hydrocarbon accumulation dating of stratigraphic reservoirs is from the final sedimentation period of the Guantao Formation to the sedimentation period of the Minghuazhen Formation.On the base of the evolution of reservoiring factors in the Dongying Sag,a stratigraphic reservoirs accumulating model was established,which correspond with tectonic history and filling history of basin,moreover it was divided into three stages: accumulation preparation stage,accumulation main stage and hydrocarbon preservation stage.