Sedimentary characteristics,hydrocarbon distribution and controls on the middle submember of the 3rd member of the Shahejie Formation in the Dongxin Oil Field,Dongying depression

The lithologic oil pools and lithologic-structural pools oil are well developed in the slide turbidite fans,slump turbidite fans,distal turbidites and fluvial submarine debris flows deposits in the middle submember of the 3rd member of the Shahejie Formation in the Dongxin Oil Field,Dongying depression.Vertically,the prolific horizons mainly are involved in the parasequence sets PS7 to PS5 within the early regressive systems tract,followed by PS8 within the transgressive systems tract.By and large,the hydrocarbons are better enriched in the western parts than in the eastern parts.The hydrocarbon reservoirs are dominantly hosted to the slump turbidite fans,distal turbidites and slide turbidite fans.The main controlling factors contain macroscopic sedimentary facies zones,tectonism,microscopic physical properties and diagenesis.