Sedimentary system and lithologic reservoirs accumulation modes of Dongying formation in Gaoliu area,Nanpu sag

Affected by terrigenous clastic supply change of Dongying formation in Gaoliu area,Nanpu sag,reservoirs are characterized by multiphase superposition and quick lateral changes,and there is a great difficulties in reservoir prediction.Through systematic study on sedimentary provenances and sedimentary system of Dongying formation in Gaoliu area,the sedimentary provenance directions and space-time distribution characteristics of Dongying formation have been made clear.On the basis of sedimentary system study,lithologic reservoir accumulation modes at different sedimentary systems have been established.The study results indicate the sedimentary provenances of Dongying formation mainly come from uplifts of Baigezhuang and Mayingtou.Dongying formation of Gaoliu area mainly developed fan delta,half deep lacustrine-deep lacustine sedimentary systems,the reservoir systems can be divided into steep slope zone and gentle slope zone,and the reservoir types mainly include the updip pinchout reservoirs,lens,overlapping unconformity and fan root lateral sealing reservoirs.The slope hydrocarbon reservoirs of Dongying formation in Gaoliu area are obviously controlled by sedimentary characteristics and the lithologic reservoir is an important area for exploration in the next step.