A Study On Sedimentary Facies And Reservoir Characteristics Of The Qingshuihe Formation In The Hong 003 Well Area Junggar Basin

With the strategic transfer of China's petroleum resources to the western region of China,oil and gas development in Xinjiang ushered in a period of rapid development.This thesis aims to explore the effective potential tapping and production methods of regional oil reservoirs through detailed study of sedimentary facies and reservoir characteristics based on the detailed understanding of oil reservoirs,and aiming at the problems of poor production effect and difficulty in producing production in unused areas.So we provide a basis for improving the ultimate recovery of oil reservoirs in this area.The Qingshuihe Formation in the Hong 003 well area is a set of positive cyclic deposits with coarse upper and fine lower layers.The provenance in the study area comes from the Zaire Mountains in the northwest,and the direction of paleoflow is from north to south.From top to bottom,the K₁q₁sand layer group of the main oil layer of the Qingshuihe Formation is subdivided into four layers K₁q₁¹-K₁q₁⁴,of which the K₁q₁⁴layer is subdivided into the K₁q₁^4-1small layer and the K₁q₁^4-2small layer.Among them,K₁q₁³and K₁q₁⁴have good physical properties and oil-bearing properties,and are favorable target exploration areas in the Hongshanzui area.The target sand layer group in the study area developed retrogressive alluvial fan facies,and the overall flood gravity flow deposits were dominated.The main subfacies are the fan root,fan middle and fan end in the alluvial fan facies,among which the fan middle subfacies are the most developed.The main microfacies are sandy braided streamline-sandy braided streamline-fan source wetland and overflow zone.With the gradual deterioration of oil content and physical properties,it is divided into the most favorable phase zone-medium phase zone-unfavorable phase zone in turn.The Qingshuihe Formation reservoir in the study area is a set of alluvial fan deposits dominated by coarse clastics.The lithology changes drastically and the reservoir heterogeneity is serious.The overall reservoir thickness in the study area is large,the distribution is stable,and the physical properties are good.Comprehensive studies have shown that the internal structural conditions of the study area are complex,the reservoir is restricted by the lithology of the north,east and south,and there are faults in the west.It is determined that the oil reservoir in the study area is a structural lithological trap.