The Characteristics Of The Permian Oil Reservoirs In Bai 25 Well Area Of Northwestern Margin Of Junggar Basin

The Permian reservoirs in the Bai 25 well area in the northwestern margin of the Junggar Basin are distributed in the Fengcheng Formation and the Wuerhe Formation.In order to make clear the reservoir formation characteristics and main controlling factors of Permian reservoirs in this study area,This paper based on the study of predecessors which based on petroleum geology,reservoir theory,reservoir characteristics and main controlling factors of reservoir distribution,further research on the reservoir characteristics and reservoir model.Obtain the following:The Fengcheng Formation is the main hydrocarbon source rocks of the Permian reservoir in the study area,the reservoirs provide a place for the reservoirs of the Permian oil and gas.The P₁f₂ reservoir of the in the Bai 25 well area is a reservoir with low composition maturity,low structural maturity,low porosity and permeability.The P₃w₁ reservoir is a reservoir with low composition maturity,low structural maturity,low porosity and low permeability.the fractures,unconformity and permeable sandstone of the study area are the main channels of oil and gas migration in the Permian reservoir.The effective traps formed under the control of tectonics,stratigraphy and lithology provide a place for oil and gas accumulation.The main controlling factors of Permian reservoir formation in the study area are tectonics,stratigraphy and lithology,and the Permian reservoir distribution is related to fracture and unconformity.Based on the above research,We build the compound model of oil and gas accumulation in the study area,which is“the unconformity for source migration of the slope area-the migration in fractures of the fault zone-the fan control oil reservoir”.The oil and gas generated by the source rocks of the Fengcheng Formation in the MaHu depression occurred long-distance lateral migration through the sand body and unconformity along the uplift direction of the slope.The oil and gas in tectonic belt and the fault zone were dominated by vertical migration.Finally,oil and gas accumulation in the study area effective traps.