摘要
The Permian Fengcheng Formation reservoir in the Urho area of Junggar Basin is a typical tight oil reservoir.Based on the core description,thin section identification,comprehensive data of sedimentology and physical property,this paper discusses the reservoir characteristics and controlling factors of the Fengcheng Formation in detail.It determines that dolomitized rocks are the main rock types of the reservoir.The reservoir development is multiply controlled by sedimentary facies,diagenesis,tectonism and overpressure.The reservoir type is controlled by two small blocks with different tectonic settings in the fault zone and the slope area.The fracture reservoir and pore-fracture reservoir are mainly developed in the fault zone,and the fracture-pore reservoir is mainly developed in the slope area.The semi-deep to deep lacustrine facies is the background condition,the argillaceous dolomite and dolomitized mudstone are the material foundation,the fracturing and dissolution is necessary to improve the reservoir quality and generate superior reservoir,and the overpressure is usually the "sweet spot" in a tight oil reservoir.
