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Deep tight reservoir characteristics and main controlling factors of Badaowan formation in the central Junggar basin

Sun Jing;Xue Jingjing;Zeng Delong;Wang Ran;Wang Feng;Li Hui;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina;  
Tight reservoir macroscopic and microscopic characteristics and main controlling factors of quality of lower Jurassic Badaowan formation in Mosuowan-Mobei area of Junggar basin were studied by using integrated cores,well logging,thin section identification,scan election microscope(SEM)and analysis assay data.The results show that it is the typical deep low and ultra-low porosity and permeability tight clastic rock reservoir.Reservoir sand body is mainly shallow water delta front subaqueous distributary channel fine and middle-fine lithic sandstone,compositional maturity and cement volume fraction are low,debris and plastic lithic volume fraction are high.Diagenesis mainly includes destructive pressure solution and cementation and constructive dissolution.The pore in vertical is mainly located in two porosity evolution zones,the mixing-stable and secondary-increasing.The pore throat is the middlefine pore-fine throat with poor size,distribution,sorting,connectivity and percolation ability.The main controlling factors of reservoir quality(physical property)are sedimentary facies,diagenesis and abnormal pressure which together determine original and present physical properties of reservoir.The results provide a basis for further exploration and development of deep tight oil and gas reservoir in the basin.
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