Abstract: The reservoir features of second member of Jurassic Sangonghe Formation in Moxizhuang area of Junggar Basin, have been studied by various means. The results show that reservoir rocks have relatively low composition maturity and high geometry maturity. Porosity of the reservoirs mainly belongs to very low to middle standard and permeability mainly belongs to extremely low to middle standard. The oil-bearing condition of reservoir is mainly controlled by permeability when porosity is high to 10%. Main pore types are primary intergranular pore, corrosionmodification intergranular pore and intragranular corrosion pore. Pore family is dominated by special large pore and throat family is dominated by micro-throat. Diagenesis types are compaction, cementation, alteration and replacement, and diagenesis stage is at A sub-period of late diagenesis period. Compaction and cementation cause reservoir porosity decreasing about 24.5% and corrosion causes reservoir porosity increasing about 4.5% during the diagenesis period.

Key words: Sangonghe Formation, reservoir, characteristics of petrology, characteristics of porosity and permeability, pore geometry, diagenesis, Moxizhuang area