Sandstones in Qigu Formation of upper Jurassic are reservoirs with medium porosity and low permeability in east of Fukang sag, east of Junggar Basin. To ascertain pore evolution and diagenesis of reservoirs in Qigu Formaiton, multiple analysis methods were adopted, including cores observation of key wells , general slice and casting slice identifi-cation of sandstone, scan electron microscope ,X-ray diffraction, etc. Fine to medium sandstone is the main sandstone type, with low composition maturation and high fabric maturation. And reservoirs are mainly undergoes compaction, ce-mentation and dissolution processes. Native of intergranular pores are the main pore types, then are secondary pores. Dia-genesis reaches A-period of middle diagenesis stage, and pore evolution has close relation with diagenesis, the result shows that compaction and chemical cementation are main factors to make reservoir property bad in study area.%据重点井岩心观察资料及岩石、铸体薄片、X-衍射、扫描电镜及阴极发光等资料，对研究区齐古组砂岩储层成岩作用及孔隙演化特征进行分析。研究区齐古组储集层主要为细-中砂岩，成分成熟度偏低，结构成熟度较高。经历的成岩作用类型主要为压实-压溶作用、胶结作用和溶蚀作用。孔隙类型主要以原生粒间孔为主。齐古组砂岩主要处于中成岩阶段A期，孔隙演化与成岩作用密切相关，压实及化学胶结作用是齐古组储集层储集性能变差的主要因素。
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