Abstract: The lithology, diagenesis, pore types, pore structure and main controlling factors of the Toutunhe reservoir in Lu well 9 in Jurassic are investigated. It is indicated that the reservoir heterogeneity of the work area is obviously controlled by the sedimentary microfacies. The proportion of excellent and good reservoirs is very small. They are scattered and mainly distrubited in northeastern part. The lithologic character of Toutunhe reservoir has obvious rule in the section and overall displays a finingupward rhythm. The connection of reservoir sandbodies in the northsouth direction is better than that in the eastwest direction, and is dominated by the composite type.

Key words: reservoir, heterogeneity, pore structure, Toutunhe Formation, Luliang Oilfield, Junggar Basin