Abstract: Dibei gas reservoir is located in the center of Dibei slope, eastern Kuqa depression in Tarim basin. The main reservoir is the Jurassic Ahe formation, the secondary reservoir is the Jurassic Yangxia formation. Dibei gas reservoir belongs to a tight sandstone gas reservoir, which is characterized by tight reservoir, source?reservoir paragenesis, persistence accumulation and late adjustment. Considering the source rocks, the reservoir?cap assemblages and the structures, it is predicted that tight gas reservoir may exist widely in the Jurassic of the eastern Kuqa depression and could be of great potentials for gas exploration