Abstract: Based on the previous study results of whole and local sequences in Junggar basin, this paper mainly characterizes Jurassic stratigraphic framework in northwestern Junggar basin, establishes the sequential framework in Chepaizi area, and firstly describes the boundary characteristic of Jurassic sequence and system domain in it, classifies its favorable depositional facies. These offer thoughts and approaches for exploration of Jurassic subtle trap and hydrocarbon reservoirs.

Key words: Chepaizi oilfield, Jurassic, sequence stratigraphy, characteristics