Abstract: In view of the complex water-oil relations of lithology reservoir in hinterland of Junggar basin, the sequence stratigraphic classification and correlation are conducted by comprehensive researches of core, logging, well logging and seismic profile. The result shows that a sequence boundary is identified inside member 2 of Sangonghe formation of Lower Jurassic, which is characterized by lithology of scour surface and conglomerate and gravel bearing gritstone over it, and by well logs of abrupt contact. The boundary can be identified and traced for correlation on the gamma inverse profile. In HST beneath the boundary have good interconnecting sand body, poor lateral sealing, and no oil shows; in LST and TST above it have delta distributary channel sand reservoir with serious heterogeneity and good lateral sealing, being oil layer. Hence, tracing this boundary and searching for the delta distributary channel sands in LST and TST will be the key for petroleum exploration in this area.

Key words: Junggar basin, Jurassic, sequence, boundary