Abstract: In this work, we proposed the sequence stratigraphy model of the late foreland basin (T一J) in the west Junggar boundary mountains and the prediction model of oil and gas exploration. At the edge of growth fault, the crossline of lake water and boundary fault was the edge angle of continental shelf, Major Karamay-Urho faulting zone was the folding slope zone. The depositional systems in each system tract were not all the same as matine patterns. Type Ⅰ sequence system tract included alI the composition,type Ⅱ sequence was lack of low level system tract. Type Ⅱ boundary surface was covered directly with transgtesive system tract and reflected the eustatic frequency of lacustrine level change. riassic-Jurassic was divided into 3 sequences and 4 quasi-sequences, and fan delta-tu:bidite fan and other series of reservoirs in high level system tract which was rich in and were pointed to be important targets in the future oil exploration and development.

Key words: West Junggar boundary mountains, I Foreland basin, Sequence stratigraphy