Abstract: The braided deltas in southern margin of Junggar basin as a significant type of sedimentary facies are mainly characterized by conglomerate, gravel sandstone and coarse-grained sandstone. The braided deltas, composed of the braid delta plain, braid delta front and prodelta, are dominated by the braid delta plains. The braid delta front sub-facies occupying the shallow lake is scoured by braid distributary channel sandstone and undeveloped. On the other hand, the results from measuring the outcrop samples and the integrated petroleum geological analysis show that the gravel sandstone body with better oil-gas accumulation is one of good reservoirs in this area.

Key words: Junggar basin, braided river, delta, clastic rock, reservoir, sedimentary facies, depositional feature