Abstract: Chaiwopu seg in southeastern Junggar basin went through 4 stages in its development and evolution since Late Carboniferous, deposited multiple source rocks, reservoir rocks and cap rocks. The Lucaogou formation and Hongyanchi formation of Upper Permian are regarded as major source rocks and main prospecting target; Upper Triassic-Jurassic as regional cap rocks, the major source rocks are more developed in north than south, but their maturity of organic matter is higher in south than in north. They entered the "oil window" in the end of Triassic and reached the peak of oil generation in the end of Jurassic, which matches the trap-forming period in west and north parts of the seg. Sangezhuang salient and near the north deep fault belt of it are the primary target for oil-gas exploration.

Key words: Junggar basin, Chaiwopu, seg, geologic feature, exploratory target