Junggar Basin, located in Northern Xinjiang between Altai and Tianshan Mountains, is the second largest basin in China with its sedimentary area being about 130,000 square kilometers. A group of caprocks are developed over Carboniferous of the basin, including the Permian, Triassic, Jurassic, Cretaceous, Paleogene, and Neogene, among which the biggest sedimentary caprock is 15,000 meters thick. The formation and accumulation of oil and gas in the basin can be characterized by multistage and multisource after undergoing multiperiod structural movements such as Late Hercynian, Indosinian, Yanshanian, and Himalaya, etc. Junggar Basin, located in Northern Xinjiang between Altai and Tianshan Mountains, is the second largest basin in China with its sedimentary area being about 130,000 square kilometers. A group of caprocks are developed over Carboniferous of the basin, including the Permian, Triassic, Jurassic, Cretaceous, Paleogene, and Neogene, among which the biggest sedimentary caprock is 15,000 meters thick. The formation and accumulation of oil and gas in the basin can be characterized by multistage and multisource after undergoing multiperiod structural movements such as Late Hercynian, Indosinian, Yanshanian, and Himalaya, etc.