ANALYSIS OF OIL-GAS SOURCE AND RESERVOIR-FORMED MODEL IN WELL YONG 1 OF THE JUNGGAR BASIN

Three types of crude oil with different geochemistry characterization occur in the Jurassic formation in Well Yong 1 of the Junggar Basin.Oil-source analysis indicates that the crude oil in Xishanyao Formation derived from the Permian source rocks,the crude oil in the lower Sangonghe Formation derived from the Jurassic source rocks,and the extract of the oil sand in the upper Sangonghe Formation is the mixture from the Jurassic source rocks and the Permian source rocks.The Permian and the Jurassic is the main source rocks in the Changji Depression of the Junggar Basin.The main generation stage of the Lower Permian is from the Late Permian to the Early Jurassic,the Middle Permian is from Late Tria-ssic to the Early Cretaceous period,and the Jurassic is after the Tertiary period.By studying the structure evolution of the Changji Depression,it is showed that degradation oil accumulated in Xishanyao Formation before the uplift at the end of Jurassic,the normal oil accumulated in Xishanyao Formation after the Cretaceous formation deposited,and the oil in Sangonghe Formation from Jurassic source rocks accumulated later.