Abstract: The third resources assessment on Junggar basin revealed its great petroleum resource prospects of the Jurassic system for its broad distribution and low degrees of proved reserves. Since Himalayan tectonic movement, the noth Tianshan mountain has been activated increas-ingly toward the north by thrust mode,causing the rapid subsidence of southern margin of Junggar basin and even tilting toward the south. The Jurassic strata appear the south-tilted regional monocline. Two unconformities just regionally occur between the Jurassic and the Cretaceous and between Xishanyao formation and Toutunhe formation of the Middle Jurassic. Furthermore, large-scale fluv ial-delta system,delta front facies and channel sandbodies developed within the Jurassic, which provide solid foundations for shaping the non-structural reservoirs in it. This paper presents and discusses in detail the favorable areas for exploration of these reservoirs of Jurassic in different zones. These are of great signifi-cance for further petroleum prospecting in Junggar basin.

Key words: Junggar basin, Jurassic, non-structural reservoir, exploration, prospecting