Abstract: This article proposes the queries on traditional organic source sag theory and new geological interpretation on three major petroleum-enriched belts in Junggar basin, suggesting that these belts are resulted from inter-existence and interaction among the specific deep crust structures in this petroliferous basin such as upper mantle upwarp, low-velocity high conductivity strata in middle-lower or middle-upper crust, crust-mantle fault mainly developed near south-north direction and the sedimentary cap rocks over them. Meanwhile, this article proposes novel thought and measures completely different from the old or traditional organic source sag theory for further exploration in Junggar basin.

Key words: deep crust structure, mantle-derived diapiric structure, subducted collision fault-zone