Abstract: Junggar basin is located in northern Xinjiang and has an area of 13×10⁴ km². More than 30 oil and gas fields have been found up to now. The study shows that this basin has crystalline and metamorphic basement of pre-Sinian, and develops broad Paleozoic sediments under control of latitudinal Xiyu system and NE-trending tectonic system. The prototype of the basin is composed of the riftedcratonic basin of Sinian-Ordovician, the compressional rifted-cratonic basin of Silurian-Devonian and the craton-like depression basin of Carboniferous-Permian. There exist three sets of source rocks of the Cambrian-Ordonican, the Lower Silurian and the Carboniferous- Permian, which contain very abundant hydrocarbon resources and play important roles in petroleum exploration at present and for the future. It is suggested that the northwestern Junggar basin, the northern Junggar basin and Luliang area are the favorable domains for exploration of oil and gas fields of Paleozoic.

Key words: Junggar basin, tectonic system, sedimentary facies, oil-gas field, exploration target