Abstract: The Wu-Xia fault belt of Junggar basin is divided into eight second-order tectonic units based on the study on tectonic features and tectonic evolution, such as Wuerhe thrust belt, Wuerhe fault-fold belt, Wuerhe monocline belt, Wuerhe-Xiazijie thrust belt, Wuerhe-Xiazijie monocline belt, Xiazijie-Hongqiba thrust belt, Xiazijie-Hongqiba fault-fold belt and Xiazijie-Hongqiba monocline belt, which reflect the characteristics of structural segmentation in east-west direction and structural zonation in south-north direction. According to the development of structural traps and the conditions of hydrocarbon accumulation, these second-order tectonic units are studied in hydrocarbon accumulation type and distribution. It is concluded that the fault-fold types in this area are most developed and serve as major oil production areas; the monocline belts are of the greatest explorative potentials, being the favorable prospecting areas.

Key words: Wuerhe-Xiazijie fault belt, tectonic unit, petroleum reservoir