Abstract: It is shown that Zhundong area is a wide marginal mountain area in eastern Junggar basin, in which the chessboard-like structures formed by SN and EW faults, anticline and syncline occur, by the analysis of the changes of present basement and tectonic topography, paleo-structures of east Junggar marginal region. The south segment of Zhangbei uplift is a typical faulted-fold belt, formed by the thrusting from west to east. The 3D structures in different stages since Permian show that the SN faults of basement control the SN distribution of Zhangbei slope and uplift as well as the sub-fault formations in cap rocks. Based on analysis of fault systems of Zhundong-Zhangbei uplift, this paper discusses the relationship between fault systems and oil-gas accumulations in it. It is recognized that the SN fault is a good channel for oil-gas migration. And the several potential oil and gas traps and belts could be in the slope area of west Zhangbei faulted-fold belt, middle-east part of Jimusaer depression, footwall of Huobei fault and southern Shiqiantan depression.

Key words: Zhundong-Zhangbei uplift, structural framework, fault system, oil-gas accumulation