关键词: 准噶尔盆地, 东部, 构造模式, 断裂, 基底, 油气勘探

Abstract: Based on the study on the regional structure in peripheral areas in eastern Junggar Basin, the authors identified that the study area are dominated by the north-west trending fault system in late Hercynian orogeny, northeast bending fault system in the Indo-China-Yanshan movement and pro-east-west trending fault system in Himalayan movement. In addition, it also made discussions on formation and distribution of three ty pes fault systems. According to the tectonic history in the region and extent of tectonic involvement, the tectonic styles here are classified into two major categories, namely, basement involvement and cap formation involvement, with & subtypes. The paper also indicated formation, evolution and distribution of different types OI teeton1c styles. Lastly, with view to the evolution characteristics and development history of the basin,the paper made discussion on the basis and evidence of the control of structures over oil generation, and demonstrated that the hydrocarbon Preservation condition, hydrocarbon resource amount per u- nit and evolution of hydrocarbon source rocks in the north and east of the study area are at a disadvantage comparing with those of Jimsar sag. It is concluded that the basement involvement structural type is the dominant factor affecting the oil and gas accumulation and distribution in this area,and that Jimsar sag should be a practical district for exploration at present in the study area, and Hongqi fault block, Jizhong anticline ought to become the target for near-future exploration.

Key words: Junggar basin, east, structural model, fault, basement, oil and gas exploration