准噶尔盆地南缘构造特征与演化

为明确准噶尔盆地南缘构造特征,落实中—深层构造圈闭,寻找大型油气田,通过构建二维构造剖面,开展构造变形定量分析,建立了复杂构造模型,厘定了构造活动时间和变形机制。研究表明,南缘经历晚侏罗世和中新世2期变形,晚侏罗世发育走滑断层,形成高泉断隆带、艾卡构造带和齐古—南安集海走滑断裂带,属于准噶尔盆地周缘中生代走滑断裂体系。中新世发育逆冲推覆构造,南缘西段新生代背斜叠加在高泉断隆带、艾卡构造带之上,高探 1 井钻探证实古构造上覆发育的背斜构造是有利的勘探目标。南缘中段发育3排逆冲断层和叠加褶皱,中、下组合是油气勘探重要目标。南缘新生代逆冲推覆构造由南向北扩展,齐古断褶带和盆地深层褶皱形成于中新世初期（23 Ma）,霍玛吐断层发生在中新世末期（7 Ma）,呼图壁背斜和卡因迪克背斜形成于第四纪。

Structural Characteristics and Evolution in the Southern Margin of Junggar Basin

The understanding of the complex structures in the southern margin of Junggar basin is very important to explore the oil traps in the middle-deep strata and discover large oil and gas fields.In this paper,the structural characteristics and evolution of the fold?thrust belt in the southern margin of Junggar basin are studied based on 2D structural sections,quantitative analysis of structural deformation,and the complex structural model and tectonic activity time and deformation mechanism are determined.The research results show that the south?ern margin of Junggar basin underwent two stages of deformation in the Late Jurassic and Miocene,respectively.Strike slip faults were de?veloped in the Late Jurassic during which Gaoquan fault?uplift zone,Aika structural belt and Qigu-south Anjihai strike?slip fault formed,which were belong to Mesozoic strike?slip fault system in the periphery of Junggar basin.Thrust and fold belt were developed during Mio?cene.The Cenozoic anticline over?lapped on Gaoquan fault?uplift zone and Aika structural belt in the western section of the southern mar?gin.The drilling of Well Gaotan?1 proves that the anticline structures overlying on the paleostructures are favorable targets for exploration.Three rows of thrust faults and imbricate structures are developed in the middle section of the southern margin,and the middle and lower parts of the structures are the main targets for petroleum exploration.The Cenozoic thrust?fold belt extends from south to north in the south?ern margin of Junggar basin.Qigu fault?fold zone in the piedmont and the deep folds in the basin formed in the early Miocene(23 Ma),the Huo-Ma-Tu thrust fault occurred at the end of Miocene(7 Ma),and Hutubi anticline and Kayindike anticline formed in Quaternery.