准噶尔盆地红车断裂带同生逆冲断裂特征

将准噶尔盆地西北缘红车断裂带分成4个断裂亚带：红山嘴逆冲断裂亚带、中拐反冲断裂亚带、车排子近NS向逆冲断裂亚带和车75井—车77井NW向逆冲断裂亚带,并分析各断裂亚带的平面分布特征及形成机制,再运用断裂生长指数和断距分析方法对典型构造剖面进行研究,认为同生逆冲断裂多数是前缘主干断裂,为高角度基底卷入型叠瓦冲断构造,对二叠系、三叠系和侏罗系底部的沉积有明显控制作用。二叠纪逆冲推覆剧烈,逆冲断裂普遍发育,三叠纪断裂发育强度由北向南呈减弱趋势;侏罗纪断裂发育表现为北部地区较弱,中部地区较强,南部地区几乎停止的特点。二叠纪到三叠纪断裂发育为前展式,三叠纪到侏罗纪断裂发育为后展式。

Structural features of contemporaneous thrust faults in Hongche fault belt of Junggar Basin

Hongche fault belt in northwest margin of Junggar Basin is divided into four fault subzones, including Hongshanzui thrust fault, Zhongguai thrust fault, Chepaizi thrust fault in NS direction and Che 75-Che 77 well thrust fault in NW direction. The plane distribution and forming mechanism of each thrust fault are analyzed. The growth index and fault throw are applied to study the typical structural section. The result shows that most of the contemporaneous thrust faults are main front faults and high angle imbricate thrust structures with basement involvement. The contemporaneous thrust faults are considered to be closely related to the deposits in the Permian, Triassic and Jurassic bottom. The thrust-napping was intense in Permian, as a result, the thrust faults developed universally. The developing degree of the faults in Triassic weakened from north to south. While in Jurassic, the faults developed well in the middle part and poor in north part, and stopped developing in south part of this of the contemporaneous thrust faults is piggyback propagation, and it is area. From Permian to Triassic, the development overstep propagation from Triassic to Jurassic.