复杂山前带构造建模技术探讨——以准南阿什里地区为例

Discussion on structure modeling technology for complex piedmont zone:Taking Ashili Area of southern Junggar Basin as an example

山前带构造变形强烈,地表条件复杂,受地质、地表条件影响,地震剖面反射不清,构造解释困难。文中充分利用野外露头、地震等基础资料,建立了准南山前带阿什里地区多个初始构造地质模型。在此基础上,结合区域构造演化背景,运用平衡剖面技术验证,最终确立了相对合理的构造地质模型,并将构造样式划分为逆掩推覆带、山前变形带和前缘变形带。其中山前变形带又可分为上、下2个构造层,上构造层为侏罗系组成的宽缓背斜构造,下构造层为三叠系和二叠系组成的早期冲断构造。

Due Io the strong structure deformation in piedmont zone and complex surface, and influenced by geological and surface conditions, the reflection of seismic profile is unclear and structure interpretation is difficult. This paper built several initial models utilizing the data of outcrop and seismic profile. Based on this, combined with the regional tectonic background and with the help of balanced section lechnique, The relatively reasonable structural model was uhimately built. In the view of fault and deformation features, the structual styles of Ashili area can be divided into thrust nappe zone, foreland deformation belt and frontal deformation beh. In which, the foreland deformation belt can also be divided into upper tectonic layer and lower tectonic layer. The upper tectonic layer is consisted of Jurassic rolling anticline structure, while the lower tectonic layer is consisted of Triassic and Permian early thrust structure.