塔东北草湖地区差异构造变形特征与动力学过程探讨

草湖地区位于塔里木盆地东北部与库鲁克塔格隆起的结合部位，该区古生界-中生界地层保存比较齐全，较完整地记录了塔里木盆地东北缘的构造演化。基于最新二维地震资料构造解释，利用断层相关褶皱分析技术，对草湖地区构造变形样式、运动学特征进行了精细解析。研究表明，草湖地区断裂变形具有“上下分层、南北分段、东西分带”的特征，断裂活动总体上具有逆冲兼压扭性质，主要发育海西晚期、印支期、燕山中期3期构造变形，均具有断层相关褶皱的几何学特征。在构造变形分析的基础上，选择典型地震测线剖面，利用平衡剖面技术，恢复了草湖地区的构造演化历史，即加里东晚期-海西早期的构造运动，奠定了研究区及周缘的隆凹格局，主要形成了阿克库勒凸起、草湖凹陷、尉犁鼻凸；海西晚期，发育逆冲滑脱断层；印支期、燕山期继承性的压扭走滑下，最终形成该区的构造格局。 

Differential tectonic deformation and dynamic processes in Caohu area,northeastern Tarim Basin

The Caohu area located in the northeastern Tarim Basin closed against the Kuluktag Lift. Paleozoic and Mesozoic strata were preserved very well, which recorded the tectonic evolution of the northeastern Tarim Basin. Based on the interpretation of the latest 2D seismic data and the theory of fault-related folding, this paper analyzed the geometrical and kinetic features of deformations in the Caohu area. Faulting deformations in the Caohu area have the characteristics of vertical stratification, S-N segmentation, and E-W zonation. Thrusts and thrust-strike slip faults were dominant. Tectonic deformation took place mainly in the late Hercynian, Indosinian and middle Yanshanian, and had the geometrical features of fault-related folds. Structural evolution history was recovered using an equilibrium profile technique. The late Caledonian to early Hercynian movements controlled the main upwarped and downwarped structural framework in the Caohu area, developing the Akekule Arch, Caohu Sag and Yuli Nose Arch. Thrust detachment faults developed during the late Hercynian, and experienced two phases of thrust-strike slip reform in the Indosinian and Yanshanian epochs, resulting in the present tectonic pattern of the study area.