【摘要】 在区域地质背景分析的基础上,根据露头、钻井、地震资料建立了柴达木盆地芒崖坳陷中心新的构造样式:新生代早期以挤压叠瓦逆冲为主,走滑调节为辅,形成深部基底卷入型断层及相关挤压逆冲断块和挤压褶皱;新生代晚期以走滑调节为主,挤压逆冲为辅,形成浅层滑脱断层-褶皱组合,并最终定型。在构造样式确立的基础上,通过构造几何学、运动学分析,对芒崖坳陷中心地区新生代构造应力场变迁、构造层变形机制进行详尽的阐述,重塑了新生代以来该地区的构造演化历史。根据构造裂缝发育规律,指出新生代2次构造旋回的张性应力集中区,有利于裂缝储集层的发育,是下一步油气勘探的重点区带。更多还原

【Abstract】 Based on the analysis of regional geological setting,integrated with data from field outcrop,drilling and seismic interpretation,the new structural style in the center of Mangya depression was established as follows: in the Early Cenozoic,the structural style in Mangya depression is dominated by compressional,imbricated and obduction modes and fewer strike-slip adjustment,forming deep basement-involved faults,compressional thrust fault blocks and compressional folds;in the Late Cenozoic,the style in it is dominated by strike-slip adjustment and fewer compressional and obduction modes,shaping shallow detachment fault-fold assemblage,and then finalizing the styles.Based on analyses of the structural styles in geometry and kinematics,the transition of tectonic stress field and the deformation mechanism of structural zones of the Cenozoic in the centre of Mangya depression are elaborated,reconstructing the history of structural evolution in this area.Finally,according to the distribution of structural fractures,it is pointed out that the concentrated areas of tensile stress in two tectonic cycles are favorable to the development or formation of fractured reservoirs,and should be regarded as the target zones for petroleum exploration in the future.更多还原