【摘要】 基于南堡凹陷实际地质条件设计了3组不同伸展方向的平面砂箱模型,根据模型试验结果与地质实际综合分析,探讨了南堡凹陷新生代断裂系统形成机制。研究结果表明:南堡凹陷新生代构造是区域南-北向伸展作用的产物,南堡凹陷的复杂断裂系统是在南-北向伸展过程的不同阶段逐步形成的;南堡凹陷新生代构造的形成主要受控于特定的边界几何条件,并非多期构造作用叠加或先存走滑断裂重新活动的结果。更多还原

【Abstract】 Based on the results of three series of sandbox models designed according to the actual geological conditions of Nanpu sag,formation mechanism of fault systems was discussed.The results show that Nanpu sag underwent S-N extension during Cenozoic period,the complex fault systems were formed gradually during different stages of single S-N extension.The formation of Cenozoic fault systems was mainly controlled by the special boundary geometry,rather than the results of multiple tectonic episodes or reactivation of pre-existing strike-slip faults.更多还原