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渤海湾盆地南堡凹陷新生代断裂系统形成机制 |
周天伟1,2,周建勋1,2,董月霞3,王旭东3,常洪卫1,2
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(1.中国石油大学油气资源与探测国家重点实验室,北京102249 ;2.中国石油勘探开发研究院,北京100083;3.中石油冀东油田勘探开发研究院,河北唐山063004)
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摘要: |
基于南堡凹陷实际地质条件设计了 3组不间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。 |
关键词: 南堡凹陷 新生代 断裂系统 砂箱模拟 伸展构造 |
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基金项目:国家自然科学基金项目(40572112) |
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Formation mechanism of Cenozoic fault system of Nanpu sag in Bohai Bay Basin |
ZHOU Tian-wei1,2,ZHOU Jian-xun1,2,DONG Yue-xia3,WANG Xu-dong3,CHANG Hong-wei1,2
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(1. State Key Laboratory of Petroleum Resources and Exploration in China University of Petroleum,Beijing 102249, China;2. Research Institute of Petroleum Exploration & Development,PetroCkina, Beijing 100083, China ;3. Research Institute of Exploration and Development, Jidong Oilfield,PetroChina, Tangshan 063004, China)
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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 fauit 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. |
Key words: Nanpu sag Cenozoic fault system sandbox simulation extensional structures |