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| Features and dynamic mechanisms of Cenozoic tectonic migration and its impact on hydrocarbon accumulation in the northern South China Sea |
| 南海北部新生代构造迁移的特征、动力学机制及对油气成藏的影响 |
| Received:December 03, 2013 Revised:September 17, 2014 |
| DOI： |
| Key words:tectonic migration, Cenozoic, hydrocarbon accumulation, northern South China Sea |
| 中文关键词: 构造迁移,新生代,油气成藏,南海北部 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Abstract: |
| The northern continental margin of the South China Sea (SCS) is located within the tectonic system of Southeast Asia, an area with a great deal of tectonic migration due to the regional tectonic movements. In this paper, we comprehensively analyze the available geological and geophysical data of the area in order to demonstrate the typical migration patterns of the Cenozoic tectonics in northern SCS caused by the episodes of the Cenozoic tectonic movement. Furthermore, we wanted to assess the lateral variation characteristics of the strata and the different evolution patterns of the main basins’ features. We primarily focus on: (1) the Cenozoic episodic rifting from north to south in the continental margin of the northern SCS. (2) the rifting and depression time of the main basins progressively become younger as you go from north to south, signifying that the migration of both the tectonics and the sediments within the northern SCS travelled from north to south during the Cenozoic, and (3) the lateral tectonic migration on the direction of EW is not regular in total, but in some local areas there’s the trending of tectonic migration from west to east. Analysis of the tectonic migration features of the northern SCS, in combination with the regional tectonic evolution background, indicates that the observed remote lagging effect, resulted from the India-Eurasia plate collision, is the main dynamic mechanism involved in tectonic migration within the northern SCS. Tectonic migration has significant influence on both the organization of petroleum deposits and on hydrocarbon accumulation within the basins in the northern SCS; comprehensive understanding of this dynamic system is of great reference value in predicting hydrocarbon accumulation and has the potential to have an enormous impact in discovering new deep reservoirs for future oil-gas exploration. |
| 中文摘要: |
| 南海北部大陆边缘位于东南亚复杂的构造系统中，构造迁移是区域构造运动差异性影响的必然结果。本文综合分析南海北部地质、地球物理资料，从新生代构造运动的划分以及主要盆地裂陷演化的差异性等方面论证了南海北部新生代构造呈有规律的迁移，其特征主要表现为①南海北部大陆边缘新生代由北向南呈幕式裂陷；②主要盆地裂陷、坳陷时间从北向南逐渐变晚;③南海北部新生代的构造、沉积在时空演化上具有明显的从北向南呈有规律的构造迁移特征，而整体上在东西方向上不具有构造迁移特征，局部地区表现为从西向东的一些构造迁移特征。结合南海北部构造迁移特征以及区域构造演化背景分析认为印度-欧亚板块碰撞形成的远程滞后效应是南海北部新生代构造迁移的主要动力学机制。构造迁移在南海北部各盆地含油气系统以及油气成藏组合等方面有重要体现，充分认识构造迁移特征对把握南海北部油气成藏规律和指导油气勘探具有重要参考意义。 |
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