| SUN Zhen,WANG Zhenfeng,SUN Zhipeng,WANG Zhangwen,ZHANG Wei,HE Lijuan.Structure and kinematic analysis of the deepwater area of the Qiongdongnan Basin through a seismic interpretation and analogue modeling experiments[J].Acta Oceanologica Sinica,2015,34(4):32-40 |
| 琼东南盆地深水区主要构造因素与成盆机制分析-地震解释与物理模拟实验 |
| Structure and kinematic analysis of the deepwater area of the Qiongdongnan Basin through a seismic interpretation and analogue modeling experiments |
| 投稿时间：2014-06-21 修订日期：2014-09-28 |
| DOI：10.1007/s13131-015-0585-z |
| 中文关键词: 张裂结构 盆地发育机制 剖面解释 物理模拟实验 琼东南盆地 |
| 英文关键词:rifting structure basin formation mechanism profile interpretation analogue modeling experiments Qiongdongnan Basin |
| 基金项目: |
| 作者 | 单位 | E-mail | | 孙珍 | 中国科学院南海海洋研究所边缘海地质重点实验室, 广州 510301, 中国 | zhensun@scsio.ac.cn | | 王振峰 | 中海石油有限公司湛江分公司, 湛江, 524057, 中国 | | | 王章稳 | 中海石油有限公司湛江分公司, 湛江, 524057, 中国 | | | 孙志鹏 | 山东省地质测绘院, 济南, 250013, 中国 | | | 张伟 | 中海石油有限公司湛江分公司, 湛江, 524057, 中国 | | | 何丽娟 | 中海石油有限公司湛江分公司, 湛江, 524057, 中国 | |
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| 中文摘要: |
| 琼东南盆地位于南海西北部陆坡区,具有水深向东加大的峡谷状地形特点.西侧与北西走向的印支-红河断裂系以中建断裂分隔,东侧通过西沙海槽与西北次海盆相连.随着深水勘探的快速推进,一系列高精度的地质和地球物理资料不断积累,深水盆地的研究不断揭示新的构造和沉积现象.为了进一步系统总结琼东盆地深水区的结构特点和主要控制因素,我们开展了一系列盆地结构、地球物理特点、构造变形和演化等方面的分析,参考物理模拟实验,探讨了琼东南盆地深水区的构造格局和成盆机制.研究发现,琼东南盆地深水区北界主要受二号断裂的强烈控制,东西两侧构造体系的叠加作用使得琼东南盆地中央坳陷带强烈减薄,而初始构造带走向的分段特点和区域应力场的联合作用,导致盆地东西段凹陷的主要发育时期不同,西侧北东东走向的凹陷强烈断陷期在始新世,而东侧近东西走向的宝岛和北礁凹陷强烈断陷活动期在晚始新-早渐新世,NW向基底和继承性低凸起等局部构造控制了深水区的横向分段.因此区域应力、基底软弱带等一级构造控制了琼东南盆地的南北分带,二级构造控制了盆地的东西分块. |
| 英文摘要: |
| Located at the northwest continental slope of the South China Sea, the Qiongdongnan Basin bears valley-shaped bathymetry deepening toward east. It is separated from the Yinggehai Basin through NW-trending Indo-China- Red River shear zone, and connected with NW subsea basin through the Xisha Trough. Along with the rapid progress of the deepwater exploration, large amounts of high resolution geophysical and geological data were accumulated. Scientific researches about deepwater basins kept revealing brand new tectonic and sedimentary discoveries. In order to summarize the structural features and main controlling factors of the deepwater Qiongdongnan Basin, a series of researches on basin architecture, fault activities, tectonic deformation and evolution were carried out. In reference to analogue modeling experiments, a tectonic situation and a basin formation mechanism were discussed. The researches indicate that: the northern boundary of the Qiongdongnan Basin is strongly controlled by No. 2 fault. The overlapping control of two stress fields from the east and the west made the central depression zone extremely thinned. Combined with the changed stress field, the segmentation of a preexisting weakness zone made the sags in the east experiencing different rifting histories from the west ones. The NE-trending west segment of the Qiongdongnan Basin experienced strong rifting during Eocene, while the roughly EW-trending sags in the east segment show strong rifting during late Eocene and early Oligocene. Local structures such as NW-trending basal fault and inherited uplifts controlled the lateral segmentation. So first order factors such as regional stress field and preexisting weakness zone controlled the basin zonation, while the second order factors determined the segmentation from east to west. |
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