| 西沙海槽盆地强限制性中央峡谷水道地震相与内部结构的分段特征 |
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| 引用本文： | 姚悦,周江羽,雷振宇,刘浩冉.西沙海槽盆地强限制性中央峡谷水道地震相与内部结构的分段特征[J].沉积学报,2018,36(4):787-795. |
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| 作者姓名： | 姚悦 周江羽 雷振宇 刘浩冉 |
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| 作者单位： | 1.中国地质大学(北京)能源学院, 北京 100083; |
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| 基金项目： | 国家自然科学基金项目(41372112;41572109)，中国地质调查局重点项目(GZH200800504) |
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| 摘 要： | 西沙海槽盆地中央峡谷深水水道规模大，下切深，弯曲度低，表现出强限制性与东西分段性特征。充分利用研究区二维地震资料，对其地震相特征进行识别与分段性研究，识别出中央峡谷水道体系五种典型地震相类型，分别为底部滞留沉积、浊积砂体沉积、块体流沉积、泥质沉积、滑塌沉积。水道内部充填序列与限制性强度区相关性密切。通过地震相图、沉积相图和古地貌恢复图分析，发现西沙海槽中央峡谷整体呈东西向展布，水道西宽东窄，周边地势西高东低。基于分段特征与构造断裂带的吻合性，以西沙次凹处作为拐点将峡谷分为东西两段，其中西段NWW向展布，限制性弱；东段NEE向展布，限制性强。根据展布、形态、充填等诸多方面因素，总结出了13种分段特征，其限制性与分段性主要受到构造活动、地貌形态与物源供应等的控制。
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| 关 键 词： | 西沙海槽 中央峡谷水道 限制性 地震相 分段性 |
| 收稿时间： | 2017-03-15 |
High Restriction Seismic Facies and Inner Structural Segmentation Features of the Central Canyon Channel Systems in Xisha Trough Basin |
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| YAO Yue,ZHOU JiangYu,LEI ZhenYu,LIU HaoRan.High Restriction Seismic Facies and Inner Structural Segmentation Features of the Central Canyon Channel Systems in Xisha Trough Basin[J].Acta Sedimentologica Sinica,2018,36(4):787-795. |
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| Authors: | YAO Yue ZHOU JiangYu LEI ZhenYu LIU HaoRan |
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| Institution: | 1.Energy School, China University of Geosciences, Beijing 100083, China;2.Key Laboratory of Tectonics & Petroleum Resources of the Ministry of Education, China University of Geosciences, Wuhan 430074, China;3.Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China |
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| Abstract: | The central canyon channel of the Xisha trough basin is in large scale, great depth and low sinuosity, showing great restriction and east-west segmentation. By taking advantage of the two-dimensional seismic data, the seismic facies features identification and its segmentation features are investigated in this paper. From the seismic profile in the research area, five seismic facies types are identified. They are:bottom sands and gravel, turbidite deposits, mass transport complex, muddy sediments, and slumps. The internal filling sequence correlates with the restriction level. According to the paleo-geomorphology map, seismic and sedimentary faces maps, the central canyon of the Xisha trough is distributed in the east and west direction. It is low-lying and wider in west, high and narrow in east. Since segmentation shows good consistency and parallelism to the structural fault zone, a turning point is defined to divide the two sections in the Xisha secondary recession. The western section is strongly restricted while the eastern section is weakly restricted. Totally 13 types of segmentation features are summarized from the aspects of distribution, shape, filling etc. of the channel system. And assume that the restriction and segmentation are mainly controlled by tectonic activity, topography and provenance supply. |
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