| 东海陆架盆地中生代残留地层特征及其构造启示 |
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| 引用本文： | 王磊,李春峰,李珂迪,姚泽伟,陶天生.东海陆架盆地中生代残留地层特征及其构造启示[J].海洋学研究,2022,40(4):11-24. |
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| 作者姓名： | 王磊 李春峰 李珂迪 姚泽伟 陶天生 |
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| 作者单位： | 1.浙江大学海洋学院,浙江 舟山 316021; 2.浙江大学海南研究院,海南 三亚 572025; 3.青岛海洋科学与技术国家实验室海洋矿产资源实验室,山东 青岛 266237 |
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| 基金项目： | 国家科技重大专项项目(2016ZX05027-001);国家自然科学基金项目(41906053,41761134051,91858213,41776057);海南省自然科学基金创新研究团队项目(421CXTD441);青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室开放基金项目(MMRKF201809);中国博士后科学基金项目(2018M642409) |
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| 摘 要： | 东海陆架盆地是位于中国东部华南大陆边缘的一个中、新生代叠合盆地,具有较大油气潜力。目前东海陆架盆地油气的发现均来自于新生界,对中生代残留地层的各方面特征认识不足:在空间上通常集中于特定构造单元,且基本位于盆地西部;在时间上主要涉及白垩纪和侏罗纪,且多是定性或半定量的研究。本文在前人研究的基础上,收集、整理了研究区目前最新、最全的反射地震资料和钻井数据,从钻遇中生界井的标定出发,以地震资料的层序划分和解释为基础,进行残留地层的研究,空间上统一盆地东、西两大坳陷带,时间上统揽白垩纪、侏罗纪以及前侏罗纪三个时期。结果表明,东海陆架盆地中生代残留地层遭受了后期严重的剥蚀改造,总体呈现东厚西薄、南厚北薄的特征,残留地层范围随时间不断东扩。对比各时期残留地层平面展布特征,揭示了东海陆架盆地的演变过程:三叠纪时期盆地原型为被动大陆边缘坳陷型盆地,早、中侏罗世时期为活动大陆边缘弧前盆地,晚侏罗世—晚白垩世时期为大陆边缘弧后伸展盆地;与此相对应,古太平洋板块俯冲肇始于晚三叠世—早、中侏罗世时期,板块后撤始于晚侏罗世。东海陆架盆地在中生代的东侧边界位于钓鱼岛隆褶带的东侧。
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| 关 键 词： | 东海陆架盆地 中生界 残留地层 沉积盆地 构造启示 |
| 收稿时间： | 2021-12-30 |
Characteristics and tectonic implications of the Mesozoic residual strata in the East China Sea Shelf Basin |
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| WANG Lei,LI Chunfeng,LI Kedi,YAO Zewei,TAO Tiansheng.Characteristics and tectonic implications of the Mesozoic residual strata in the East China Sea Shelf Basin[J].Journal of Marine Sciences,2022,40(4):11-24. |
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| Authors: | WANG Lei LI Chunfeng LI Kedi YAO Zewei TAO Tiansheng |
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| Affiliation: | 1. Ocean College, Zhejiang University, Zhoushan 316021, China; 2. Hainan Institute, Zhejiang University, Sanya 572025, China; 3. Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China |
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| Abstract: | The East China Sea Shelf Basin is a Mesozoic and Cenozoic superimposed basin with high oil and gas potential. At present, the discovery of oil and gas in the basin comes from the Cenozoic reservoirs, and various aspects of the Mesozoic residual strata are less known. Furthermore, previous qualitative or semi-quantitative studies are usually spatially limited within specific structural units in the western part of the basin and mainly involves Cretaceous and Jurassic. This study collects and sorts out the latest reflection seismic data and well data penetrated into the Mesozoic in the entire study area. Based on seismic sequences of the Cretaceous, Jurassic and Pre-Jurassic, our results show that the Mesozoic residual strata in the East China Sea Shelf Basin suffered from severe denudation in the later period. The Mesozoic residual strata generally thicken to the east and south, and the range of residual strata expanded eastward over time. Comparing the distribution characteristics of the residual strata between different periods, it is further supported that the East China Sea Shelf Basin was a passive continental margin depression basin in the Triassic, and an active continental margin fore-arc basin in the Early-Middle Jurassic, and a continental margin back-arc extensional basin in the late Jurassic to late Cretaceous. Correspondingly, the subduction of the paleo-Pacific plate began in the Late Triassic-Early-Middle Jurassic, and the retreat of the plate began in the Late Jurassic. The east boundary of the Mesozoic proto of the East China Sea Shelf Basin was located on the east side of the Diaoyu Island uplift. |
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| Keywords: | East China Sea Shelf Basin Mesozoic residual strata sedimentary basin tectonic implications |
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