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南沙地块南薇隆起区的地震反射特征和结构单元划分
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  • 英文篇名:SEISMIC REFLECTION CHARACTERISTICS OF NANWEI UPLIFT ZONE IN NANSHA AND THEIR APPLICATION TO STRUCTURAL UNIT DIVISION
  • 作者:郭磊 ; 詹文欢 ; 尚振华 ; 陈梅 ; 冯英辞
  • 英文作者:GUO Lei;ZHAN Wenhuan;SHANG Zhenhua;CHEN Mei;FENG Yingci;CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Changsha Institute of Mining Research CO.,Ltd.,State Key Laboratory of Metal Mine Safety Technology;
  • 关键词:地震反射 ; 结构单元 ; 南薇隆起 ; 南沙海域 ; 永暑礁
  • 英文关键词:seismic reflection;;structural unit;;Nanwei uplift;;Nansha Waters;;Yongshu Reef
  • 中文刊名:HYDZ
  • 英文刊名:Marine Geology & Quaternary Geology
  • 机构:中国科学院边缘海与大洋地质重点实验室中国科学院南海海洋研究所;中国科学院大学;金属矿山安全技术国家重点实验室长沙矿山研究院有限责任公司;
  • 出版日期:2017-04-28
  • 出版单位:海洋地质与第四纪地质
  • 年:2017
  • 期:v.37;No.166
  • 基金:国家重点基础研究发展计划项目(2013CB956104);; 国家自然科学基金项目(41376063)
  • 语种:中文;
  • 页:HYDZ201702010
  • 页数:9
  • CN:02
  • ISSN:37-1117/P
  • 分类号:103-111
摘要
南薇隆起区地处南沙地块西北部,紧邻西南次海盆,周围发育大量陆缘裂解盆地。裂陷盆地拥有丰富的油气资源。地块经历了中生代末期至古近纪裂谷拉张,并随晚始新世的海底扩张向南漂移至现今位置。结合区域以往地震剖面和钻井数据,分析了2013年中科院南海海洋研究所"实验2号"采集的高分辨率单道地震数据(Nan-1),总结了南薇隆起区的地震反射特征。认为南薇隆起区主要由南部裂陷下沉带和北部埋藏火山隆起带两个结构单元组成。从北到南,埋藏火山隆起带跨越约63km的范围,裂陷下沉带跨越约58km的范围。地震剖面清晰地揭示了该区向海盆侧隆起且在SE向成带的特征。南薇区具有拉张背景,其形成与演化主要是与西南次海盆的扩张作用,以及南沙地块与婆罗洲地块的碰撞作用等有关。自上新世以来,整个南薇隆起区进入构造活动相对稳定阶段,地壳稳定性较好。
        A large number of continental margin rifting basins are well developed on the Nanwei uplift of Nansha Waters,which bears great oil and gas potentials.The region experienced a complex evolutionary history in Cenozoic period,including extensional rifting from Late Mesozoic to Paleogene and seafloor spreading in Late Eocene.A high-resolution single-channel seismic line Nan-1,acquired in the Nansha by the trial vessel " Shiyan 2" of the South China Sea Institute of Oceanology in 2013,is interpreted and analyzed in this study.As well,some previous seismic profiles and drilling data are studied.The seismic reflection characteristics of the Nanwei uplift in the southern margin are summarized and outlined briefly.Results show that the Nanwei uplift zone is mainly composed of two structural units,the southern belt of subsidence and the northern belt of buried volcanic uplift.Compared to the previous reflection seismic data in this area,some main seismic reflection layers are divided.The belt of buried volcanic uplift is about 63 km wide,and the neighboring subsidence belt 58 km wide both in SE direction.The distribution of sporadic epicenters stronger than 4magnitude earthquakes suggest that the entire Nanwei uplift is still a relatively stable tectonic body since Pliocene.
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