渤海海峡及周边海域浅地层结构及地层声速的拾取

陈晓辉; 张训华; 李铁刚; 李日辉; 王中波

doi:10.3724/SP.J.1140.2012.01069

渤海海峡及周边海域浅地层结构及地层声速的拾取

1 中国科学院海洋研究所, 海洋地质与环境重点实验室, 青岛 266071;
2 国土资源部海洋油气资源与环境地质重点实验室, 青岛海洋地质研究所, 青岛 266071;
3 中国科学院研究生院, 北京 100049

基金项目:

国土资源部海洋区域地质调查项目(GZH200800501)

国家海洋公益性行业科研专项(201005005)

国家自然科学基金项目(41040041)

详细信息

作者简介:
陈晓辉(1981-),男,助理研究员,主要从事海洋地质调查研究工作,E-mal:hongzi1982@163.com

中图分类号: P539.1
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出版历程
- 收稿日期: 2011-06-08
- 修回日期: 2011-09-09

SHALLOW STRATIGRAPHIC SEQUENCES AND THEIR ACOUSTIC VELOCITY IN THE BOHAI STRAIT AND SURROUNDING AREAS

1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Key Laboratory of Marine Hydrocarbon Resource and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071;
3 Graduate School, Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 通过系统分析渤海海峡及周边海域的高分辨率浅地层剖面与3口钻孔的资料,将研究区地层自上而下划分为T₀、T₁、T₂、T₃、T₄、T₅、T₆、T₇、T₈共9个反射界面及SU₁¹、SU₁²、SU₁³、SU₂、SU₃、SU₄¹、SU₄²、SU₄³、SU₅共9个声学地层单元,SU₁地层单元对应全新世海相沉积,其底界为一海进侵蚀面,削蚀对应晚更新世晚玉木冰期陆相沉积的SU₂地层单元。SU₃地层单元对应晚更新世晚玉木间冰期的海相沉积,通过侵蚀间断面与上覆SU₂呈不整合接触。SU₄¹地层单元对应晚更新世早玉木冰期晚期的陆相沉积,SU₄²地层单元对应晚更新世早玉木亚间冰期的海相沉积,与上覆SU₄¹呈侵蚀不整合接触,SU₄³地层单元对应晚更新世早玉木冰期早期的陆相沉积,其顶界面为海进侵蚀面,与下伏地层呈不整合接触,SU₅对应晚更新世玉木-里斯间冰期的海相沉积。对比分析浅地层剖面地层单元与钻孔沉积地层,确定了研究区海底面之下不同地层单元对应的平均声学速度,为后续的地层层序的研究奠定了基础。研究区"海侵-海退-海侵-海退-高水位"的沉积过程,决定了地层平均声速随深度自下而上呈现由高-低-高-低的变化模式。
- 浅地层剖面 /
- 钻孔 /
- 地层结构 /
- 地层声速 /
- 渤海海峡
Abstract: Through the interpretation of high-resolution seismic profiles and three drilling holes collected from the Bohai Strait and its surrounding areas, the subsurface strata of the study area were divided into nine distinct acoustic units (SU₁¹、SU₁²、SU₁³、SU₂、SU₃、SU₄¹、SU₄²、SU₄³、SU₅) from the top downward, defined by nine bounding surfaces (T₀、T₁、T₂、T₃、T₄、T₅、T₆、T₇、T₈). The acoustic unit SU₁ is interpreted as a Holocene marine sediment upon a transgressing erosional surface. The unit SU₂ is a terrestrial sediment underlying the seismic unit SU₁. The acoustic unit SU₃ is a marine sediment formed during the late Wurm Interglacial Stage. The surface between SU₂ and SU₃ is a erosive discontinuity. The acoustic units SU₄¹, SU₄² and SU₄³ correspond to the continental sediment during the late stage of early Wurm Glaciation, marine sediment during the early Wurm Interglaciation and continental sediment during the early stage of early Wurm Glaciation respectively, separated by two distinct erosional surfaces. The unit SU₅ is a marine sediment deposited during the Wurm-Riss Interglacial Stage, bounded by a unconformity on the top. The seismic units are correlated well with the cores in the study area. Average acoustic velocity of the stratigraphic units beneath the sea bottom were calculated as basic data for further study of different stratigraphic sequences. With sea level changes in the study area, the acoustic velocity shows a pattern of high-low-high-low with depth in an ascending order.
- shallow seismic profile /
- drilling hole /
- strata /
- acoustic velocity

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