| 渤海海峡及周边海域浅地层结构及地层声速的拾取 |
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| 引用本文： | 陈晓辉,张训华,李铁刚,李日辉,王中波.渤海海峡及周边海域浅地层结构及地层声速的拾取[J].海洋地质与第四纪地质,2012(1):69-76. |
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| 作者姓名： | 陈晓辉 张训华 李铁刚 李日辉 王中波 |
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| 作者单位： | 中国科学院海洋研究所海洋地质与环境重点实验室;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;中国科学院研究生院 |
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| 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) |
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| 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。
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| 关 键 词： | 浅地层剖面 钻孔 地层结构 地层声速 渤海海峡 |
SHALLOW STRATIGRAPHIC SEQUENCES AND THEIR ACOUSTIC VELOCITY IN THE BOHAI STRAIT AND SURROUNDING AREAS |
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| CHEN Xiaohui,ZHANG Xunhua,LI Tiegang,LI Rihui,WANG Zhongbo.SHALLOW STRATIGRAPHIC SEQUENCES AND THEIR ACOUSTIC VELOCITY IN THE BOHAI STRAIT AND SURROUNDING AREAS[J].Marine Geology & Quaternary Geology,2012(1):69-76. |
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| Authors: | CHEN Xiaohui ZHANG Xunhua LI Tiegang LI Rihui WANG Zhongbo |
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| Institution: | 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) |
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| 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. |
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| Keywords: | shallow seismic profile drilling hole strata acoustic velocity |
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