北黄海西部晚第四纪浅层地震剖面层序分析
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摘要
结合前人工作对北黄海西部7条浅层地震剖面测线进行解译,所揭示的晚第四纪U1—U4沉积单元的特征是:U1围绕山东半岛形成楔状沉积体,厚度从近岸地区的大于40m向海减薄到0m;U2平均厚度为15m,分布稳定,在研究区由东北向西南增厚;U3平均厚度为20m左右,西南薄,东北厚;U4只在部分剖面上有记录。测线显示,U2单元层中存在埋藏古河道,大部分被天然气充填,形成两条NE—SW向延伸的分支河道,初步认为其属于古黄河北支水系,位于全新世地层之下的晚更新世地层中,为黄河在晚更新世末期(15~9kaBP)流经北黄海西部的产物。
Based on the information on the stratigraphic units obtained by previous studies, 7 high-resolution seismic lines have been interpreted for the western part of the North Yellow Sea. Four seismic units (U1 to U4) from top to bottom that are formed during late Quaternary are identified: U1, which is distributed around the Shandong Peninsula in a wedge-shape, with a thickness of up to 40 m; U2, which is more stable than U1 with an average thickness of 15 m, being relatively thick in the northeast but thin in the southwest of the study area; U3, which is thicker in the northeast than in the southwest, with a mean thickness of around 20 m; and U4, which is present only in parts of seismic survey lines. Buried paleo-channels are seen in U2 along the profiles, with many being filled with shallow gas; the channels form two branches in NE-SW direction. These paleo-channels are believed to be the northern branches of the Paleo-Yellow River and formed at the end of late Quaternary (15~9 kaBP) when the Paleo-Yellow River flowed into the study area.
Based on the information on the stratigraphic units obtained by previous studies, 7 high-resolution seismic lines have been interpreted for the western part of the North Yellow Sea. Four seismic units (U1 to U4) from top to bottom that are formed during late Quaternary are identified: U1, which is distributed around the Shandong Peninsula in a wedge-shape, with a thickness of up to 40 m; U2, which is more stable than U1 with an average thickness of 15 m, being relatively thick in the northeast but thin in the southwest of the study area; U3, which is thicker in the northeast than in the southwest, with a mean thickness of around 20 m; and U4, which is present only in parts of seismic survey lines. Buried paleo-channels are seen in U2 along the profiles, with many being filled with shallow gas; the channels form two branches in NE-SW direction. These paleo-channels are believed to be the northern branches of the Paleo-Yellow River and formed at the end of late Quaternary (15~9 kaBP) when the Paleo-Yellow River flowed into the study area.
引文
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[2] Jin J H, Chough S K, Ryang W H.Sequence aggradation andsystems tracts partitioning in the mid-eastern Yellow Sea:roles of glacio-eustasy, subsidence and tidal dynamics[J].Ma-rine Geology,2002,184:249—271.
[3] Chough S K, Kim J W, Lee S H, et al. High-resolution a-coustic characteristics of epicontinental sea deposits, central-eastern Yellow Sea [ J]. Marine Geology,2002,188:317—331.
[4] Park S C, Lee H H, Han H S, et al. Evolution of late Qua-ternary mud deposits and recent sediment budget in the south-eastern Yellow Sea [ J]. Marine Geology,2000,17:271—288.
[5] Alexander C R, DeMaster D J, Nittrouer C A. Sediment accu-mulation in a modern epicontinental-shelf setting: The YellowSea[J]. Marine Geology,1991,98:51—72.
[6] Liu Z X, Berne S, Saito Y, et al. Quaternary seismic stratig-raphy and paleoenvironments on the continental shelf of theEast China Sea [ J]. Journal of Asian Earth Sciences,2000,18:441—452.
[7]刘敏厚,吴世迎,王永吉.黄海晚第四纪沉积[M].北京:海洋出版社,1987.[LIU Min-hou, WU Shi-ying, WANG Yong-ji.Late Quaternary Geology of the Yellow Sea[M]. Beijing: Chi-na Ocean Press,1987.]
[8] Liu J P, Milliman J D, Gao S. The Shandong mud wedge andpost-glacial sediment accumulation in the Yellow Sea[J]. Geo-Mar. Lett.,2002,21:212—218.
[9]程鹏,高抒,刘敬圃,等.北黄海西部全新统分布的初步认识[ J].第四纪研究,2001,21(4):37.[CHENG Peng, GAO Shu,LIU Jing-pu, et al. Preliminary analysis of the distribution ofHolocence deposits in the west of the North Yellow Sea [ J].Quaternary Research,2001,21(4):37.]
[10]王桂芝,高抒,李凤业.北黄海西部的全新世泥质沉积[ J]。海洋学报,2003,25(4):125—134.[ WANG Gui-zhi, GAOShu, LI Feng-ye. Holocene mud deposits in the west of thenorthern Huanghai Sea[J]. Acta Oceanologica Sinica,2003,25(4):125—134.]
[11] Liu J P, Milliman J D, Gao S, et al. Holocene developmentof the Yellow River’s subaqueous delta, North Yellow Sea[J]. Marine Geology,2004.209:45—67.
[12]金翔龙,喻普之.北黄海构造轮廓[A].黄东海地质[M].北京:科学出版社,1982.23—29.[JIN Xiang-long, YU Pu-zhi.Structral outline in the northern part of the Yellow Sea[A].The Geology of The Yellow Sea and The East China Sea[M].Beijing: Science Press,1982.23—29.]
[13]程鹏.北黄海细颗粒物质的沉积特征与输运过程[D].中国科学院海洋研究所研究生学位论文.2000.[CHENG Peng.Sediment characteristics and transport processes of fine-grained material over the Northern Yellow Sea[D]. Disserta-tion of Institute of Oceanology, Chinese Academy of Sci-ences.2000.]
[14]李凡,张秀荣,孟广兰,等.晚更新世末期南黄海中部埋藏古三角洲的研究[J].海洋与湖沼,1998,29(1):67-72.[LIFan, ZHANG Xiu-rong, MENG Guang-lan, et al. Buriedpaleo-Huanghe River delta in the central southern Yellow Seaduring the late Pleistocene [ J ]. Oceanologia et LimnologiaSinica,1998,29(1):67-72.]
[15]李凤业,高抒,贾建军,等.黄、渤海泥质沉积区现代沉积速率[J].海洋与湖沼,2002,33(4):364—369.[ LI Feng-ye,GAO Shu, JIA Jian-jun, et al. Contemporary depositionrates of fine-grained sediment in the Bohai and Yellow Seas[J]. Oceanologia et Limnologia Sinica,2002,33(4):364—369.]
[16]李凡,张秀荣,唐宝珏.黄海埋藏古河道及灾害地质图集[M].山东:济南出版社,1998.111.[LI Fan, ZHANG Xiu-rong, TANG Bao-jue. Atlas of Yellow Sea Buried Paleo-channels and Geological Hazards [ M ]. Shandong: JinanPress,1998.111.]
[17]李凡,于建军,姜秀,等.南黄海埋藏古河系研究[ J].海洋与湖沼,1991,22(6):502—508.[ LI Fan, YU Jian-jun,JIANG Xiu, et al. Study on buried paleo-channel system inthe south Yellow Sea[ J]. Oceanologia et Limnologia Sinica,1991,22(6):502—508.]
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