地震海洋学方法在研究南海东北部海水水体结构中的应用
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摘要
反射地震方法一般用于地下地质结构的探测.本文采用南海东北部的一条地震测线记录,通过对水体反射信号的处理,获取了该测线上海水的声速剖面,并获得了海水水体结构的直观图像.在反射地震剖面上,可以看出南海东北部上层海水结构较为稳定,没有明显的水体侵入痕迹,但中、深层海水中内波较为发育,这与物理海洋学上的研究结果是一致的.本文通过设计合理的数据模型说明了地震海洋学这种方法的可行性,并对地震海洋学的工作方法和方向上提出了一些意见和建议.
Seismic reflection method is usually used to explore the geological structure of underground.In the paper,by processing the data of a high resolution seismic survey line in the northeastern South China Sea,we obtained the subtle velocity structure and clear reflection images of seawater mass in the survey line.From the seismic profile,we can distinguish that the thermohaline structure of upper layer seawater in the northeast South China Sea is relatively steady.There isn't obvious intrusion of other water mass.But in the middle layer seawater, internal waves can be found from the seismic profile.The result accords with the research on physical oceanography in the northern South China Sea.Additionally,a reasonable data model has been designed to prove the feasibility of the seismic oceanography method;some opinions and suggestions are given,which will contribute to future research in seismic oceanography.
Seismic reflection method is usually used to explore the geological structure of underground.In the paper,by processing the data of a high resolution seismic survey line in the northeastern South China Sea,we obtained the subtle velocity structure and clear reflection images of seawater mass in the survey line.From the seismic profile,we can distinguish that the thermohaline structure of upper layer seawater in the northeast South China Sea is relatively steady.There isn't obvious intrusion of other water mass.But in the middle layer seawater, internal waves can be found from the seismic profile.The result accords with the research on physical oceanography in the northern South China Sea.Additionally,a reasonable data model has been designed to prove the feasibility of the seismic oceanography method;some opinions and suggestions are given,which will contribute to future research in seismic oceanography.
引文
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[2] Nandi P,Holbrook W S,Pearse S,et al.Seismic reflection imagine of water mass boundaries in the Norwegian Sea.Geophysical Research Letters,2004,31,L23311,doi:10． 1029/2004GL021325
[3] 宋海斌,董崇志.直达波去除技术在地震海洋学中的应用.中国地球物理年会2007． 青岛:中国海洋大学出版社,2007 Song H B,Dong C Z.Application of technology of removing direct wave in seismic oceanography.The Chinese Geophysics,Qingdao:China Ocean University Press,2007
[4] 董崇志,宋海斌,郝天珧等.南海东北部海洋内波的反射地震研究.地球物理学报,2009,52(8) :2050～2055 Dong C Z,Song H B,Hao T Y,et al.Studying of oceanic internal wave spectra in the Northeast South China Sea from seismic reflections.Chinese J.Geophys.(in Chinese),2009,52(8) :2050～2055
[5] 冯士筰,李凤歧,李少菁.海洋科学导论.北京:高等教育出版社,1999 Feng S Z,Li F Q,Li S J.Introduction to Oceanography(in Chinese).Beijing:Higher Education Press,1999
[6] 刘昭蜀,赵焕庭,范时清等.南海地质.北京:科学出版社,2002 Liu Z S,Zhao H T,Fan S Q,et al.Geology of the South China Sea(in Chinese).Beiiing:Science Press,2002
[7] 杜涛.南海北部的内波.地学前缘,2007,7(增):188 Du T.Internal wave in northern South China Sea.Earth Science Frontiers(in Chinese),2007,7(Suppl.):188
[8] 郑红波,阎贫,王彦林等.研究海水温盐结构的反射地震方法.热带海洋学报,2009,28(1) :48～55 Zheng H B,Yan P,Wang Y L,et al.Ocean thermohaline structure from processing multi channel seismic reflection data of ocean water mass.Journal of Tropical Oceanography(in Chinese),2009,28(1) :48～55
[9] Nakamura Y,Noguchi T,Tsuji T,et al.Simultaneous seismic reflection and physical oceanographic observations of oceanic fine structure in the Kuroshio extension front.Geophysical Research Letters,2006,33,L23605,doi:10． 1029/2006GL027437
[10] 卢博,李赶先,黄韶健等.中国黄海、东海和南海北部海底浅层沉积物声学物理性质之比较.海洋技术,2005,24(2) :28～33 Lu B,Li G X,Huang S J,et al.The Comparing of seabed sediment acoustic-physical properties in the Yellow Sea,the East China Sea and northern the South China Sea.Ocean Technology(in Chinese),2005,24(2) :28～33
[11] Tsuji T,Noguchi T,Niino H,et al.Two-dimensional mapping of fine structures in the Kuroshio Current using seismic reflection data.Geophysical Research Letters,2005,32,L14609,doi:10． 1029/2005GL023095
[12] 郝沪军,林鹤鸣,杨梦雄等.潮汕洼陷中生界-油气勘探的新领域.中国海上油气(地质),2001,15(3) :157～163 Hao H J,Lin H M,Yang M X,et al.The Mesozoic in Chaoshan depression:a new domain of petroleum exploration.China Offshore Oil and Gas(Geology)(in Chinese),2001,15(3) :157～163
[13] Ludwig W J,Kumar N,Houtz R E.Profiler-Sonobuoy measurements in the South China Sea Basin.Geophysical Research,1979,84:3505～3518
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