液体表层层状介质导波频散曲线研究
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摘要
随着地震勘探向浅海、湖泊等流体覆盖层的渗透,存在液体表层或夹层介质中导波的传播研究受到人们重视.在前人研究工作的基础上,本文对存在上覆液体层时的两层、三层以及低速夹层的固体层状介质模型的频散曲线进行了数值计算,分析了当上覆液体表层的厚度变化时多模式导波频散曲线特征.通过与没有液体表层时的完全固体介质模型相对比,研究了存在上覆液体表层时多模式导波频散曲线独特的形态特征,进一步引伸出在滩浅海进行地震勘探中应注意的问题.为在滩浅海及湖泊等表层为液体覆盖层的地区利用导波进行勘探和研究提供一定的研究思路和理论依据.
With seismic exploration extending to liquid-covered areas(such as shallow sea and lakes), much attention is being paid to the propagation of the guided wave in media underlying a liquid layer or with interlayers. Based on previous researches, we calculate the dispersion curves respectively for two-layer, three-layer and a low-speed-inter layer models, which are covered with a liquid layer. We analyze the different characteristics of the multi-made guided wave, for varied thickness of the liquid layer. We compare the geometric characteristics of the multi-mode-dispersion curves to those of that without a liquid surface. And then, we point out some problems which should be taken into consideration when seismic exploration is applied in off-shore areas. The study in this paper may provide some thoughts and theoretical bases for guided wave exploration in liquid-covered areas.
With seismic exploration extending to liquid-covered areas(such as shallow sea and lakes), much attention is being paid to the propagation of the guided wave in media underlying a liquid layer or with interlayers. Based on previous researches, we calculate the dispersion curves respectively for two-layer, three-layer and a low-speed-inter layer models, which are covered with a liquid layer. We analyze the different characteristics of the multi-made guided wave, for varied thickness of the liquid layer. We compare the geometric characteristics of the multi-mode-dispersion curves to those of that without a liquid surface. And then, we point out some problems which should be taken into consideration when seismic exploration is applied in off-shore areas. The study in this paper may provide some thoughts and theoretical bases for guided wave exploration in liquid-covered areas.
引文
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[3]张碧星,兰从庆,喻明等.分层介质中面波的能量分布.声学学报,1998,23(2):97~106Zhang B X,Lang C Q,Yu M,et al.Energy distribution of surface wave instratified media.Acta Acustica(in Chinese),1998,23(2):97~106
[4]张碧星,肖柏勋,杨文杰等.瑞雷波勘探中“之”字型频散曲线的形成机理及反演研究.地球物理学报,2000,43(4):557~567Zhang B X,Xiao B X,Yang WJ,et al.Study onthe mechanismof Zigzag dispersion curves in the Rayleigh wave exploration and inversion problems.Chinese J.Geophys.(in Chinese),2000,43(4):557~567
[5]张碧星,鲁来玉.层状半空间中导波的传播.声学学报,2002,27(4):295~304Zhang B X,Lu L Y.Propagation of guided waves in stratified half space.Acta Acustica(in Chinese),2002,27(4):295~304
[6]张碧星,鲁来玉,鲍光淑.瑞利波勘探中“之”字形频散曲线研究.地球物理学报,2002,45(2):263~274Zhang B X,Lu L Y,Bao GS.Study onthe Zigzag dispersion curves in the Rayleigh wave exploration.Chinese J.Geophys.(in Chinese),2002,45(2):263~274
[7]肖柏勋.高模式瑞雷面波及其正反演研究[博士论文].长沙:中南大学,2000Xiao B X.Study onrayleigh wave of high mode andit’sforward and inversion[Ph.D.thesis](in Chinese).Changsha:Central South University,2000
[8]朱介寿.地震学中的计算方法.北京:地震出版社,1988ZhuJ S.Computing Method in Seismology(in Chinese).Beijing:Seismological Press,1988
[9]陈蔚天,陈晓非.水平层状海洋-地球模型中地震面波振型解.中国科学(D辑),2001,31(9):712~718Chen WT,Chen X F.Model solutions in stratified multi-layered fluid-solid half-space.Science in China(Series D)(in Chinese),2001,31(9):712~718
[10]杨成林.瑞雷波勘探.北京:地质出版社,1993Yang C L.Rayleigh Wave Exploration(in Chinese).Beijing:Geological Publishing House,1993
[11]杜世通主编.弹性波动力学.东营:石油大学出版社,1996Du S T.Elastic Wave Dynamics(in Chinese).Dongying:China University of PetroleumPress,1996
[2]Xia J H,Richard D M,Choon B P.Advantages of calculatingshear-wave velocity from surface waves with higher modes.Expanded Abstracts.70th Ann.Int.Meeting,Soc.Expl.Geophys.,2000.1295~1298
[3]张碧星,兰从庆,喻明等.分层介质中面波的能量分布.声学学报,1998,23(2):97~106Zhang B X,Lang C Q,Yu M,et al.Energy distribution of surface wave instratified media.Acta Acustica(in Chinese),1998,23(2):97~106
[4]张碧星,肖柏勋,杨文杰等.瑞雷波勘探中“之”字型频散曲线的形成机理及反演研究.地球物理学报,2000,43(4):557~567Zhang B X,Xiao B X,Yang WJ,et al.Study onthe mechanismof Zigzag dispersion curves in the Rayleigh wave exploration and inversion problems.Chinese J.Geophys.(in Chinese),2000,43(4):557~567
[5]张碧星,鲁来玉.层状半空间中导波的传播.声学学报,2002,27(4):295~304Zhang B X,Lu L Y.Propagation of guided waves in stratified half space.Acta Acustica(in Chinese),2002,27(4):295~304
[6]张碧星,鲁来玉,鲍光淑.瑞利波勘探中“之”字形频散曲线研究.地球物理学报,2002,45(2):263~274Zhang B X,Lu L Y,Bao GS.Study onthe Zigzag dispersion curves in the Rayleigh wave exploration.Chinese J.Geophys.(in Chinese),2002,45(2):263~274
[7]肖柏勋.高模式瑞雷面波及其正反演研究[博士论文].长沙:中南大学,2000Xiao B X.Study onrayleigh wave of high mode andit’sforward and inversion[Ph.D.thesis](in Chinese).Changsha:Central South University,2000
[8]朱介寿.地震学中的计算方法.北京:地震出版社,1988ZhuJ S.Computing Method in Seismology(in Chinese).Beijing:Seismological Press,1988
[9]陈蔚天,陈晓非.水平层状海洋-地球模型中地震面波振型解.中国科学(D辑),2001,31(9):712~718Chen WT,Chen X F.Model solutions in stratified multi-layered fluid-solid half-space.Science in China(Series D)(in Chinese),2001,31(9):712~718
[10]杨成林.瑞雷波勘探.北京:地质出版社,1993Yang C L.Rayleigh Wave Exploration(in Chinese).Beijing:Geological Publishing House,1993
[11]杜世通主编.弹性波动力学.东营:石油大学出版社,1996Du S T.Elastic Wave Dynamics(in Chinese).Dongying:China University of PetroleumPress,1996
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