地质条件复杂地区瑞雷波勘探正演模拟
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摘要
为研究复杂地质条件对瑞雷面波频散曲线的影响,采用有限差分地震数值模拟方法,对3种模型进行正演模拟,得出了某一时刻的波场快照与单炮记录。对模拟记录进行频散分析的结果表明:单层均匀介质没有频散现象;起伏地表两层均匀介质的频散曲线相速度只和介质本身的参数有关,不受地形的影响;水平地表含软夹层介质中,瑞雷波频散现象非常明显。
In order to study the influence of complicated geological conditions on frequency dispersion curves of Rayleigh surface wave,the paper,using finite difference seismic numeric modeling,carried out forward modeling on three models,obtained wave field snapshot and single shot record at certain time.Analysis of frequency dispersion of modeled record showed that there was no frequency dispersion in single layer homogeneous medium,phase velocity of frequency dispersion curves in double layer homogeneous media on relief surface was only related to the para-meters of media themselves,and was not influenced by topography,in media with interbedded soft layer in flat surface,frequency dispersion of Rayleigh wave was very evident.
In order to study the influence of complicated geological conditions on frequency dispersion curves of Rayleigh surface wave,the paper,using finite difference seismic numeric modeling,carried out forward modeling on three models,obtained wave field snapshot and single shot record at certain time.Analysis of frequency dispersion of modeled record showed that there was no frequency dispersion in single layer homogeneous medium,phase velocity of frequency dispersion curves in double layer homogeneous media on relief surface was only related to the para-meters of media themselves,and was not influenced by topography,in media with interbedded soft layer in flat surface,frequency dispersion of Rayleigh wave was very evident.
引文
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[6]周竹生,刘喜亮,熊孝雨.弹性介质中瑞雷面波有限差分法正演模拟[J].地球物理学报,2007,50(2):567-573.
[7]唐圣松.二维起伏地表模型瑞雷波场正演研究[D].长沙:中南大学信息物理工程学院,2009.
[8]邵秀民,蓝志凌.非均匀各向同性弹性介质中地震波传播的数值模拟[J].地球物理学报,1995,38(增刊1):39-55.
[9]张中杰,何樵登.三维横向各向同性介质中人为边界反射吸收[J].地球物理学报,1993,28(4):36-40.
[10]董良国.弹性波数值模拟中的吸收边界条件[J].石油地球物理勘探,1999,34(1):45-56.
[11]牟永光,裴正林.三维复杂介质地震数值模拟[M],北京:石油工业出版社,2005.
[12]张中杰,何樵登,三维横向各向同性介质中人为边界反射吸收[J].地球物理学报,1993,28(4):36-40.
[2]SCHWAB F.Surface_wave dispersion computation:Knopoff’s method[J].Bull.Seism.Soc.Am.,1970,60(5):1491-1520.
[3]WASTON H T.A note on fast computation of Rayleigh wave dispersion in multilayered half_space[J].Bull.Seism.Soc.Am.,1970,60(1):161-166.
[4]KENNETT B L N.Reflections rays and reverberations[J].Bull.Seism.Soc.Am.,1974,64:1685-1696.
[5]熊章强.复杂介质中瑞雷面波的正演模拟及传播特征研究[D].武汉:中国地质大学地球物理与空间信息学院,2006.
[6]周竹生,刘喜亮,熊孝雨.弹性介质中瑞雷面波有限差分法正演模拟[J].地球物理学报,2007,50(2):567-573.
[7]唐圣松.二维起伏地表模型瑞雷波场正演研究[D].长沙:中南大学信息物理工程学院,2009.
[8]邵秀民,蓝志凌.非均匀各向同性弹性介质中地震波传播的数值模拟[J].地球物理学报,1995,38(增刊1):39-55.
[9]张中杰,何樵登.三维横向各向同性介质中人为边界反射吸收[J].地球物理学报,1993,28(4):36-40.
[10]董良国.弹性波数值模拟中的吸收边界条件[J].石油地球物理勘探,1999,34(1):45-56.
[11]牟永光,裴正林.三维复杂介质地震数值模拟[M],北京:石油工业出版社,2005.
[12]张中杰,何樵登,三维横向各向同性介质中人为边界反射吸收[J].地球物理学报,1993,28(4):36-40.
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