含AVO效应的转换波速度分析方法
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摘要
当转换波地震记录存在振幅值随炮检距变化,尤其是极性发生反转时,传统转换波速度分析计算结果不准确。为此,按照PP波AB相似系数速度分析方法,解决PP波AVO效应的思路,对存在AVO现象的转换波资料进行AB相似系数方法的拓展,推导出用于解决转换波含有AVO现象的AB相似系数方法,为提高转换波速度分析精度提供了理论支撑。
Conventional velocity analysis results of converted wave are inaccurate when amplitude change with offset existing in converted wave seismic record,especially polarity reversed.Therefor,based on the consideration of AB similar coefficient velocity analysis of PP wave to resolve the AVO effection,the authors extend converted wave data with AVO phenomenon by AB similar coefficient method,and derive AB similar coefficient method to settle the converted wave with AVO phenomenon,which provide theoretical support to improve the accuracy in converted wave velocity analysis.
Conventional velocity analysis results of converted wave are inaccurate when amplitude change with offset existing in converted wave seismic record,especially polarity reversed.Therefor,based on the consideration of AB similar coefficient velocity analysis of PP wave to resolve the AVO effection,the authors extend converted wave data with AVO phenomenon by AB similar coefficient method,and derive AB similar coefficient method to settle the converted wave with AVO phenomenon,which provide theoretical support to improve the accuracy in converted wave velocity analysis.
引文
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[11]Ramos A C B,Castagna J P.Useful approximations forconverted-wave AVO[J].Geophysics,2001,66(5):1271-1734.
[2]徐善辉,韩立国,李培培,等.层状介质P波非双曲走时速度误差分析[J].世界地质,2009,28(1):98-102.XU Shan-hui,HAN Li-guo,LI Pei-pei,et al.Erroranalysis of P-wave non-hyperbolic moveout velocity inlayered media[J].Global Geology,2009,28(1):98-102.
[3]倪冬梅,韩立国,宁媛丽,等.双谱速度分析下的地层压力预测[J].世界地质,2011,30(4):648-654.NI Dong-mei,HAN Li-guo,NING Yuan-li,et al.For-mation pressure prediction by analysis on bi-spectrum ve-locity[J].Global Geology,2011,30(4):648-654.
[4]Taner M T,Koehler F.Velocity spectra-digital computerderivation and applications of velocity functions[J].Geophysics,1969,34(6):859-881.
[5]Sarkar D,Castagna J P,Lamb W.AVO and velocity a-nalysis[J].Geophysics,2001,66(4):1284-1293.
[6]Sarkar D,Baumel R T,Larner K L.Velocity analysis inthe presence of amplitude variation[J].Geophysics,2002,67(5):1664-1672.
[7]Fomel S.Velocity analysis using AB semblance[J].Geophysical Prospecting,2009,57(3):311-321.
[8]张营,冯晅,刘财,等.转换点位置对转换波速度分析精度的影响[J].吉林大学学报:地球科学版,2010,40(增刊):30-34.ZHANG Ying,FENG Xuan,LIU Cai,et al.The influ-ence of the convertion plot position on convert wave veloc-ity analysis accuracy[J].Journal of Jilin University:Earth Science Edition,2010(Suppl.),40:30-34.
[9]王立明,李庆春.选择相关法提高转换波速度分析精度[J].地球物理学进展,2006,21(4):1213-1220.WANG Li-ming,LI Qing-chun.Improving the accuracyof converted-wave velocity analysis with selected-correla-tion method[J].Progress in Geophysics,2006,21(4):1213-1220.
[10]苑春方,彭苏萍,杨良梁.水平界面上P-SV转换波转换点的精确解[J].地球物理学报,2005,48(5):1179-1184.YUAN Chun-fang,PENG Su-ping,YANG Liang-liang,et al.An exact solution of the coordinate equation of theconversion point for P-SV converted waves at a horizontalreflector[J].Chinese Journal of Geophysics,2005,48(5):1179-1184.
[11]Ramos A C B,Castagna J P.Useful approximations forconverted-wave AVO[J].Geophysics,2001,66(5):1271-1734.
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