基于改进的广义S变换的地层吸收衰减补偿
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
广义S变换采用时窗宽度随频率呈反比例变化的高斯窗函数,而改进的广义S变换采用宽度可变的高斯窗函数,其时窗宽度随频率呈正比例变化,即在低频段时窗较窄,获得较高的时间分辨率;高频段时窗较宽,获得很高的频率分辨率。此法更有利于进行地震波吸收衰减补偿。该方法能进行无损的广义S反变换,并能提取时变Q值,避免了传统方法中利用Q值补偿造成的欠补偿或过补偿问题。补偿后各时刻的时频谱变化趋势完全相同,地震记录的频带相同。此法用于实际VSP数据处理,结果表明利用该法进行吸收衰减补偿效果明显,有利于提高地震资料的分辨率,改善资料的品质。
The Gauss function whose window width changes in inverse proportion with frequency was used in generalized S-transform,while for improved generalized S-transform the variable width window was used,the window's width change with frequency was proportional.That is,the window is narrower for low frequency with the high time resolution,while the window is wider for high frequency with the high frequency resolution.With the new method the lossless generalized S-inverse transform can be conducted and time-dependent Q value can be estimated,so the under-compensation and over compensation which developed in traditional Q compensation method were avoided.After compensation,the variation trend of the time&frequency spectrum are exactly the same at every moment,and the seismic frequency bands are the same.Application of the new method in the field VSP data shows that the new method works very well for absorption and attenuation compensation,it also raises resolution and improves data quality.
引文
[1]凌云,高军,吴琳.时频空间域球面发散与吸收补偿.石油地球物理勘探,2005,40(2):176~182,189
    [2]高军,凌云,周兴元,牟永光.时频域球面发散和吸收补偿.石油地球物理勘探,1996,31(6):856~866,905
    [3]Stockwell R G,Mansinha L,Lowe R P.Localization of the complex spectrum:the Stransform.IEEE Trans-actions on Signal Processing,1996,44(4):998~1001
    [4]高静怀,陈文超,李幼铭等.广义S变换与薄互层地震响应分析.地球物理学报,2003,46(4):526~532
    [5]高静怀,汪文秉,朱光明等.地震资料处理中小波函数的选取研究.地球物理学报,199639(3):392~399
    [6]熊晓军,贺振华,黄德济,陈学华.广义S变换在地震高分辨处理中的应用.勘探地球物理进展,2006,29(6):415~418
    [7]朱光明.垂直地震剖面法.北京:石油工业出版社,1988
    [8]白桦,李鲲鹏.基于时频分析的地层吸收补偿.石油地球物理勘探,1999,34(6):642~680
    [9]刘喜武,年静波,刘洪.基于广义S变换的吸收衰减补偿方法.石油物探,2006,45(1):9~14

版权所有:© 2021 中国地质图书馆 中国地质调查局地学文献中心