基于小波域从叠前地震数据提取地层品质因子Q
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摘要
结合小波理论,利用地震波在黏弹性介质中的吸收衰减传播规律,在小波域以修正的复Morlet小波为基本小波,实现了从叠前炮集和共中心点道集地震数据,提取等效地层品质因子,然后通过剥层法估算层品质因子。文中采用地面地震正演记录和实际海上地震资料试算,验证了本文提出的方法的正确性.结果表明,方法正确可行,可靠有效,最后提出改善效果的措施和实际应用中应注意的问题。
This paper uses an energy attenuation formula of seismic waves in the wavelet scale domain from the wavelet theory and seismic wave propagation equation in an elastic medium.And subsequently a formula is obtained through which can calculate the factor in the wavelet domain.Using the amended complex Morlet wavelet as analyzing wavelets,a new method for estimating Q-factors from CMP gathers and shot gathers in the wavelet domain is adopted to estimates the Q-factors with layer-stripping approach.By synthetic seismic record and real sea seismic data,we estimate the Q which are nearly the same as model parameter and proved the method we adopted is correct.Desired results have been achieved.The final recommendations on improvement measures and the practical application of results should be attention.
This paper uses an energy attenuation formula of seismic waves in the wavelet scale domain from the wavelet theory and seismic wave propagation equation in an elastic medium.And subsequently a formula is obtained through which can calculate the factor in the wavelet domain.Using the amended complex Morlet wavelet as analyzing wavelets,a new method for estimating Q-factors from CMP gathers and shot gathers in the wavelet domain is adopted to estimates the Q-factors with layer-stripping approach.By synthetic seismic record and real sea seismic data,we estimate the Q which are nearly the same as model parameter and proved the method we adopted is correct.Desired results have been achieved.The final recommendations on improvement measures and the practical application of results should be attention.
引文
[1]Sheriff R E,Geldart L P.Exploration Seismology(Second Edition)[M].New York:Cambridge Uni-versity Press,1995.
[2]Hauge P S.Measurements of attenuation from verti-cal seismic profiles[J].Geophysics,1981,46(11):1548~1558.
[3]Stains by S D,Worthington MH.Qestimation fromvertical seismic profile data and anomalous variations inthe North Sea[J].Geophysics,1985,50(4):615~626.
[4]Ricker N.The form and nature of seismic waves andthe structure of seismogram[J].Geophysics,1940,5(4):348~366.
[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[J].地球物理学报,1996,39(3):389~397.
[6]李宏兵,赵文智,曹宏,等.小波尺度域含气储层地震波衰减特征[J].地球物理学报,2004,47(5):892~898.
[7]高静怀,杨森林.利用零偏移VSP资料估计介质品质因子方法研究[J].地球物理学报,2007,50(4):1198~1209.
[8]陈爱萍,邹文,刘天佑.共中心点道集中品质因子的估计及应用[J].勘探地球物理进展,2004,27(1):32~44.
[9]赵伟,葛艳.利用零偏移距VSP资料在小波域计算介质Q值[J].地球物理学报,2008,51(4):1202~1208.
[2]Hauge P S.Measurements of attenuation from verti-cal seismic profiles[J].Geophysics,1981,46(11):1548~1558.
[3]Stains by S D,Worthington MH.Qestimation fromvertical seismic profile data and anomalous variations inthe North Sea[J].Geophysics,1985,50(4):615~626.
[4]Ricker N.The form and nature of seismic waves andthe structure of seismogram[J].Geophysics,1940,5(4):348~366.
[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[J].地球物理学报,1996,39(3):389~397.
[6]李宏兵,赵文智,曹宏,等.小波尺度域含气储层地震波衰减特征[J].地球物理学报,2004,47(5):892~898.
[7]高静怀,杨森林.利用零偏移VSP资料估计介质品质因子方法研究[J].地球物理学报,2007,50(4):1198~1209.
[8]陈爱萍,邹文,刘天佑.共中心点道集中品质因子的估计及应用[J].勘探地球物理进展,2004,27(1):32~44.
[9]赵伟,葛艳.利用零偏移距VSP资料在小波域计算介质Q值[J].地球物理学报,2008,51(4):1202~1208.
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