用于深度域地震剖面衰减与频散补偿的反Q滤波方法
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摘要
根据地震波在非弹性介质中的传播规律 ,本文提出了一种在深度域地震剖面进行反Q滤波的新方法 .在深度域的Q滤波算子符合地震波在衰减介质中的传播规律 ,不仅考虑了介质吸收对地震波振幅的影响 ,而且还保证了所造成的波形畸变满足因果规律 ,即地震体波具有某种频散性质 .利用该方法处理了 2条总长度约 6 0km的某浅海地区叠后深度偏移地震剖面 .合成记录剖面的正演和反演计算结果表明 ,在对地震剖面进行深度域反Q滤波之后 ,不仅达到了压缩中、深部目的层子波宽度提高分辨率和信噪比的目的 ,而且保持了原始地震剖面的整体形态和能量分布 .
Based on the laws of inelastic media, this paper gives a forward Q method for compensating attenuation and frequency dispersion used in the seismic profile of depth domain. According to the forward and inverse results of synthesized seismic records, our Q filtrating operator of the depth domain is consistent with the seismic laws in the absorbing media, which not only considers the effect of the media absorbing of the waves, but also fits the deformation laws, namely the frequency dispersion of the body wave. We processed two post stacked profiles about 60km, a neritic area of China. The result shows that after the forward Q filtering of the depth domain, the wide of the wavelet of the middle and deep layers is compressed, the resolution and signal noise ratio are enhanced, and the primary sharp and energy distribution of the profile are retained.
Based on the laws of inelastic media, this paper gives a forward Q method for compensating attenuation and frequency dispersion used in the seismic profile of depth domain. According to the forward and inverse results of synthesized seismic records, our Q filtrating operator of the depth domain is consistent with the seismic laws in the absorbing media, which not only considers the effect of the media absorbing of the waves, but also fits the deformation laws, namely the frequency dispersion of the body wave. We processed two post stacked profiles about 60km, a neritic area of China. The result shows that after the forward Q filtering of the depth domain, the wide of the wavelet of the middle and deep layers is compressed, the resolution and signal noise ratio are enhanced, and the primary sharp and energy distribution of the profile are retained.
引文
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[9] 罗娣华,蒋乐群,秦嘉政等.东川地区深井Q值与频率的关系.地球物理学报,2001,44(增刊):170～178LUODihua,JIANGLequn,QINJiazhengetal.RelationbetweenQvalueandfrequencyinaboreholeobservedattheDongchuanareaofChina.ChineseJ.Geophys,2001,44(Suppl.):170～178
[2] AzimiSA ,KalininAV ,KalininVV ,etal.Impulseandtransientcharacteristicsofmediawithlinearandquadraticabsorptionlaws,Izvestiya.PhysicsoftheSolidEarth,1968,288～293
[3] VarelaCL ,RosaALR ,UlrychTJ.Modelingofattenuationanddispersion.Geophysics,1993,58:1167～1173
[4] 常新伟.衰减与频散的补偿方法.石油地球物理勘探.1996,31:442～447CHANGXinwei.Methodforcompensatingattenuationandfrequencydispersion.OilGeophysicalProspecting(inChinese),1996,31:442～447
[5] SaakcilarR .AnalgorithmforQ filtering,J.Seism.Exploration,1996,5:157～168
[6] AkiK ,RichardsPG .QuantitativeSeismology.PrintedintheUSA ,1980
[7] 田树人.用李氏经验公式估算Q滤波中的Q值.石油地球物理勘探,1990,25:354～361TIANShuren.EstimatethefilteringfactorQusingLi’sexperienceequation.OilGeophysicalProspecting(inChinese),1990,25:354～361
[8] 李庆忠.走向精确勘探的道路———高分辨率地震勘探系统工程剖析.北京:石油工业出版社,1993LIQingzhong,ThePrecisionProspectingWayTheAnalysisofHighResolutionSeismicProspectingSystem(inChinese).Beijing:PetroleumIndustrialPress,1993
[9] 罗娣华,蒋乐群,秦嘉政等.东川地区深井Q值与频率的关系.地球物理学报,2001,44(增刊):170～178LUODihua,JIANGLequn,QINJiazhengetal.RelationbetweenQvalueandfrequencyinaboreholeobservedattheDongchuanareaofChina.ChineseJ.Geophys,2001,44(Suppl.):170～178
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