基于波动理论的近地表散射噪音衰减
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摘要
基于波动理论,可将地震波场分为入射波场和散射波场。在一定的假设基础上,通过波阻抗差函数可把入射波场和散射波场联系起来。利用波阻抗差函数,可对地震数据中的散射波场进行预测,进而达到去除散射噪声的目的。经正演模型和对实际数据的应用,显示了该方法对衰减近地表散射噪声的优越性。
Based on wave theory,seismic field can be divided into incident wave field and scattered wave field. The incident wave field can be related with the scattered wave field through wave impedance difference function on appropriate assumptions. The scattered wave field in seismic data can be forecasted by using wave impedance difference function so as to reach the intention to eliminate scattered noise. Through the forward modeling and application of field data,this method shows the priority on attenuating near--surface scattered noise.
Based on wave theory,seismic field can be divided into incident wave field and scattered wave field. The incident wave field can be related with the scattered wave field through wave impedance difference function on appropriate assumptions. The scattered wave field in seismic data can be forecasted by using wave impedance difference function so as to reach the intention to eliminate scattered noise. Through the forward modeling and application of field data,this method shows the priority on attenuating near--surface scattered noise.
引文
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[7]杨旭明,周熙襄,王克斌,等.近地表地震散射噪声的正反演方法[J].石油物探,2002,41(3):312-316,320.YANG Xu-ming,ZHOU Xi-xiang,WANG Ke-bin,et al.Forward and inverse method for near surface seismic scat-tered noises[J].Geophysical Prospecting for Petroleum,2002,41(3):312-316,320.
[8]Blonk B,Herman G C.Inverse scattering of surface waves:a new look at surface consistency[J].Geophys-ics,1994,59:963-972.
[9]Blonk B,Herman G C,Drijkoningen G C.An elastody-namic inverse scattering method for removing scattered surface waves from field data[J].Geophysics,1995,60:1897-1905.
[2]Ernst F.减少地震数据上的近地表散射影响[J].石油物探,1999,38(1):59-65.Ernst F.Reduce the influence of scattered wave on seismic record[J].Geophysical Prospecting for Petroleum,1999,38(1):59-65
[3]孙建国.复杂地表条件下地球物理场数值模拟方法评述[J].世界地质,2007,26(3):345-362.SUN Jian-huo.Methods for numerical modeling of geophys-ical fields under complex topographical conditions:a criti-cal review[J].Global Geology,2007,26(3):345-362.
[4]钟伟,杨宝俊,张智.复杂介质地震波场研究进展[J].世界地质,2005,24(4):402,403.ZHONG Wei,YANG Bao-jun,ZHANG Zhi.Advance in research on seismic wavefield of complex medium[J].Global Geology,2005,24(4):402,403.
[5]Aki K.Analysis of the seismic coda of local earthquakes as scattered waves[J].Geophysics,1969,34:615-631.
[6]Wu R S,Aki K.Scattering characteristics of elastic waves by an elastic heterogeneity[J].Geophysics,1985,50:582-595.
[7]杨旭明,周熙襄,王克斌,等.近地表地震散射噪声的正反演方法[J].石油物探,2002,41(3):312-316,320.YANG Xu-ming,ZHOU Xi-xiang,WANG Ke-bin,et al.Forward and inverse method for near surface seismic scat-tered noises[J].Geophysical Prospecting for Petroleum,2002,41(3):312-316,320.
[8]Blonk B,Herman G C.Inverse scattering of surface waves:a new look at surface consistency[J].Geophys-ics,1994,59:963-972.
[9]Blonk B,Herman G C,Drijkoningen G C.An elastody-namic inverse scattering method for removing scattered surface waves from field data[J].Geophysics,1995,60:1897-1905.
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