基于一次波逆时理论的层间多次波衰减方法
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摘要
针对层间多次波与一次波的动校正速度差异较小,应用基于动校速度差异的常规方法无法将层间多次波彻底去除的难题,本文对基于波动理论的层间多次波预测相减方法进行了研究。通过对地震数据进行一定的前期处理,选定某一地层,并沿该层面进行褶积运算,预测与其相关的所有层间多次波;然后应用传统的最小二乘自适应相减算法,压制层间多次波。模拟数据的测试结果验证了方法的有效性。
The discrimination and attenuation of internal multiples is very important in seismic multiple attenuation.The normal moveout difference between internal multiple and primary is small,so conventional methods based on moveout difference are almost invalid in the internal multiple attenuation.We discuss here predicted internal multiple subtraction based on wave equation methods.After some data pre-processing,we chose a layer,and predict all internal multiples related to the layer.The prediction process is a consistent convolution along the layer.The subtraction method that we used is the traditional least-squares adaptive subtraction method.Synthetic data examples illustrate the feasibility of the method.
The discrimination and attenuation of internal multiples is very important in seismic multiple attenuation.The normal moveout difference between internal multiple and primary is small,so conventional methods based on moveout difference are almost invalid in the internal multiple attenuation.We discuss here predicted internal multiple subtraction based on wave equation methods.After some data pre-processing,we chose a layer,and predict all internal multiples related to the layer.The prediction process is a consistent convolution along the layer.The subtraction method that we used is the traditional least-squares adaptive subtraction method.Synthetic data examples illustrate the feasibility of the method.
引文
[1]Verschuur D J.Seismic Multiple Removal Tech-niques:Past,Present and Future.Houston:EAGEPublications,2006,147～153
[2]Berkhout A J.Seismic Migration,Imaging ofAcoustic Energy by Wave Field Extrapolation,PartA:Theoretical Aspects.Elsevier Scientific Publish-ing Company,Amsterdam-Oxford-New York,1982,188～190
[3]Berkhout A J and Verschuur D J.Estimation of mul-tiple scattering by iterative inversion,Part I:Theo-retical considerations.Geophysics,1997,62(5):1586～1595
[4]Verschuur D J and Berkhout A J.Removal of internalmultiples.58th Ann Internat Mtg,Eur Ass of Geoscand Eng,Expanded Abstracts,1996,B003
[5]Hadidi M T and Verschuur D J.Removal of internalmultiples-Field data examples.59th Ann InternatMtg,Eur Ass of Geosc and Eng,Expanded Ab-stracts,1997,A013
[6]Verschuur D J and Berkhout A J.Removal of internalmultiples with common-focus-point(CFP)approach:Part 2-Application strategies and data examples.Geo-physics,2005,70(3):V61～V72
[7]Jakubowicz H.Wave Equation Prediction and Remov-al of Interbed Multiples.60th Ann Internat Mtg,Eur Ass of Geosc and Eng,Expanded Abstracts,1998,0128
[8]Keydar Sh,Landa E,Gurevich B and Gelchinsky B.Multiple prediction using wavefront characteristics ofprimary reflections.59th Ann Internat Mtg,Eur Assof Geosc and Eng,Expanded Abstracts,1997,A016
[9]Araujo F V,Weglein A B,Carvalho P M and Stolt RH.Inverse scattering series for multiple attenuation:an example with surface and internal multiples.SEGTechnical Program Expanded Abstracts,1994,13:1039～1041
[10]Coates R T and Weglein A B.Internal multiple atten-uation using inverse scattering:Results from prestack1and 2-D acoustic and elastic synthetics.SEG Tech-nical Program Expanded Abstracts,1996,15:1522～1525
[11]Weglein A B,Gasparotto F A,Carvalho P M andStolt R H.An inverse scattering series method forattenuating multiples in seismic reflection data.Geophysics,1997,62(6):1975～1989
[2]Berkhout A J.Seismic Migration,Imaging ofAcoustic Energy by Wave Field Extrapolation,PartA:Theoretical Aspects.Elsevier Scientific Publish-ing Company,Amsterdam-Oxford-New York,1982,188～190
[3]Berkhout A J and Verschuur D J.Estimation of mul-tiple scattering by iterative inversion,Part I:Theo-retical considerations.Geophysics,1997,62(5):1586～1595
[4]Verschuur D J and Berkhout A J.Removal of internalmultiples.58th Ann Internat Mtg,Eur Ass of Geoscand Eng,Expanded Abstracts,1996,B003
[5]Hadidi M T and Verschuur D J.Removal of internalmultiples-Field data examples.59th Ann InternatMtg,Eur Ass of Geosc and Eng,Expanded Ab-stracts,1997,A013
[6]Verschuur D J and Berkhout A J.Removal of internalmultiples with common-focus-point(CFP)approach:Part 2-Application strategies and data examples.Geo-physics,2005,70(3):V61～V72
[7]Jakubowicz H.Wave Equation Prediction and Remov-al of Interbed Multiples.60th Ann Internat Mtg,Eur Ass of Geosc and Eng,Expanded Abstracts,1998,0128
[8]Keydar Sh,Landa E,Gurevich B and Gelchinsky B.Multiple prediction using wavefront characteristics ofprimary reflections.59th Ann Internat Mtg,Eur Assof Geosc and Eng,Expanded Abstracts,1997,A016
[9]Araujo F V,Weglein A B,Carvalho P M and Stolt RH.Inverse scattering series for multiple attenuation:an example with surface and internal multiples.SEGTechnical Program Expanded Abstracts,1994,13:1039～1041
[10]Coates R T and Weglein A B.Internal multiple atten-uation using inverse scattering:Results from prestack1and 2-D acoustic and elastic synthetics.SEG Tech-nical Program Expanded Abstracts,1996,15:1522～1525
[11]Weglein A B,Gasparotto F A,Carvalho P M andStolt R H.An inverse scattering series method forattenuating multiples in seismic reflection data.Geophysics,1997,62(6):1975～1989
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