滑动扫描地震数据的谐波干扰压制
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摘要
滑动扫描是一种日趋成熟且应用广泛的可控震源高效采集技术。然而,滑动扫描采集技术受谐波干扰影响,当勘探目标为弱反射层或薄层时,谐波影响更是不可忽略。本文基于力信号设计谐波预测算子求取相关后记录中的谐波干扰,然后将求得的谐波干扰从被干扰区域中剔除,则可压制相关后滑动扫描记录中的谐波干扰,且对有效信号不产生影响。由于该方法可用于相关后数据,相对于常规采集来说,只需额外记录各震次的震源力信号和扫描启动时间即可。理论模型试算和实际应用的结果均表明,该方法效果良好。
Vibroseis slip sweep,a high efficiency seismic data acquisition method,is widely used nowadays.However,seismic data acquired by this method is always contaminated by harmonic noise.This harmonic contamination cannot be neglectable especially when exploration targets are thin beds with weak reflectivity.This paper introduces a new harmonic noise removal approach.Firstly,we use a filter derived from the vibrator ground force signal to estimate harmonics on correlated data,and then subtract them from the correlated data.The method is very effective without signal degradation.It just needs ground force signal and accurate slip time.Uncorrelated traces are not needed.Both synthetic and field data results show the efficacy of the method.
Vibroseis slip sweep,a high efficiency seismic data acquisition method,is widely used nowadays.However,seismic data acquired by this method is always contaminated by harmonic noise.This harmonic contamination cannot be neglectable especially when exploration targets are thin beds with weak reflectivity.This paper introduces a new harmonic noise removal approach.Firstly,we use a filter derived from the vibrator ground force signal to estimate harmonics on correlated data,and then subtract them from the correlated data.The method is very effective without signal degradation.It just needs ground force signal and accurate slip time.Uncorrelated traces are not needed.Both synthetic and field data results show the efficacy of the method.
引文
[1]Lebedev A V and Beresnev I A.Nonlinear distortion of signals radiated by vibroseis sources.Geophysics,2004,69(4):968～977
[2]Wei Z,Sallas J J,Crowell J M et al.Harmonic distor-tion reduction on vibrators-suppressing the supply pressure ripples.SEG Technical Program Expanded Abstracts,2007,26:51～55
[3]Martin F D and Munoz P A.Deharmonics,a method for harmonic noise removal on vibroseis data.Presen-ted at72nd EAGE Annual Meeting,2010
[4]Meunier J and Bianchi T.Harmonic noise reduction opens the way for array size reduction in vibroseis op-erations.SEG Technical Program Expanded Ab-stracts,2002,21:70～73
[5]Sicking C,Fleure T,Nelan S et al.Slip sweep harmon-ic noise rejection on correlated shot data.SEGTechnicalProgramExpandedAbstracts,2009,28:36～40
[6]Do V C and Bagaini C.On the accuracy of harmonic estimation from weighted-sum ground force.Presented at72nd EAGE Annual Meeting,2010
[7]Tinkle A and Rowse S L.Toward a simplified model of vibrator seismic source performance,preliminary re-sults.SEG Technical Program Expanded Abstracts,2010,29:116～120
[2]Wei Z,Sallas J J,Crowell J M et al.Harmonic distor-tion reduction on vibrators-suppressing the supply pressure ripples.SEG Technical Program Expanded Abstracts,2007,26:51～55
[3]Martin F D and Munoz P A.Deharmonics,a method for harmonic noise removal on vibroseis data.Presen-ted at72nd EAGE Annual Meeting,2010
[4]Meunier J and Bianchi T.Harmonic noise reduction opens the way for array size reduction in vibroseis op-erations.SEG Technical Program Expanded Ab-stracts,2002,21:70～73
[5]Sicking C,Fleure T,Nelan S et al.Slip sweep harmon-ic noise rejection on correlated shot data.SEGTechnicalProgramExpandedAbstracts,2009,28:36～40
[6]Do V C and Bagaini C.On the accuracy of harmonic estimation from weighted-sum ground force.Presented at72nd EAGE Annual Meeting,2010
[7]Tinkle A and Rowse S L.Toward a simplified model of vibrator seismic source performance,preliminary re-sults.SEG Technical Program Expanded Abstracts,2010,29:116～120
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