基于小波变换的地震相干体算法研究
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摘要
基于计算相干体算法 ,提出了用模拟地震子波的小波函数 (或高分辨导数小波函数 )的小波变换 ,得到分频瞬时相位 ,再计算相干体的相干体算法 1和用小波变换得到的实、虚部 (相当Hilbert变换 )计算相干体的相干体算法 2 .在油田构造解释中 ,为了突出小断层特征 ,用分频计算出的相干体进行重构 .实际资料计算表明 ,相干体算法 2较K .J.Marfurt相干体算法抗噪声能力强 ;相干体算法 1较相干体算法 2在实际应用中效果更明显 .
Two methods of calculating coherence cube are put forward in frequency division on the basis of wavelet transform, and methods of M. Bahorich and K. J. Marfurt. The first method is for calculating coherence cube by using instantaneous phase of wavelet transform of wavelet functions (or derivative wavelet functions) simulating seismic wavelet; The second method is for calculating coherence cube by using the real and imaginary parts of wavelet transform above-mentioned wavelet functions. In order to identify characteristics of small faults under in oilfield structure, the coherence cube is reconstructed by calculating coherence cube in frequency division. The first method is testified to be more efficient than the second in terms of the application of oilfield.
Two methods of calculating coherence cube are put forward in frequency division on the basis of wavelet transform, and methods of M. Bahorich and K. J. Marfurt. The first method is for calculating coherence cube by using instantaneous phase of wavelet transform of wavelet functions (or derivative wavelet functions) simulating seismic wavelet; The second method is for calculating coherence cube by using the real and imaginary parts of wavelet transform above-mentioned wavelet functions. In order to identify characteristics of small faults under in oilfield structure, the coherence cube is reconstructed by calculating coherence cube in frequency division. The first method is testified to be more efficient than the second in terms of the application of oilfield.
引文
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[2] KurtJMarfurt,RonaldMScheet,JohnA .Sharp,etal.Suppressoftheacquisitionfootprintforseismicsequenceattributemapping.Geophysics,1998,63(3):1024—1035.
[3] KurtJ.Marfurt,R .Lynnkirlin,StevenL .Farmeretal.3Dseismicattributesusingasemblance basedcoherencyalgorithm.Geophysics,1998,63(4):1150—1165.
[4] 刘传虎.地震相干分析技术在裂缝油气藏预测中的应用.石油地球物理勘探,2001,36(2):238—244. LIUChuanHu.Applicationofseismiccoherentanalysistechnologytopredictionoffracturedreservoir.OilGeophysicalProspecting(inChinese),2001,36(2):238—244.
[5] GrossmanA ,KonlandMartinetR ,MorletJ.Readingandunderstandingcontinuouswavelettransform.In:Wavelet,TimeFrequencyMethodsandPhaseSpace1stInt.waveletConf.,Marseille,1989.2—20.
[6] 王西文.高分辨率滤波算子在小波域中的提取.石油地球物理勘探,2000,35(3):298—306,314.WANGXiWen.Obtainingthehigh resolutionfilteroperatorinwaveletdomain.OilGeophysicalProspecting(inChinese),2000,35(3):298—306.
[7] 高静怀,汪文秉,朱光明.地震资料处理中小波函数的选取研究.地球物理学报,1996,39(3):392—399. GAOJingHuai,WANGWenBing,ZHUGuangMing,etal.Onthechoiceofwaveletfunctionsforseismicdataprocessing.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1996,39(3):392—399.
[8] 王西文,高静怀,李幼铭.高分辨地震资料处理中导数小波函数的构造.石油物探,2000,39(2):64—71. WANGXiWen,GAOJingHuai,LIYouMing.Constructionofderivativewaveletfunctioninresolutionseismicdataprocessing.GeophysicalProspectingforPetroleum.(inChinese),2000,39(2):64—71.
[9] 王西文,刘全新,李幼铭等.地震信号瞬时特征在小波域分频提取的方法和应用.石油地球物理勘探,2000,35(4):452—460. WANGXiWen,LIUQuangXin,LIYouMingetal.Onemethodforfrequency divisionobtainmentofinstantaneouscharacteristicsofseismicsignalsinwaveletdomain,anditsapplication.OilGeophysicalProspecting(inChinese),2000,35(4):452—460.
[10] 高静怀,汪文秉,朱光明等.小波变换与信号瞬时特征分析.地球物理学报,1997,40(6):821—832. GAOJingHuai,WANGWenBing,ZHUGuangMing.Instantaneousattributesanalysisviawavelettransform.ChineseJ .Geophys.(ActaGeophysicaSinica),1997,40(6):821—832.
[11] 王西文.小波域地震资料处理方法(WSSP)研究.[博士论文].北京:中国科学院地质与地球物理研究所,2000. WANGXiWen.Researchesonthemethodofseismicdataprocessingfromwavelettransform(WWSP)[Ph.D .dissertation].Beijing:InstituteofGeologyandGeophysics,ChineseAcademyofSciences,2000.
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