利用地震波组特征的精细相干扫描方法
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摘要
为提高常规倾角扫描相干方法压制噪声的精度,本文提出了一种利用地震波组特征的精细化倾角相干扫描方法,它将倾角扫描与地震波形特征相结合,扫描时使用可变的时窗长度,对各个波组进行相干扫描,采用加权平均的方法实现有效信号拾取,只需将求出的波组的波峰所对应的倾角方向作为整个波形的方向,从而改善了常规倾角扫描相干方法运算量大的问题。理论模型和实际资料处理结果表明,该方法可以有效地消除随机噪声,是复杂地区低信噪比地震数据处理中行之有效的方法。
In order to improve the noise-suppressed precision by conventional dip-scanning coherence algorithm,the paper presented a fine dip-scanning coherence algorithm by seismic wave group feature that combines dip scanning with seismic wave group feature,which carried out coherent scanning of each wave group by using variable window length in scanning,using weighted mean method to realize effective signal pickup and taking the dip direction relative to the peak of wave group as the direction of the whole wave group to improve the issue of large computational effort in conventional dip-scanning coherence algorithm. The theoretical model and practical data processing showed that the method is able to effectively eliminate random noise and is an effective method of seismic data processing with low S/N ratio in complex area.
In order to improve the noise-suppressed precision by conventional dip-scanning coherence algorithm,the paper presented a fine dip-scanning coherence algorithm by seismic wave group feature that combines dip scanning with seismic wave group feature,which carried out coherent scanning of each wave group by using variable window length in scanning,using weighted mean method to realize effective signal pickup and taking the dip direction relative to the peak of wave group as the direction of the whole wave group to improve the issue of large computational effort in conventional dip-scanning coherence algorithm. The theoretical model and practical data processing showed that the method is able to effectively eliminate random noise and is an effective method of seismic data processing with low S/N ratio in complex area.
引文
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[2]Li Qing,Kris Vasudevan,and Frederick A.3-D co-herency filtering.Geophysics,1997,62(4):1310~1314
[3]苑益军,牛滨华等.去噪技术在地震资料处理中的应用.东华理工学院学报,2005,28(1):12~16
[4]李文,冯和平.变倾角扫描提取有效信号技术及应用.勘探地球物理进展,2002,25(2):11~13
[5]Bahorich MS and Famer S L.3-D Seismic discontinui-ty for faults and stratigraphic features:The coherence cube.The Leading Edge,1995,14(10):1053~1058
[6]Kurt J Marfurt.3-D seismic attributes using a semblance-based coherency algorithm.Geophysics,1998,63(4):1150~1165
[2]Li Qing,Kris Vasudevan,and Frederick A.3-D co-herency filtering.Geophysics,1997,62(4):1310~1314
[3]苑益军,牛滨华等.去噪技术在地震资料处理中的应用.东华理工学院学报,2005,28(1):12~16
[4]李文,冯和平.变倾角扫描提取有效信号技术及应用.勘探地球物理进展,2002,25(2):11~13
[5]Bahorich MS and Famer S L.3-D Seismic discontinui-ty for faults and stratigraphic features:The coherence cube.The Leading Edge,1995,14(10):1053~1058
[6]Kurt J Marfurt.3-D seismic attributes using a semblance-based coherency algorithm.Geophysics,1998,63(4):1150~1165
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