径向道变换压制线性干扰改进方法及应用
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摘要
径向道变换(RTT)是一个简单地震道的映射,即将地震道集振幅值从偏移距—双程旅行时(X-T)域变换到视速度—双程旅行时(R-T)域,在R-T域中线性干扰(如面波、直达波等)的频率会得到较大程度的降低从而可将其分离出来。在径向道变换过程中其基本运算为插值,为减小插值误差对线性干扰的影响,通过改进模拟-相减法,即在R-T域分离出噪音后再将原始资料和分离出的噪音反变换回X-T域,最后相减保幅即得去噪结果。通过理论模型和实际资料试验表明这种方法同传统模拟-相减法相比,能够降低插值误差对线性干扰的影响,使线性干扰得到有效压制,提高地震资料的信噪比。
The radial trace transformation(RTT)is the simple mapping operation that moves seismic wavefield amplitudes from the conventional coordinates of offset and traveltime(X-T)to those of apparent velocity and traveltime(R-T).In the R-T domain,the frequency of the linear noise(surface wave,direct wave)can be decreased significantly,so the linear noise in the seismic data can be separated by the radial trace transformation.The basic arithmetic in the radial trace transformation is interpolation.By improving the model-subtract method to reduce the interpolation error of linear interference.After the wavefield separation in the R-T domain,the original data and the separated noise inverse transformation to the X-T domain,and finally the denoising result can be achieved through the subtraction and amplitude preservation.Model data and real data processing demonstrate that this method compared with the traditional model-subtract method,which can reduce the interpolation error of the linear noise and the linear noise can be suppressed and improve the S/N(signal to noise ratio)of seismic data.
The radial trace transformation(RTT)is the simple mapping operation that moves seismic wavefield amplitudes from the conventional coordinates of offset and traveltime(X-T)to those of apparent velocity and traveltime(R-T).In the R-T domain,the frequency of the linear noise(surface wave,direct wave)can be decreased significantly,so the linear noise in the seismic data can be separated by the radial trace transformation.The basic arithmetic in the radial trace transformation is interpolation.By improving the model-subtract method to reduce the interpolation error of linear interference.After the wavefield separation in the R-T domain,the original data and the separated noise inverse transformation to the X-T domain,and finally the denoising result can be achieved through the subtraction and amplitude preservation.Model data and real data processing demonstrate that this method compared with the traditional model-subtract method,which can reduce the interpolation error of the linear noise and the linear noise can be suppressed and improve the S/N(signal to noise ratio)of seismic data.
引文
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[2]周星合,乔琳.地震勘探中的常见地震干扰波及压制方法[J].西部探矿工程,2008,20(11):138~141.
[3]Claerbout J F.Slant-stacks and radial traces[R].Stanford Exploration Project Report,1975,5:1~12.
[4]Ottolini R.Downward continuation of common midpoint gathers by transformation into snell trace coordinates[R].Stanford Exploration Project Report,1979,26:83~94.
[5]夏洪瑞.径向道变换技术在去噪处理中的改进与发展[J].天然气工业,2007,27(增刊A):181~182.
[6]夏洪瑞,唐勇.径向道技术在消除相干噪声中的应用[J].勘探地球物理进展,2007,30(6):448~454.
[7]Henley D C.The radial trace transform:An effective domain for coherent noise attenuation and wavefield separation[J].Expanded Abstracts of 69th Annual Internat SEG Mtg,1999,1204~1207.
[8]Henley D C.Coherent noise attenuation in the radial trace domain[J].Geophysics,2003,68(4):1408~1416.
[9]Henley D C.Coherent noise attenuation in the radial trace domain:introduction and demonstration[J].CREWES Research Report,1999,11:455~491.
[10]刘志鹏,陈小宏,李景叶.径向道变换压制相干噪声方法研究[J].地球物理学进展,2008,23(4):1199~1204.
[11]Brown M,Claerbout J.A pseudo-unitary implementation of the radial transform[J].Expanded Abstracts of 70th Annual International SEG Meeting,2000,2115~2118.
[12]余波,黄中玉,谈大龙,等.径向道滤波法去线性干扰[J].石油物探,2005,44(2):109~112.
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