拟线性空间变换叠前F—X地震去噪新方法
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摘要
针对地下构造复杂、叠前记录信噪比较低的问题,提出一种利用叠加剖面信息的叠前去噪新方法。该方法首先利用正交多项式逼近技术,采用最大相似系数准则,在叠加剖面上计算出描述地震同相轴走向的有关参数。利用这些参数对动校正后的单炮地震记录作拟线性化变换。对变换后地震单炮数据进行F—X域有效信号预测。最后,对得到的预测结果进行拟线性化变换,即得到去噪后单炮记录。实际资料试算结果表明:方法能适应复杂构造;具有较好的去随机干扰能力;保真性较好。
Facing the problem of complex subsurface structure and low s/n ratio of prestack record, this paper proposes a new method of noise removal using stacked cross section information. This method first uses orthogonal multinomial approximation technique and observes maximum similarity coefficient principle to calculate relative parameters for describing seismic event trend on stacked cross sections. It uses these parameters to finish pseudo-linear transform of single shot seismic record after dynamic correction, and predicts effective signals in F-X field for the seismic single shot data after transform. Finally, it performs pseudo-linear transform of the predicted result, i.e., obtains the single shot record after noise removal. The result of actual data calculation shows that this method can adapt complex structure and has high random disturbance removal capability and fidelity.
Facing the problem of complex subsurface structure and low s/n ratio of prestack record, this paper proposes a new method of noise removal using stacked cross section information. This method first uses orthogonal multinomial approximation technique and observes maximum similarity coefficient principle to calculate relative parameters for describing seismic event trend on stacked cross sections. It uses these parameters to finish pseudo-linear transform of single shot seismic record after dynamic correction, and predicts effective signals in F-X field for the seismic single shot data after transform. Finally, it performs pseudo-linear transform of the predicted result, i.e., obtains the single shot record after noise removal. The result of actual data calculation shows that this method can adapt complex structure and has high random disturbance removal capability and fidelity.
引文
[1]NecatiGulunay.Fxdeconandcomplexwienerpredicationfilter,Pres entedatthe56thAnnualSEGmeeting,1986.
[2]国九英.叠前ω—x域算子外推法去噪[J].石油地球物理勘探,1995,30(4):487494.
[3]陈湛文,刘勇.基于空间变换的F—X地震去噪新方法[J].大庆石油地质与开发,2002,21(3).
[2]国九英.叠前ω—x域算子外推法去噪[J].石油地球物理勘探,1995,30(4):487494.
[3]陈湛文,刘勇.基于空间变换的F—X地震去噪新方法[J].大庆石油地质与开发,2002,21(3).
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