时间域单频干扰波消除方法的改进
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摘要
本文采用在时间域内同频率、不同振幅正弦波和余弦波的组合逼近单频干扰波,然后运用快速频率扫描方法估算单频干扰波,利用振幅计算公式计算正弦波和余弦波的振幅,依据单频干扰波计算公式计算单频干扰波,最后从地震记录中减去单频干扰波实现消除单频干扰波的目的。本方法的最大优点就是仅仅消除干扰波,而并不伤害有效信号,从而使得单频干扰波频率分量附近有效信号的信噪比明显提高。本文方法与常规单频干扰波消除方法相比,去噪效果相当,但运算速度却得到了大幅度提高。通过对理论和实际数据的试算,说明了本方法的有效性和可行性。
The paper uses the composition of sine and cosine waves with same frequency and different amplitudes in time domain to approach single-frequency interference wave;then,uses fast frequency sweeping method to evaluate single-frequency interference wave and amplitude-computed formula to compute the amplitudes of sine and cosine waves;finally,minus single-frequency interference wave from seismic records is carried out to realize the goal eliminating single-frequency interference wave.The maximum advantage of the method is only elimination of interference wave without damaging useful signals,which greatly improves the S/N ratio of useful signals adjacent to frequency components of single-frequency interference wave. In comparison with common method eliminating single-frequency interference wave,the method presented in the paper that the denoise effect is equivalent,hut the operational speed has been greatly increased.It's shown by the tests of theoretical and practical data the method is effect and feasible.
The paper uses the composition of sine and cosine waves with same frequency and different amplitudes in time domain to approach single-frequency interference wave;then,uses fast frequency sweeping method to evaluate single-frequency interference wave and amplitude-computed formula to compute the amplitudes of sine and cosine waves;finally,minus single-frequency interference wave from seismic records is carried out to realize the goal eliminating single-frequency interference wave.The maximum advantage of the method is only elimination of interference wave without damaging useful signals,which greatly improves the S/N ratio of useful signals adjacent to frequency components of single-frequency interference wave. In comparison with common method eliminating single-frequency interference wave,the method presented in the paper that the denoise effect is equivalent,hut the operational speed has been greatly increased.It's shown by the tests of theoretical and practical data the method is effect and feasible.
引文
[1]高少武等．时间域单频干扰波压制．石油地球物理勘探，2001，36(1)：51～55
[2]凌云等．非地表一致性噪声的压制．石油地球物理勘探，1992，27(1)：13～28
[3]李庆忠．走向精确勘探的道路．北京：石油工业出版社，1994
[4]俞寿朋．高分辨率地震勘探．北京：石油工业出版社，1993
[5]A V奥本海姆等著，黄建国等译．离散时间信号处理．北京：科学出版社，1998
[6]Simon Haykin．Adaptive Filter Theory．Third Edition．北京：电子工业出版社，1998
[2]凌云等．非地表一致性噪声的压制．石油地球物理勘探，1992，27(1)：13～28
[3]李庆忠．走向精确勘探的道路．北京：石油工业出版社，1994
[4]俞寿朋．高分辨率地震勘探．北京：石油工业出版社，1993
[5]A V奥本海姆等著，黄建国等译．离散时间信号处理．北京：科学出版社，1998
[6]Simon Haykin．Adaptive Filter Theory．Third Edition．北京：电子工业出版社，1998
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