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    海洋资料导波压制方法应用

    • 摘要: 海洋资料采集过程中,导波干扰因兼具高能宽频特性,同时继承面波干扰的频散属性,已成为困扰海洋资料处理的核心难题。这类干扰不仅导致空间波场能量分布畸变,更严重破坏信号频谱局部一致性,显著降低资料信噪比。针对该问题,提出一套多层级导波压制方法体系,其核心内容包括:①利用导波频散的特点,引入非线性信号相似性分析(NLSC)方法对导波频散谱进行计算,生成高精度的频散谱;②拾取频散曲线,正演导波模型;③应用非线性自适应最小均方误差(NL-RLS)反褶积滤波器组,将原始数据和导波模型进行自适应匹配相减,显示数据和导波干扰高保真分离与残差抑制。该方法已成功应用于实际地震资料处理,展现出较好的通用性和稳定性,能够非常完美地压制导波干扰,最大限度地保护有效信号,对于海洋资料导波的压制具有极为广泛的应用前景。

       

      Abstract: Guided wave interference in marine data has the characteristics of high energy, wide frequency, and dispersion, just like surface wave interference. Guided wave interference seriously affects the signal-to-noise ratio of data. If it cannot be efficiently removed, it will cause great difficulties for subsequent data processing and interpretation. This article summarizes a process for guided wave suppression. Firstly, by utilizing the characteristics of guided wave dispersion, a high-precision dispersion spectrum is generated, and the picked dispersion curve is used to forward model the guided wave. Then, the guided wave model is subtracted from the original data through adaptive subtraction to achieve the purpose of suppressing guided wave interference. This process can perfectly suppress guided wave interference and maximize the protection of effective signals, making it highly practical.

       

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