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从简化的海洋地震勘探的基本模型出发,根据一次波和多次波的传播所经介质品质因子的不同,通过理论分析和数值实验证明了随着传播时间的增加,一次波的主频可明显低于同一时间段的海水鸣震主频;提出了将多次波的传播时间和相应主频结合起来判别多次波的“时间-频率识别模式”。实际资料的处理实验表明:与传统的“时间识别模式”相比,基于“时间-频率识别模式”的多次波衰减,可在压制多次波的同时较好地保持有效信号的基本特征。
Based on the simplified model of marine seismic prospecting, based on the different media quality factors of primary and multiple waves, theoretical analysis and numerical experiments show that the primary frequency of primary wave can be obviously increased with the increase of propagation time Which is lower than that of the seawater at the same period of time. A new method named “time-frequency identification mode” is proposed to determine the multiples by combining the propagation time of multiple waves with the corresponding dominant frequency. Experiments on actual data show that the multiple attenuation based on “time-frequency identification mode ” can keep effective signals while suppressing multiple waves compared with the traditional “time identification mode” The basic characteristics.