基于频率差异的多次波识别

Multiple Identification Based upon Frequency Differences

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 upon a simplified marine seismic model with different medium quality factors along the different wave trajectories,this paper theoretically and numerically proves that,as the travel time increasing,the dominant frequency of primary wave will be much lower than that of reverberation within a same travel time window.The paper presents a new approach,the Time-Frequency Identification Mode,in which a wave is recognized to be a multiple not only by the travel time but also the dominant frequency of the signal.Real seismic data processing examples demonstrate that comparing to the traditional Time Identification Mode,using the Time-Frequency Identification Mode can suppress the multiple effectively and meanwhile protect the basic characteristics of the primary wave.