基于四阶累积量的同相轴自动拾取方法

A Method of Automatic Events Extraction Based on Fourth-Order Cumulants

针对强随机噪声干扰情况下地震勘探资料中同相轴无法正确拾取的问题,提出了基于四阶累积量的同相轴自动拾取方法。该方法利用四阶累积量进行时间延迟估计,避免了相关高斯噪声的影响;同时在参考道的选择上,以一定的间隔设置多个参考道,减少了同相轴拾取过程中的累积误差。理论模型计算表明:该方法相对于互相关方法,对相关高斯噪声有更强的抑制能力,信噪比达到-5dB。在实际资料应用中,拾取了与同相轴有关的参数:同相轴位置,该参数为地震资料的属性分析和精确定量解释提供了依据。

We present a method for automatic events extraction based on fourth-order cumulant in the case of that events can＇t be identified under the condition of powerful stochastic noise in seismic exploration.This method makes use of fourth-order cumulant to estimate the time delay,and to avoid correlative Gaussian noise.And in the selection of reference trace,the principle of setting multiple reference trace in certain interval reduced the cumulate error of events extraction.The theoretical model computation result shows that this method has more powerful ability to restrain the correlative Gaussian noise than cross-correlation method,the signal-to-noise ratio reaches-5 dB.In the implementation of real data,the parameters related to events such as events position and formation dip had extracted.The parameter provides a basis for attribute analysis and quantitative interpretation of this seismic data.