The wave field separation method in comparison with other methods in prestack reverse-time migration denoising
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摘要: 基于双程波动方程的逆时偏移( RTM)具有原理简单、无倾角限制、具有可以适用于速度任意变化的模型,对各类波正确成像等优点,但采用互相关成像条件会产生严重的低频噪声问题。笔者分析低频噪声的产生机制后提供了一个有效的波场分离去噪方法,将震源和检波点波场分离成不同方向的单成波分量,只对有效路径上的分量进行互相关成像,从而达到去除噪声的目的。并通过模型测试对比了坡印廷矢量滤波、拉普拉斯滤波、波场分离滤波这三种方法的去噪效果,结果表明基于波场分离的去噪方法效果更好。Abstract: Two?way wave equation based on reverse time migration ( RTM) has such advantages as simple principle,no angle restric?tions,suitability for the model of arbitrary speed changes,and correct imaging for all kinds of waves.Nevertheless,the adoption of the cross?correlation imaging condition can produce low?frequency noise problems.Based on analyzing the mechanism of the low frequency noise,the authors put forward an effective wave field separation denoising method,in which the source and the receiver wave field are separated into different directions of one way wave component,and only cross?correlation imaging is conducted on the effective path of the component,so as to achieve the purpose of removing noise. The results of the model test and comparative study of the denoising effects of Poynting vector filtering,Laplasse filtering and wave field separation show that the wave field separation method is relatively effective in these three methods.
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