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叠前逆时偏移在解决陡倾角构造和复杂速度模型成像上展示出了极佳的优越性,但是低频噪声的存在严重影响了成像的质量.Poynting矢量的方向代表了介质中地震波的传播方向,根据Poynting矢量可以计算出反射角并且可将地震波场分离成上行波、下行波.本文提出了一种新的成像条件,同方向上下行波互相关成像噪声和大角度成像噪声可以得到较好的压制.相比于常规的互相关成像条件,该方法简单易行,所需额外的计算量和存储量极小,将该成像条件应用在Marmousi模型上,偏移结果显示低频噪声得到很好的压制.
Prestack RTM shows excellent superiority in solving steep dip structures and complex velocity model imaging, but the presence of low frequency noise seriously affects the imaging quality.The direction of the Poynting vector represents the direction of seismic wave propagation in the medium , The reflection angle can be calculated based on the Poynting vector and the seismic wavefield can be separated into the up-going wave and the down-going wave.This paper presents a new imaging condition that the inter-related imaging noise and high-angle imaging noise in the same direction can be better Compared with the conventional cross-correlation imaging conditions, the method is simple and easy, the extra computation and memory required is very small, the imaging conditions are applied to the Marmousi model, the offset results show that low-frequency noise is very good suppress.