论文部分内容阅读
本文介绍一种基于τ-P变换的新的叠后深度偏移方法。这一方法是在均匀介质条件下根据波动方程推导出的。其基本思想是:在τ-p域中,当波场分解为它的平面波成分时,改变其τ、p值,再通过τ-p反变换回到深度域中,从而完成了地下界面的偏移归位。 方法所需的计算时间基本是与完成τ-p正、反变换所需时间相同,是一种快速的偏移方法。它可用于任意形状的地下界面,甚至在强干扰背景的条件下,也能提高资料的信噪比和改善信号的连续性。这一方法是在深度域中进行τ-p变换,故它能适应速度存在纵、横变化的地区。为了论证本方法的效果,本文给出了不同的正演理论模型和偏移结果的例子。
This paper introduces a new post-stack depth migration method based on τ-P transform. This method is derived from the wave equation under uniform medium conditions. The basic idea is that in the τ-p domain, when the wavefield decomposes into its plane wave components, its τ and p values are changed and then reversed by τ-p back into the depth domain, thereby completing the partial deviation of the subsurface Move back to bit. The computational time required for the method is basically the same as the time required to complete the τ-p forward and backward transforms, which is a fast method of offsetting. It can be used for any shape of the underground interface, even in strong interference background conditions, but also can improve the signal to noise ratio and improve signal continuity. This method is carried out in the depth domain τ-p transform, so it can adapt to the speed of vertical and horizontal changes in the region. In order to demonstrate the effectiveness of this method, we present examples of different forward modeling and migration results.