应用程函方程的差分解法实现井间地震资料的反射成像

Reflection imaging of crosswell seismic data by finite-difference solution of cikonal equation

地矿部石油物探研究所, 南京210014

Research Institute of Geophysical Prospecting for Petrolcum, MGMR. Nanjing 210014

本文给出了一种偏移共炮点道集地震资料的方法。它利用程函方程的差分解法求出空间任一点到所有地点和接收点处的地震波旅行时和射线路径,然后根据斯奈尔定律找出所有满足反射规律的炮检对,根据其相应道上成像时间处的地震反射波振幅的叠加来实现地震资料的叠前深度偏移。该方法适应于介质速度的纵向及横向变化。

This paper presents a migration method for common source seismic gathers. The first step of the method is to get traveltimes at all grid points by FD solution of 2D eikonal equation, then for each reflection point to find out the traces at source-receiver points obeying Snell’s law. Prestack depth migration can be achieved by summing amplitudes according to traveltimes of these traces.