复杂地区三维叠前时间偏移技术的应用

Application of 3D Pre-stack Time Migration Technology in Complex Areas

在常规地震数据处理过程中,反射波的偏移成像是基于地震数据的共深度点或共中心点叠加技术进行的。在地下地质构造相对复杂的地区,由于叠加过程的引入,导致了一些来自于大倾角地层或细微地质现象产生的地震反射信息的畸变或损失。而目前在算法上已经较为成熟的叠前偏移成像技术,便弥补了叠后偏移成像的不足。特别是在山前复杂构造区带,叠前偏移不仅能够使反射波准确成像,而且能够改善地震数据的信噪比和分辨率。

In conventional seismic data processing,reflect wave migration images are based on common depth point (CDP)or common midpoint (CMP)stacking technology.In an area with relative complex geologic structures,introduction of stacking process may result in some aberrance or lost of seismic reflect information from big dip-angle strata or fine or micro geologic phenomenon.The currently matured pre-stack migration imaging technique in computation can compen-sate limitations of post-stack migration imaging technique,particularly in pediment area with complex structures.This technique can not only make images of reflect waves properly,but also improve signal to noise ratio and resolution of seismic data.