DMO后的速度分析问题

当前在二维地震资料处理过程中 ,DMO处理仍然沿用传统的做法 ,即在获得共反射点道集后 ,仍采用共中心点道集的时距曲线方程进行速度分析。因此 ,获得的速度分析结果低于介质的均方根速度。针对这种情况 ,本文对二维情况下共反射点道集的速度分析问题进行了讨论 ,并导出了可直接用于进行 CRP道集速度分析的时距关系方程式 ,从而为 DMO后的速度分析及其动校正提供了一种理论基础

ON THE VELOCITY ANALYSIS AFTER DMO

In 2D seismic data processing, the traditional DMO flow is still continuously used at present,that is,the time distance curve equation of common midpoint gather is adopted yet for the velocity analysis of common reflection point gather.As a result,the velocity calculated is lower than the root mean square velocity of media.In view of this situation,this paper discusses the problem of velocity analysis for 2D CRP gather,and derives a time distance equation that can be applied directly to the CRP gather velocity analysis,providing a theoretic basis for the velocity analysis and normal moveout correction after DMO .