一种角度域叠前时间偏移方法

An approach to prestack time migration in dip angle domain

提出的角度域叠前时间偏移方法,能够在偏移成像过程中直接生成倾角域成像道集,在倾角成像道集上确定真地层倾角与倾角成像区,获得的最终叠加剖面在保证构造正确成像的同时避免了过大偏移孔径带来偏移噪声的弊端,提高了剖面的信噪比。应用本文方法在南堡凹陷马头营凸起地区取得了较好的应用效果,表明该方法对于信噪比较低、偏移噪声大的地区具有较大的工业应用价值。

This paper proposes an approach to prestack time migration in dip angle domain,which can produce common dip-angle imaging gathers directly.Dip angles and imaging area can be determined on these gathers.The final imaging profile is right without migration noise,which could improve signal-to-noise ratio.This scheme was applied to real data of the Matouying structure in Napu sag,and the good results demonstrate that the approach to prestack time migration in dip angle domain has broad application prospects for low signalto-noise ratio and big noise area.