倾角域自适应孔径叠前时间偏移

Adaptive aperture prestack time migration in the dip angle domain

本文利用倾角成像道集确定真地层倾角和倾角成像区,避免了用常规方法直接求取地层倾角的巨大困难,在叠前时间偏移过程中可根据地层倾角自适应地确定偏移孔径,既保证了构造正确成像,同时又避免了过大偏移孔径导致的偏移噪声产生的弊端,提高了剖面的信噪比。应用本文方法在南堡凹陷老爷庙构造地区取得了较好的应用效果,表明该方法在信噪比较低、偏移噪声较大地区具有广阔的应用前景。

This paper proposes an adaptive aperture prestack time migration.We get true dip angles and dip-angle imaging area with dip angle gathers,and avoids great difficulties in directly determining dip angles with conventional methods.The adaptive aperture based on dip angles during prestack time migration ensures right structure imaging without migration noise due to aperture exaggeration,and improves signal-to-noise ratio.The proposed approach is applied to real data of Laoyemiao structures in Napu Sag,China,and good results demonstrate that the proposed approach has broad prospects in the future.