拉冬变换在处理海洋资料中的应用

近年来随着海洋地震勘探向深海区域的发展,由于巨厚海水层及曲折海底的影响所产生的水底多次波在地震勘探资料的所有干扰中逐渐占主要部分。水底多次波分布广、能量强,是资料处理中首要衰减的多次波干扰。拉冬变换是一种速度叠加变换,时间域里的偏移距轴在拉冬域里转换为速度轴,时间域不同的速度曲线变为拉冬域中不同的速度点,在时间域里不易分开的不同速度曲线在拉冬域里以不同的速度点分开。这样就可以根据有效波与水底多次渡在速度上的差异在拉冬域内区以不同的速度点分开,进而衰减水底多次波。

Application of Radom-transform in processing of marine seismic data

Along with the development of marine seismic exploration in abysmal area, extremely thick marine layer and seriously undulated marine bottom lead to water-bottom multiples and it becomes the main problem to resolve. It is widespread and has a magic, power so as to attenuate it firstly during seismic data processing. The Radon-transform is a velocity stack transform. In Radon-transform, offset-axes in time-domain is replaced by velocity-axes, various velocity curves in time-domain are changed into various velocity points so that we can separate the primary reflection from water-bottom multiples with different velocity points in Radon-domain and then attenuate it effectively.