摘要
本文介绍了常速F-K偏移及垂向变速的相移偏移方法。两种偏移方法的结合可发展成为一种新的F-K域偏移方法—递归F-K波动方程偏移。该方法适合于任意的垂向速度变化,其偏移精度与相移法偏移一样不受倾角限制,且计算时间比相移法大大减少。本偏移频域插值过程中,采用截取精确插值公式两项系数的SINC频域插值算子,既保证了偏移剖面不出现假同相轴,且时间方向FFT数据长度又不需补零加倍,因而又节省了一半的偏移处理时间。
This paper describes the methods of the F-K migration for constant-velocity media and the phase-shift migration with vertical velocity variations. By combining both migration methods, we have obtained a new F-K wave equation migration. It removes restriction on vertical velocity varation, yielding accucracy comparable to phase-shift migration at only a fraction of the computional time. During the migration interpolation process in the F-K domain we have used the SINC interpolation operator that truncates of the exact interpolation series to only two terms so as to produce good results for migration, i. e., no false events appear in the migration results and no padding zeros are needed to the fourier transform time series, Thus, about half of the migration processing time is depressed.
出处
《物探化探计算技术》
CAS
CSCD
1991年第3期207-212,共6页
Computing Techniques For Geophysical and Geochemical Exploration
