PHASE-SHIFT MIGRATION WITH A VARIABLE-LENGTH SPATIAL TRANSFORM - AN ALGORITHM FOR MODERATELY VARYING LATERAL VELOCITIES

被引：3
|
作者：
BENSON, AK
机构：
[1] Brigham Young University, Department of Geology and Geophysics, Provo, Utah, 84602-4642
来源：
GEOPHYSICAL PROSPECTING | 1995年 / 43卷 / 06期
关键词：
D O I：
10.1111/j.1365-2478.1995.tb00277.x
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
A migration algorithm appropriate for moderately varying lateral velocity changes is developed as an extension of phase-shift migration by using a variable-length spatial transform. This process significantly reduces the number of lateral wavenumbers necessary to downward continue the data, and it replaces the spatial FFT with a simple recursion relationship. For a given frequency and position x, ten lateral wavenumbers are typically sufficient, and the migration algorithm produces accurate images when the velocity structure v(x, z) changes over a few depth intervals of thickness Delta z, with lateral velocity gradients up to 1.4 to 1.0.
引用
收藏
页码：729 / 741
页数：13
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