Numerical tests of 3D true‐amplitude zero‐offset migration1
作者:
E. Filpo,
P. Hubral,
期刊:
Geophysical Prospecting
(WILEY Available online 1995)
卷期:
Volume 43,
issue 1
页码: 119-134
ISSN:0016-8025
年代: 1995
DOI:10.1111/j.1365-2478.1995.tb00127.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
AbstracrAn amplitude‐preserving migration aims at imaging compressional primary (zero‐or) non‐zero‐offset reflections into 3D time or depth‐migrated reflections so that the migrated wavefield amplitudes are a measure of angle‐dependent reflection coeffcients. The principal objective is the removal of the geometrical‐spreading factor of the primary reflections. Various migration/inversion algorithms involving weighted diffraction stacks proposed recently are based on Born or Kirchhoff approximations. Here, a 3D Kirchhoff‐type zero‐offset migration approach, also known as a diffraction‐stack migration, is implemented in the form of a time migration. The primary reflections of the wavefield to be imaged are describeda prioriby the zero‐order ray approximation. The aim of removing the geometrical‐ spreading loss can, in the zero‐offset case, be achieved by not applying weights to the data before stacking them. This case alone has been implemented in this work. Application of the method to 3D synthetic zero‐offset data proves that an amplitude‐preserving migration can be performed in this way. Various numerical aspects of the true‐amplitude zero
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