High-Resolution Anisotropic Prestack Kirchhoff Dynamic Focused Beam Migration

Kirchhoff beam migration is a kind of ray-based seismic imaging method boasting the advantages of both high efficiency and high accuracy. In this paper, anisotropic ray tracing will be applied to extend it to an anisotropic seismic imaging method. However, two problems exist in this method for imagi...

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Bibliographic Details
Published in:IEEE sensors journal 2020-10, Vol.20 (20), p.11753-11760
Main Authors: Sun, Hui, Gao, Cheng, Zhang, Zhihou, Liao, Xiaolong, Wang, Xuyu, Yang, Junjie
Format: Article
Language:English
Subjects:
Acoustic beams
anisotropic imaging method
beam migration
beam propagator
Decomposition
Geology
High resolution
high-resolution radon transform
image denoising
Imaging
Ion beams
Laser beams
Media
Noise propagation
Noise reduction
Plane waves
Prestack depth migration
Ray tracing
Structural beams
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Summary:Kirchhoff beam migration is a kind of ray-based seismic imaging method boasting the advantages of both high efficiency and high accuracy. In this paper, anisotropic ray tracing will be applied to extend it to an anisotropic seismic imaging method. However, two problems exist in this method for imaging calculation: Firstly, the conventional local plane wave decomposition method has a low computational precision; secondly, the original beam propagator diverges quickly when the propagation distance increases. These two problems can both increase imaging noise, and finally reduce the resolution of the final imaging results. In this paper, the high-resolution anisotropic Kirchhoff dynamic focused beam migration is proposed to solve these two problems. Local plane wave decomposition method considered from the perspective of inversion is employed to obtain higher-quality slant stack data and dynamic focused beam propagator is adopted to control the divergence of beams. Both the anisotropic layer model and Hess model are adopted to test the imaging ability of the new method.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2019.2933200