Journal ArticleDOI
High-Resolution Anisotropic Prestack Kirchhoff Dynamic Focused Beam Migration
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TLDR
The high-resolution anisotropic Kirchhoff dynamic focused beam migration is proposed to solve the two problems of local plane wave decomposition and the divergence of beams.Abstract:
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.read more
Citations
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References
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Journal ArticleDOI
Computation of wave fields in inhomogeneous media — Gaussian beam approach
TL;DR: In this paper, an asymptotic procedure for the computation of wave fields in two-dimensional laterally inhomogeneous media is proposed based on the simulation of the wave field by a system of Gaussian beams.
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Prestack Gaussian‐beam depth migration
TL;DR: In this paper, the authors proposed a beam superposition based beam migration method, which is an extension of Kirchhoff migration that overcomes many of the problems caused by multipathing.
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Gaussian beam migration
TL;DR: In this paper, a zero-offset depth migration method that employs Gaussian beam downward continuation of the recorded wave field is described, which is especially compatible with lateral variations in velocity.
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Seismic Rays and Ray Intensities in Inhomogeneous Anisotropic Media
TL;DR: In this article, a ray series expansion for seismic body waves propagating in inhomogeneous anisotropic media is studied, and methods for calculation of rays and amplitude coefficients of the ray series are suggested.
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Denoising of Hyperspectral Images Using Nonconvex Low Rank Matrix Approximation
TL;DR: This paper reformulates the approximation problem using nonconvex regularizer instead of the traditional nuclear norm, resulting in a tighter approximation of the original sparsity-regularised rank function and develops an iterative algorithm based on the augmented Lagrangian multipliers method that can preserve large-scale image structures and small-scale details well.