Prestack Gaussian‐beam depth migration in anisotropic media

2006 ◽  
Author(s):  
Tianfei Zhu ◽  
Sam Gray ◽  
Daoliu Wang
Keyword(s):  
Gaussian Beam ◽  
Anisotropic Media ◽  
Depth Migration ◽  
Beam Depth

Prestack Gaussian-beam depth migration in anisotropic media

Geophysics ◽  
2007 ◽  
Vol 72 (3) ◽  
pp. S133-S138 ◽  
Author(s):  
Tianfei Zhu ◽  
Samuel H. Gray ◽  
Daoliu Wang
Keyword(s):  
Gaussian Beam ◽  
Ray Tracing ◽  
Synthetic Data ◽  
Transversely Isotropic ◽  
Anisotropic Media ◽  
Elastic Parameters ◽  
Depth Migration ◽  
Kirchhoff Migration ◽  
Beam Depth ◽  
Dynamic Ray Tracing

Gaussian-beam depth migration is a useful alternative to Kirchhoff and wave-equation migrations. It overcomes the limitations of Kirchhoff migration in imaging multipathing arrivals, while retaining its efficiency and its capability of imaging steep dips with turning waves. Extension of this migration method to anisotropic media has, however, been hampered by the difficulties in traditional kinematic and dynamic ray-tracing systems in inhomogeneous, anisotropic media. Formulated in terms of elastic parameters, the traditional anisotropic ray-tracing systems aredifficult to implement and inefficient for computation, especially for the dynamic ray-tracing system. They may also result inambiguity in specifying elastic parameters for a given medium.To overcome these difficulties, we have reformulated the ray-tracing systems in terms of phase velocity.These reformulated systems are simple and especially useful for general transversely isotropic and weak orthorhombic media, because the phase velocities for these two types of media can be computed with simple analytic expressions. These two types of media also represent the majority of anisotropy observed in sedimentary rocks. Based on these newly developed ray-tracing systems, we have extended prestack Gaussian-beam depth migration to general transversely isotropic media. Test results with synthetic data show that our anisotropic, prestack Gaussian-beam migration is accurate and efficient. It produces images superior to those generated by anisotropic, prestack Kirchhoff migration.

Common-shot prestack Gaussian beam depth migration in anisotropic media

2014 ◽  
Author(s):  
Duan XinYi* ◽  
Li Zhen Chun ◽  
Huang JianPing ◽  
Yang ShanShan ◽  
Zhang Qing
Keyword(s):  
Gaussian Beam ◽  
Anisotropic Media ◽  
Depth Migration ◽  
Beam Depth

Azimuth–opening angle domain imaging in 3D Gaussian beam depth migration

2013 ◽  
Vol 10 (2) ◽  
pp. 025013 ◽  
Author(s):  
Jiexiong Cai ◽  
Wubao Fang ◽  
Huazhong Wang
Keyword(s):  
Gaussian Beam ◽  
Opening Angle ◽  
Depth Migration ◽  
Beam Depth

Common-shot elastic Gaussian beam depth migration

2015 ◽  
Author(s):  
Jidong Yang* ◽  
Jianping Huang ◽  
Xin Wang ◽  
Zhenchun Li
Keyword(s):  
Gaussian Beam ◽  
Depth Migration ◽  
Beam Depth

True-amplitude Gaussian-beam migration

Geophysics ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. S11-S23 ◽  
Author(s):  
Samuel H. Gray ◽  
Norman Bleistein
Keyword(s):  
Wave Equation ◽  
Gaussian Beam ◽  
Opening Angle ◽  
Amplitude Wave ◽  
Amplitude Variation With Offset ◽  
Imaging Condition ◽  
Depth Migration ◽  
Kirchhoff Migration ◽  
Beam Depth ◽  
Gaussian Beam Migration

Gaussian-beam depth migration and related beam migration methods can image multiple arrivals, so they provide an accurate, flexible alternative to conventional single-arrival Kirchhoff migration. Also, they are not subject to the steep-dip limitations of many (so-called wave-equation) methods that use a one-way wave equation in depth to downward-continue wavefields. Previous presentations of Gaussian-beam migration have emphasized its kinematic imaging capabilities without addressing its amplitude fidelity. We offer two true-amplitude versions of Gaussian-beam migration. The first version combines aspects of the classic derivation of prestack Gaussian-beam migration with recent results on true-amplitude wave-equation migration, yields an expression involving a crosscorrelation imaging condition. To provide amplitude-versus-angle (AVA) information, true-amplitude wave-equation migration requires postmigration mapping from lateral distance (between image location and source location) to subsurface opening angle. However, Gaussian-beam migration does not require postmigration mapping to provide AVA data. Instead, the amplitudes and directions of the Gaussian beams provide information that the migration can use to produce AVA gathers as part of the migration process. The second version of true-amplitude Gaussian-beam migration is an expression involving a deconvolution imaging condition, yielding amplitude-variation-with-offset (AVO) information on migrated shot-domain common-image gathers.

Theory and application of Gaussian beam depth migration

2011 ◽  
Author(s):  
Cai Jie‐xiong ◽  
Fang Wu‐bao ◽  
Yang Qin‐yong
Keyword(s):  
Gaussian Beam ◽  
Depth Migration ◽  
Beam Depth

Prestack Gaussian beam depth migration under complex surface conditions

2010 ◽  
Vol 7 (2) ◽  
pp. 143-148 ◽  
Author(s):  
Yu-Bo Yue ◽  
Zhen-Chun Li ◽  
Ping Zhang ◽  
Xue-Feng Zhou ◽  
Ning Qin
Keyword(s):  
Gaussian Beam ◽  
Complex Surface ◽  
Surface Conditions ◽  
Depth Migration ◽  
Beam Depth

The common-shot prestack Gaussian beam depth migration in TTI media

2017 ◽  
Author(s):  
Li Junkang* ◽  
Li Zhenchun ◽  
Min Zhang ◽  
He Wenchang
Keyword(s):  
Gaussian Beam ◽  
Depth Migration ◽  
Beam Depth ◽  
The Common ◽  
Tti Media
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