Anisotropic converted wave amplitude-preserving prestack time migration by the pseudo-offset method

Zhang, Liyan; Liu, Yang

doi:10.1007/s11770-008-0030-6

Cited by 7 publications

(3 citation statements)

References 23 publications

(15 reference statements)

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“…Tarantola (1984a) solves the inversion problem in the acoustic approximation of seismic reflection data based on the generalized least-squares criterion. Pseudooffset migration was introduced in the converted-wave prestack time-migration method to obtain amplitude-preserved images from anisotropic media (Zhang and Liu, 2008).…”

Section: Introductionmentioning

confidence: 99%

Generalized staining algorithm for seismic modeling and migration

Jia

2017

GEOPHYSICS

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The staining algorithm is introduced to improve the signal-tonoise ratio (S/N) of poorly illuminated subsurface structures in seismic imaging. However, the amplitudes of the original and the stained wavefield, i.e., the real and the imaginary wavefields, differ by several orders of magnitude, and the waveform of the stained wavefield may be greatly distorted. We have developed a generalized staining algorithm (GSA) to achieve amplitude preservation in the stained wavefield. The real wavefield and the stained wavefield propagate in the same velocity model. A source wavelet is used as the source of the real wavefield; however, the real wavefield is extracted from the stained area as the source of the stained wavefield. The GSA maintains some properties of the original staining algorithm. The stained wavefield is synchronized with the real wavefield, and it contains only information relevant to the target region. By imaging with the stained wavefield, we obtain higher S/Ns in images of target structures. The most significant advantage of our method is the amplitude preservation of the stained wavefield, which means that this method could potentially be used in quantitative illumination analysis and velocity model building. The GSA could be adopted easily for frequencydomain wavefield propagators and time-domain propagators. Furthermore, the GSA can generate any number of stained wavefields. Numerical experiments demonstrate these features of the GSA, and we apply this method in target-oriented modeling and imaging as well as obtaining amplitude-preserved stained wavefields and higher S/Ns in images of target structures.

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Section: Introductionmentioning

confidence: 99%

Generalized staining algorithm for seismic modeling and migration

Jia

2017

GEOPHYSICS

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“…Ye et al (2008) proposed preserved amplitude migration for irregular surface areas. In the fi eld of preserved amplitude prestack time migration, Zhang and Liu (2008) proposed a method to perform preserved amplitude pre-stack time migration for anisotropic converted waves and Wang et al (2008) used the preserved amplitude pre-stack time migration of plane waves to do AVA analysis, both of which showed an improved amplitude fi delity.…”

Section: Introductionmentioning

confidence: 99%

Preserved amplitude migration based on the one way wave equation in the angle domain

Zhu³

et al. 2009

Appl. Geophys.

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Traditional pre-stack depth migration can only provide subsurface structural information. However, simple structure information is insuffi cient for petroleum exploration which also needs amplitude information proportional to reflection coefficients. In recent years, pre-stack depth migration algorithms which preserve amplitudes and based on the oneway wave equation have been developed. Using the method in the shot domain requires a deconvolution imaging condition which produces some instability in areas with complicated structure and dramatic lateral variation in velocity. Depth migration with preserved amplitude based on the angle domain can overcome the instability of the one-way wave migration imaging condition with preserved amplitude. It can also offer provide velocity analysis in the angle domain of common imaging point gathers. In this paper, based on the foundation of the one-way wave continuation operator with preserved amplitude, we realized the preserved amplitude prestack depth migration in the angle domain. Models and real data validate the accuracy of the method.

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“…Duzhirin (2003) proposed the method of decoupled elastic prestack depth migration. Zhang and Liu (2008) studied anisotropic converted wave prestack migration. Wang (2004) projected the data of the elastic vectorial wave-fi eld to the ray direction and then performed traditional scalar acoustic Kirchhoff migration, in which the computation of wave-field separation was avoided.…”

Section: Introductionmentioning

confidence: 99%

Elastic Kirchhoff migration of vectorial wave-fields

Hou

2008

Appl. Geophys.

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Based on Kuo and Dai's vectorial wave-fi eld extrapolation equations, we derive new Kirchhoff migration equations by introducing unit vectors which represent the ray directions at the imaging points of the refl ected P-and PS converted-waves. Furthermore, using the slope of the events on shot records and a ray racing procedure, mirror-image refl ection points are found and the refl ection data are smeared along the Fresnel zone. The migration method proposed in this paper solves two troublesome imaging problems caused by limited receiving aperture and migration artifacts resulting from wave propagation at the velocities of non original wave type. The migration method is applied successfully with model data, demonstrating that the new method is effective and correct.

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Anisotropic converted wave amplitude-preserving prestack time migration by the pseudo-offset method

Cited by 7 publications

References 23 publications

Generalized staining algorithm for seismic modeling and migration

Generalized staining algorithm for seismic modeling and migration

Preserved amplitude migration based on the one way wave equation in the angle domain

Elastic Kirchhoff migration of vectorial wave-fields

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