Journal ArticleDOI
Migration by extrapolation of time‐dependent boundary values*
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TLDR
In this article, a finite-difference solution of the two-dimensional acoustic wave equation is proposed to migrate an observed zero-offset wavefield as the solution of a boundary value problem in which the data are extrapolated backward in time.Abstract:
Migration of an observed zero-offset wavefield can be performed as the solution of a boundary value problem in which the data are extrapolated backward in time. This concept is implemented through a finite-difference solution of the two-dimensional acoustic wave equation. All depths are imaged simultaneously at time 0 (the imaging condition), and all dips (right up to vertical) are correctly migrated. Numerical examples illustrate this technique in both constant and variable velocity media.read more
Citations
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Proceedings ArticleDOI
3D finite difference computation on GPUs using CUDA
TL;DR: In this article, a GPU parallelization of the 3D finite difference computation using CUDA is described, which achieves the throughput of between 2,400 to over 3,000 million of output points per second on a single Tesla 10-series GPU.
Journal ArticleDOI
Improved amplitude preservation for prestack depth migration by inverse scattering theory
TL;DR: In this paper, a pseudo-Hessian matrix is used as a substitute for the approximate Hessian to enhance the faint images appearing at a later time in 2D prestack reverse time-migration sections.
Journal ArticleDOI
An effective imaging condition for reverse-time migration using wavefield decomposition
TL;DR: In this paper, a correlation-based imaging condition was proposed to eliminate low-frequency, high-amplitude noises commonly seen in a typical RTM image, which can seriously contaminate the signals in the image if they are not handled properly.
Journal ArticleDOI
Isotropic angle-domain elastic reverse-time migration
TL;DR: In this article, a boundary condition for multicomponent data is proposed for wave field migration in isotropic media, where the vertical and horizontal components of the data are taken as proxies for the P- and S-wave modes, which are imaged independently with the acoustic wave equations.
Journal ArticleDOI
Reverse-time migration using the Poynting vector
Kwangjin Yoon,Kurt J. Marfurt +1 more
TL;DR: In this article, the authors present several tactics to avoid artefacts in shot-domain reverse-time migration, such as muting of a shot gather before migration, or wavefront migration which performs correlation only within a time window following first arriving travel times, are useful in suppressing artefacts.
References
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Journal ArticleDOI
Migration by fourier transform
TL;DR: In this paper, two practical migration schemes utilizing the concept of wave equation conjugates are developed in order to reduce dispersion problems usually associated with this method at higher dips and frequencies.
Journal ArticleDOI
Absorbing boundary conditions for acoustic and elastic wave equations
Robert W. Clayton,Björn Engquist +1 more
TL;DR: In this article, boundary conditions are derived for numerical wave simulation that minimize artificial reflections from the edges of the domain of computation, based on paraxial approximations of the scalar and elastic wave equations.
Journal ArticleDOI
Fundamentals of geophysical data processing
TL;DR: The author shows how stable finite difference operators can be derived to extrapolate acoustic wavefields in space and is widely applied in the petroleum industry in its effort to image subsurface seismic reflectors.
Journal ArticleDOI
Accuracy of finite-difference modeling of the acoustic wave equation
TL;DR: In this paper, the authors considered the effect of grid dispersion on the accuracy of finite-difference seismograms and showed that the grid can be twice as coarse (five or more grid points per upper half-power wavelength) and good results can still be obtained.
Journal ArticleDOI
Propagation of elastic waves in layered media by finite difference methods
Z. Alterman,F. C. Karal +1 more
TL;DR: In this paper, a finite difference equation formulation for the equations of elasticity is presented and applied to the problem of a layered half-space with a buried point source emitting a compressional pulse.