Journal ArticleDOI
Reverse time migration
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In this article, the authors examined the alternative of carrying out the migration through a reverse time extrapolation, which may offer improvements over existing migration methods, especially in cases of steeply dipping structures with strong velocity contrasts.Abstract:
Migration of stacked or zero-offset sections is based on deriving the wave amplitude in space from wave field observations at the surface. Conventionally this calculation has been carried out through a depth extrapolation. We examine the alternative of carrying out the migration through a reverse time extrapolation. This approach may offer improvements over existing migration methods, especially in cases of steeply dipping structures with strong velocity contrasts. This migration method is tested using appropriate synthetic data sets.read more
Citations
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Journal ArticleDOI
An overview of full-waveform inversion in exploration geophysics
Jean Virieux,Stéphane Operto +1 more
TL;DR: This review attempts to illuminate the state of the art of FWI by building accurate starting models with automatic procedures and/or recording low frequencies, and improving computational efficiency by data-compression techniquestomake3DelasticFWIfeasible.
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
Reverse time migration with optimal checkpointing
TL;DR: This paper describes optimal checkpointing in a form which applies both to RTM and other applications of the adjoint state method, such as construction of velocity updates from prestack wave equation migration.
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
Frequency-domain finite-difference amplitude-preserving migration
TL;DR: In this article, the amplitude-preserving migration weights are proposed based on a Born approximation of the Hessian, which can be viewed as a pre-conditioner for a gradient-based optimization problem.
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
Synthetic seismograms: a finite ‐difference approach
TL;DR: In this paper, the authors propose a finite difference representation of the two-dimensional wave equation for field seismograms, which automatically accounts for the proper relative amplitudes of the various arrivals and includes the contributions of converted waves, Rayleigh waves, diffractions from faulted zones, and head waves.
Journal ArticleDOI
The Wave Equation Applied to Migration
TL;DR: Claerbout's method has been implemented for the migration of stacked seismic data as discussed by the authors, and a simplified description of the method is given together with an account of some of the practical programming problems and the types of inaccuracy encountered.
Journal ArticleDOI
Downward continuation of moveout‐corrected seismograms
TL;DR: In this article, a method for migration of seismic data based on numerical solutions of partial differential equations was developed for the geometry of a single source with a line of surface receivers, where the best receiver line for any reflector is just at (or above) the reflector.
Journal ArticleDOI
Wave Equation Migration with the Accurate Space Derivative METHOD
TL;DR: In this article, an alternative method, termed ASD (for Accurate Space Derivative), and its application to the wave equation migration problem is described. But this method cannot accommodate media with vertical as well as horizontal velocity variations.