Results 141 to 150 of about 1,087,074 (217)
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Imaging complex salt bodies with turning‐wave one‐way wave equation
SEG Technical Program Expanded Abstracts 2006, 2006We propose a modified version of one-way wave equation migration which incorporates true amplitude corrections to enhance steep dips and propagates wavefields to any possible directions. With this new method, turning waves can be properly imaged and the imaging capability of one-way wave equation is greatly improved.
Yu Zhang, Sheng Xu, Guanquan Zhang
semanticscholar +2 more sources
One-way wave-equation migration in log-polar coordinates
GEOPHYSICS, 2013We obtained acoustic wave and wavefield extrapolation equations in log-polar coordinates (LPCs) and tried to enhance the imaging. To achieve this goal, it was necessary to decrease the angle between the wavefield extrapolation axis and wave propagation direction in the one-way wave-equation migration (WEM).
Diako Hariri Naghadeh, M. Riahi
semanticscholar +2 more sources
The one-way wave equation and its invariance properties
Journal of Physics A: Mathematical and Theoretical, 2009The harmonic wave equation in inhomogeneous media is exactly split into coupled first-order equations with respect to a principal direction of propagation according to the Bremmer scheme. The resulting one-way wave equation is shown not to conserve energy flux for dimensions two and three against the general belief in one-way wave propagation or ...
L. Leviandier
semanticscholar +2 more sources
ON INVERSE SOURCE PROBLEMS FOR THE ONE-WAY WAVE EQUATION
Wave Motion, 1998zbMATH Open Web Interface contents unavailable due to conflicting licenses.
D. Wall, J. Lundstedt
semanticscholar +3 more sources
Dip angle-compensated one-way wave equation migration
Exploration Geophysics, 2010Conventional migration algorithms based on one-way wave equations in a Cartesian coordinate system often underestimateamplitudes,especiallyatlargepropagationorreflectionangles.Thishasadeleteriouseffectonseismicimages and should be corrected. We illustrate the nature of the problem by working in the more natural spherical coordinate system and offer two
Weijia Sun, Binzhong Zhou, L. Fu
semanticscholar +2 more sources
Full-waveform inversion using the one-way wave equation
13th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 26–29 August 2013, 2013The classical full-waveform inversion is a method for obtaining detailed velocity models of the subsurface, formulated as an inverse problem, in which modeling and adjoint operators use the two-way wave equation. Solving the wave equation with the two-way propagator is computationally demanding when compared to the less accurate one-way propagator ...
C. Guerra, Carlos Cunha
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The Theory of True Amplitude One-Way Wave Equation Migrations
Chinese Journal of Geophysics, 2006AbstractIn this technical report, we review the recent development of true amplitude one‐way wave equation migration and summarize the migrated amplitude performance from different one‐way wave equations. To produce correct amplitude from postack phase‐shift migration, we have to apply accurate geometrical spreading compensation in preprocessing ...
Yu Zhang
semanticscholar +2 more sources
Imaging Complex Salt Bodies with Turning-Wave One-Way Wave Equation Migration
68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006, 2006In this paper we propose a modified version of the one-way wave equation migration that can propagate wavefields to any possible direction. Also, we incorporate true amplitude corrections in the migration to enhance steep dips. With this new method, turning waves are properly imaged.
Y. Zhang, S. Xu, G. Zhang
semanticscholar +2 more sources
Two-way wave equation depth migration using one-way propagator extrapolation
Exploration Geophysics, 2021Two-way wave depth migration (TWDM) can achieve a wider imaging angle in media with significant lateral velocity changes and better imaging results for complex structures with high dip angles than in conventional one-way wave depth migration ...
Anyu Li, Xuewei Liu
semanticscholar +1 more source
Efficient wavefield separation by reformulation of two-way wave-equation depth-extrapolation scheme
Geophysics, 2022In two-way wave equation depth migration by either time-extrapolation or depth-extrapolation, an efficient wavefield separation scheme (to separate two-way wavefields to their one-way counterparts: down- and up-going waves) is typically required for high
Jiachun You +3 more
semanticscholar +1 more source