Results 161 to 170 of about 1,087,074 (217)

Steep Dip Imaging Using an Orthogonal One-way Wave Equation Migration

71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009, 2009
SUMMARY An orthogonal one-way wave equation migration method is implemented to overcome the dip limitation of a one-way wave equation. Besides the conventional downward propagation of the source and receiver wave fields, an extra propagation along horizontal direction is introduced to eliminate the dip limitation. It is very efficient.
Yong Sun, Hongwei Wang
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Effective Optimization to One-Way Wave Equation Migration

Proceedings, 2009
Downward-continuation migration algorithms are a powerful tool for imaging complicated subsurface structures. The phase-shift plus interpolation (PSPI) algorithm is a downward-continuation algorithm that is still widely used in the industry due to its computational efficiency compared to other methods and its reasonable ability to handle lateral ...
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The multipoint‐symplectic approximation of one‐way wave‐equation operator

SEG Technical Program Expanded Abstracts 2001, 2001
Summary The infinite dimensional Hamiltonian system essentially describes the propagation of seismic wave. Being not maintained the Hamiltonian property, some conventional algorithms will not give correct wave field especially in case of complex media.
null Yanghui, Liu Hong, Li Youming
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Correlation‐based reflection waveform inversion by one‐way wave equations

Geophysical Prospecting, 2018
ABSTRACTReflection full waveform inversion can update subsurface velocity structure of the deeper part, but tends to get stuck in the local minima associated with the waveform misfit function. These local minima cause cycle skipping if the initial background velocity model is far from the true model.
Liangguo Dong, Zhongyi Fan, Hongzhi Wang, Benxin Chi, Yuzhu Liu   +4 more
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True-amplitude one-way wave equation migration in heterogenoues media

10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007, 2007
The one way wave equations (OWWE) can be used as a powerfull tool for imaging complex structures with less omputational cost then the reverse time migration. However, if we are interested in images with true amplitudes the migration results using the OWWE are not correct, because the transport equation obtained using the ray theoretical approximation ...
Flor A. Vivas, Reynam C. Pestana
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Surface related multiple imaging based on one-way wave equation

SEG Technical Program Expanded Abstracts 2013, 2013
Summary In order to avoid confusion in the interpretation of the seismic images at a later stage, multiple reflection events are normally considered as noise and need to be removed from the seismic data. In fact, multiples are also signals which contain the information of complex subsurface structure and can contribute to part of subsurface structure ...
Ye Yueming, Guo Qingxin, Zhuang Xijin, Li Zhenchun   +3 more
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One-way wave equations for seismoacoustic propagation in elastic waveguides

The Journal of the Acoustical Society of America, 1990
One-way or parabolic wave equations for time-harmonic propagation in two-dimensional elastic waveguides are considered. It is shown that the direct application of a rational linear approximation with real coefficients to the elastic wave propagation case results in exponential growth in the numerical solutions.
Brian T. R. Wetton, Gary H. Brooke
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Representation of seismic sources in the one‐way wave equations

GEOPHYSICS, 1990
One‐way extrapolation of downgoing and upgoing acoustic waves plays an essential role in the current practice of seismic migration (Berkhout, 1985; Stolt and Benson, 1986; Claerbout, 1985; Gardner, 1985). Generally, one‐way wave equations are derived for the source‐free situation.
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Wave equation illumination using sparse‐frequency one‐way wavefield extrapolation

SEG Technical Program Expanded Abstracts 2008, 2008
Seismic illumination can be predicted using one-way wavefield extrapolators and formulations for forward modeling and migration. Rather than compute a finely sampled set of frequencies over the bandwidth of interest, I compute only a decimated set of frequencies and rely on the fact that for a single reflecting horizon, or a set of nearby horizons, the
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Time‐domain behavior of wide‐angle one‐way wave equations

GEOPHYSICS, 1991
The constant‐coefficient inhomogeneous wave equation reads [Formula: see text], Eq. (1) where t is the time; x, z are Cartesian coordinates; c is the sound speed; and δ(.) is the Dirac delta source function located at the origin. The solution to the wave equation could be synthesized in terms of plane waves traveling in all directions.
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