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Efficient wavefield separation by reformulation of two-way wave-equation depth-extrapolation scheme
Geophysics, 2022ABSTRACT In two-way wave-equation depth migration by either time extrapolation or depth extrapolation, an efficient wavefield separation scheme (to separate two-way wavefields into their one-way counterparts: down- and upgoing waves) is typically required for high-quality imaging.
Jiachun You +3 more
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A TWO WAY SEMI-IMPLICIT SCHEME FOR SHALLOW WATER WAVE EQUATIONS
ISH Journal of Hydraulic Engineering, 1997ABSTRACT A 2D hydrodynamic model which is implicit in two coordinate directions has been developed for tidal propagation studies in rivers, coastal areas and seas. The coefficient matrix of the linear equation formed in this model becomes sparse and the equations are required to be solved by an iterative technique, such as the method of successive ...
L. K. Ghosh, S. Balakrishna, C. B. Singh
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Two-way wave equation depth migration using one-way propagator extrapolation
Exploration Geophysics, 2022Two-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 ...
Anyu Li, Xuewei Liu
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A Model-Based Two-Way Wave-Equation Approach for Multiple Prediction
69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007, 2007B034 A Model-Based Two-Way Wave-Equation Approach for Multiple Prediction Z. Jiang* (BP) & B. Hornby (BP) SUMMARY Multiples from the sea bed or salt boundary are usually strong and will interfere and generate artifacts on migration images. In order to attenuate these multiples one approach is to first predict and then subtract them.
Z. Jiang, B. Hornby
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Resolution analysis for targeted illumination using two‐way wave‐equations
SEG Technical Program Expanded Abstracts 2010, 2010Recent advances in imaging prestack seismic data, in particular, more accurate migration algorithms such as reverse-time migration (RTM), have made higher-quality images possible. However, tools to understand the factors affecting the quality of the results such as illumination are not readily available.
Cintia Lapilli +3 more
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𝐿² stable discontinuous Galerkin methods for one-dimensional two-way wave equations
Mathematics of Computation, 2016Simulating wave propagation is one of the fundamental problems in scientific computing. In this paper, we consider one-dimensional two-way wave equations, and investigate a family of L
Yingda Cheng +3 more
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Automatic Velocity Analysis with the Two-way Wave Equation
70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, 2008Migration velocity analysis constructs a velocity model by focusing a migration image in terms of a redundant coordinate, for instance surface offset or a shift at depth between forward and time-reversed wavefield. The latter option is considered here in the context of two-way wave equation modelling with a frequency-domain finite-difference code ...
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Principle of prestack migration based on the full elastic two-way wave equation
Geophysics, 1987Abstract The acoustic approximation in seismic migration is not allowed when the effects of wave conversion cannot be neglected, as is often the case in data with large offsets. Hence, seismic migration should ideally be founded on the full elastic wave equation, which describes compressional as well as shear waves in solid media ...
C. P. A. Wapenaar +2 more
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The Journal of the Acoustical Society of America, 1990
A method is introduced to calculate the influence of wind and temperature gradients in stratified media on sound propagating above an absorbing ground surface. It is based on the ‘‘two-way wave equation’’ for the Fourier transforms of the sound pressure P and its derivative V. The vector containing P and V is stepwise extrapolated through the medium in
L. Nijs, C. P. A. Wapenaar
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A method is introduced to calculate the influence of wind and temperature gradients in stratified media on sound propagating above an absorbing ground surface. It is based on the ‘‘two-way wave equation’’ for the Fourier transforms of the sound pressure P and its derivative V. The vector containing P and V is stepwise extrapolated through the medium in
L. Nijs, C. P. A. Wapenaar
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Angle-Domain Gathers Computation Using Poynting Vector of Two-Way Acoustic Wave Equation
Advanced Materials Research, 2014Based on two-way acoustic wave equation, we present a method for computing angle-domain common-image gathers for reverse time migration. The method calculates the propagation direction of source wave-fields and receiver wave-fields according to expression of energy flow density vectors (Poynting vectors) of acoustic wave equation in space-time domain ...
Jia Jia Yang, Bing Shou He, Ting Chen
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