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moveout

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Journal Article
Journal: Geophysics
Published: 23 July 2020
Geophysics (2020) 85 (5): O71–O82.
...Luke Decker; Qunshan Zhang ABSTRACT We have developed a novel application of dynamic time warping (DTW) for correcting residual moveout in image gathers, enhancing seismic images, and determining azimuthal anisotropic orientation and relative intensity when moveout is caused by wave propagation...
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Journal Article
Journal: Geophysics
Published: 21 January 2020
Geophysics (2020) 85 (2): C61–C70.
...Véronique Farra; Ivan Pšenčík ABSTRACT We present an approximate nonhyperbolic P-wave moveout formula applicable to horizontally layered media of moderate or weak anisotropy of arbitrary symmetry and orientation. Anisotropy symmetry and its orientation may differ from layer to layer. Instead...
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Journal Article
Journal: Geophysics
Published: 09 October 2019
Geophysics (2019) 84 (6): C269–C279.
... phase velocity equation is readily calculated, there is not an explicit equation for the exact group velocity as a function of group angle nor for the traveltime as a function of offset. Accordingly, we have developed new approximate phase velocity, group velocity, and moveout equations for acoustic...
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Journal Article
Journal: Geophysics
Published: 12 August 2019
Geophysics (2019) 84 (5): C229–C237.
...Shibo Xu; Alexey Stovas ABSTRACT The moveout approximations are commonly used in seismic data processing such as velocity analysis, modeling, and time migration. The anisotropic effect is very obvious for a converted wave when estimating the physical and processing parameters from the real data...
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Journal Article
Journal: Geophysics
Published: 27 May 2019
Geophysics (2019) 84 (4): V233–V243.
...Dingyue Chang; Cai Zhang; Tianyue Hu; Dan Wang ABSTRACT Moveout correction for irregular topography has been a longstanding challenge in processing seismic exploration data. Irregular topography usually results in large moveout among traces, a low signal-to-noise ratio (S/N), and difficulty...
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Journal Article
Journal: Geophysics
Published: 13 May 2019
Geophysics (2019) 84 (4): R507–R525.
.... The objective function of our new method consists of three terms: The first and second terms penalize the moveout residuals computed from PP and PS plane-wave CIGs, respectively, and the third term constrains the nonzero relative depth shifts between the PP and PS migration images. The moveout of plane-wave...
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Journal Article
Journal: Geophysics
Published: 01 April 2019
Geophysics (2019) 84 (3): KS119–KS131.
... velocity model is known and are very sensitive to errors in its estimation. Velocity is often estimated at recording borehole locations and calibrated if possible. However, calibration requires manual picking that may induce errors. We use moveout-corrected gathers, whose flatness serves as an objective...
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Journal Article
Journal: Geophysics
Published: 04 February 2019
Geophysics (2019) 84 (2): C75–C83.
...Véronique Farra; Ivan Pšenčík ABSTRACT A description of the subsurface is incomplete without the use of S-waves. Use of converted waves is one way to involve S-waves. We have developed and tested an approximate formula for the reflection moveout of a wave converted at a horizontal reflector...
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Journal Article
Journal: Geophysics
Published: 13 December 2018
Geophysics (2019) 84 (1): V45–V54.
...Yue Ma; Yi Luo; Panos Kelamis ABSTRACT Normal moveout (NMO) correction is routinely applied to each common-midpoint (CMP) gather before forming a stack section. Trace stretching is inherent in the conventional NMO correction, causing frequency distortion and temporal resolution degradation...
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Journal Article
Journal: Geophysics
Published: 15 November 2018
Geophysics (2018) 83 (6): U79–U88.
.... Nonhyperbolic velocity analysis provides very useful information during the processing and interpretation of seismic data. The most common approach for considering anisotropy during velocity analysis is to describe the moveout based on a nonhyperbolic equation. The nonhyperbolic moveout equation in vertically...
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Journal Article
Journal: Geophysics
Published: 28 June 2018
Geophysics (2018) 83 (4): V263–V282.
... learned atom is constrained to represent an elementary waveform that has a constant amplitude along a parabolic traveltime moveout. The parabolic structure is consistent with the physics inherent to the seismic wavefield and can be used to easily interpolate or extrapolate the atoms. Hence, we have...
Journal Article
Journal: Geophysics
Published: 11 January 2018
Geophysics (2018) 83 (2): S173–S185.
...Momoe Sakamori; Ricardo Biloti ABSTRACT Errors in the migration velocity field are perceived as moveouts in common-image gathers (CIGs). These moveouts depend on discrepancies in the velocity field as well as in the dip of the reflectors. We extend previous works into two main aspects. First, we...
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Journal Article
Journal: Geophysics
Published: 27 October 2017
Geophysics (2017) 82 (6): U87–U97.
...Mohammad Javad Khoshnavaz ABSTRACT Oriented time-domain imaging can be orders of magnitude faster than the routine techniques, which rely on velocity analysis. The term “oriented” refers to those techniques that use the information carried by local slopes. Time-domain dip moveout (DMO) correction...
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Journal Article
Journal: Geophysics
Published: 05 October 2017
Geophysics (2017) 82 (6): C229–C240.
...Shibo Xu; Alexey Stovas ABSTRACT We have defined a group of new parameterizations for P-wave in acoustic orthorhombic (ORT) media with three cross-term normal moveout velocities and three cross-term anellipticity parameters. The corresponding perturbation-based approximations for traveltime in ORT...
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Journal Article
Journal: Geophysics
Published: 06 September 2017
Geophysics (2017) 82 (6): C187–C200.
...Yuriy Ivanov; Alexey Stovas ABSTRACT Traveltime parameters, defined through the series coefficients of the traveltime squared as a function of the horizontal offset projections, play an important role in moveout approximations and corrections, and in model parameter inversion. We evaluate...
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Journal Article
Journal: Geophysics
Published: 18 August 2017
Geophysics (2017) 82 (5): C175–C185.
...Ivan Pšenčík; Véronique Farra ABSTRACT We have developed approximate nonhyperbolic P-wave moveout formulas applicable to weakly or moderately anisotropic media of arbitrary anisotropy symmetry and orientation. Instead of the commonly used Taylor expansion of the square of the reflection traveltime...
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Journal Article
Journal: Geophysics
Published: 16 August 2017
Geophysics (2017) 82 (5): S377–S389.
... attenuation ( Zhang and Sun, 2008 ; Duan and Sava, 2014 ). The extended images also contain the moveout information that can be used for angle decomposition, as we illustrate in the following section. The extended imaging condition in equations  7 – 10 preserves the information necessary...
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Journal Article
Journal: Geophysics
Published: 01 June 2017
Geophysics (2017) 82 (4): V275–V283.
... Geophysicists diffraction moveout multiparameter stacking traveltime The common-midpoint (CMP) stack by Mayne (1962) has been successfully used for half a century and is still a common strategy. This method is very robust in most cases but does not perform well in very noisy data. Alternative...
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Journal Article
Journal: Geophysics
Published: 31 May 2017
Geophysics (2017) 82 (4): V257–V274.
...Necati Gülünay ABSTRACT The diminishing residual matrices (DRM) method can be used to surface-consistently decompose individual trace statics into source and receiver components. The statics to be decomposed may either be first-arrival times after the application of linear moveout associated...
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Journal Article
Journal: Geophysics
Published: 25 May 2017
Geophysics (2017) 82 (4): WA23–WA32.
...Véronique Farra; Ivan Pšenčík ABSTRACT We have developed approximate P-wave reflection moveout formulas for a homogeneous layer of orthorhombic symmetry overlying a horizontal or dipping reflector. The symmetry planes of an orthorhombic medium in the layer can be arbitrarily oriented. The formulas...
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