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Fowler's dip moveout

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Journal Article
Journal: Geophysics
Published: 01 June 1996
Geophysics (1996) 61 (3): 835–844.
...John Anderson; Tariq Alkhalifah; Ilya Tsvankin Abstract The main advantage of Fowler's dip-moveout (DMO) method is the ability to perform velocity analysis along with the DMO removal. This feature of Fowler DMO becomes even more attractive in anisotropic media, where imaging methods are hampered...
Book Chapter

Author(s)
Dave Hale
Series: Society of Exploration Geophysicists Course Notes
Published: 01 January 1991
DOI: 10.1190/1.9781560802204.ch3
EISBN: 9781560802204
... Abstract Dip-moveout, as the name implies, is a dip-dependent process. The frequency-wavenumber domain is a particularly useful domain in which to apply dip-dependent processes, because all reflections with a particular slope in the time-space domain are mapped to a single radial line by a two...
Series: Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 2012
DOI: 10.1190/1.9781560803003.ch8
EISBN: 9781560803003
... implementation Fowler DMO in isotropic media Stolt poststack migration Dip moveout by Fourier transform Discussion Hale's DMO method Synthetic example Field-data example Discussion Possible extensions of the algorithm Summary Time and depth migration Phase-shift (Gazdag...
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Series: Society of Exploration Geophysicists Geophysics Reprint Series
Published: 01 January 2008
EISBN: 9781560801917
... in interval velocity to the changes in the parameters governing residual moveout can be found This linear operator can be used as part of an optimization method that finds the interval velocity model that best images the data. Introduction This work follows that of Toldi (1985) and Fowler (1986...
Journal Article
Journal: Geophysics
Published: 28 April 2016
Geophysics (2016) 81 (3): S139–S150.
... parameters on the shape of the residual moveout (RMO) in P-wave RTM extended images for VTI (transversely isotropic with a vertical symmetry axis) media. Using the actual spatial distribution of the zero-dip NMO velocity ( V nmo ), which could be approximately estimated by conventional techniques, we analyze...
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Series: Society of Exploration Geophysicists Course Notes
Published: 01 January 2007
DOI: 10.1190/1.9781560801658.A4
EISBN: 9781560801658
... Geophysics 61 409-421 690 Fowler, P. J. Jun. 1998 A comparative overview of prestack time Exp. Abs. EAGE 1-17 697 Fowler, P. J. Sep. 1998 A comparative overview of dip moveout Exp. Abs. SEG 1744-1747 Figure A4.1 DMO ellipses for defining a) conventional NMO and DMO, and b) GDMO...
FIGURES
Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (5): 1650–1661.
... principles. The main theoretical result is a decomposition of prestack velocity continuation into three different components corresponding to residual normal moveout, residual dip moveout, and residual zero-offset migration. I analyze the contribution and properties of each of the three components separately...
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Series: Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 2012
DOI: 10.1190/1.9781560803003.ch7
EISBN: 9781560803003
... the parameters V nmo (0) and η from P-wave reflection moveout recorded in both 2D and 3D geometries. [One more algorithm for time-domain velocity analysis, based on the DMO method of Fowler (1984 , 1988 ), is described in chapter 8 .] Then the results of chapter 5 are used to combine dip-dependent...
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Journal Article
Journal: The Leading Edge
Published: 01 February 2001
The Leading Edge (2001) 20 (2): 132–144.
...; Fowler, 1984; Li et al., 1991). First, we demonstrate the interpretive imaging concept by performing prestack time migration using a range of constant velocities as suggested by Shurtleff (1984). Then, a particularly efficient and elegant variation of the method by Fowler (1984) is demonstrated...
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Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (5): 1662–1672.
... to modeling zero-offset data for depth migration ( Kim et al., 1997 ). In the most common form, migration velocity analysis amounts to residual moveout correction on common image point (CIP) gathers. However, in the case of dipping reflectors, this correction does not provide optimal focusing of reflection...
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Journal Article
Journal: Geophysics
Published: 28 September 2009
Geophysics (2009) 74 (5): WB117–WB127.
.... The 2D interval moveout-inversion methods based on ideas similar to those behind VILS have been developed by Van der Baan and Kendall (2002 , 2003 ) and Fowler et al. (2008) . In contrast to VILS, however, these methods assume the invariance of the horizontal slowness (ray parameter) along each ray...
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Journal Article
Journal: Geophysics
Published: 16 June 2011
Geophysics (2011) 76 (4): U45–U57.
... of the slope estimates. This procedure usually returns noisy and biased curvature values that affect parameter estimation, especially for those parameters that control long-spread/large-angle moveout. Fowler's equations offer a solution to this problem. In these equations, curvature dependence is absorbed...
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Journal Article
Journal: Geophysics
Published: 01 January 2002
Geophysics (2002) 67 (2): 639–643.
... model. Thus, a simple ray-based procedure that could be used in the context of NMO/dip moveout (DMO)/stacking would be desirable. However, if the effects of nonvertical raypaths are significant, the time shifts caused by the elevation effect are no longer the same for the whole trace (static...
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Series: Society of Exploration Geophysicists Geophysics Reprint Series
Published: 01 January 2008
EISBN: 9781560801917
... migration algorithms. If the image indicates undermigration, we should increase the value of η ; to correct for overmigra-tion, η needs to be reduced. A natural way to include this inversion technique in the processing flow is to apply a Fowler-type dip-moveout method ( Fowler, 1984 ), which transforms...
Series: Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 2011
DOI: 10.1190/1.9781560802839.ch3
EISBN: 9781560802839
...) The analytic solution, supported by numerical examples, describes the complicated, multilobe shape of the azimuthally varying coefficient A 4 for both horizontal and dipping reflectors. Whereas the magnitude of A 4 on dip lines typically becomes small for dips exceeding 45°, nonhyperbolic moveout near...
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Journal Article
Published: 01 December 2014
Journal of Environmental and Engineering Geophysics (2014) 19 (4): 207–228.
... of diffractions with limited asymptotes and dispersion, and occasional minor stratification. We use these diffractions and moveout profiles to calculate relative dielectric permittivities between 17 and 27, values which suggest up to 30% volumetric water, and likely saturation within these over-consolidated...
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Journal Article
Journal: Geophysics
Published: 04 January 2013
Geophysics (2013) 78 (1): C11–C23.
... interpolated inside each layer. The iterative migration velocity analysis involves efficient linearized parameter updating designed to minimize the residual moveout in image gathers for all available reflection events. The moveout equation in the depth-migrated domain includes a nonhyperbolic term...
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Journal Article
Journal: Geophysics
Published: 23 May 2011
Geophysics (2011) 76 (3): WA3–WA11.
... ; McMechan, 1983 ; Whitmore, 1983 ). It provides a natural way to deal with large lateral velocity variations and imposes no dip limitations on the images. The adoption of wide-azimuth (WAZ) data acquisition provides better subsurface illumination and more azimuthal information ( Etgen, 2006 ), which...
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Journal Article
Journal: Geophysics
Published: 27 February 2015
Geophysics (2015) 80 (2): U1–U12.
... multiparameter common image gathers through depth migration. Each gather associated with this system comprised dip-dependent opening-angle images contributed from the prestack data. Independent moveout information, coming from either a specular or nonspecular dip direction, was extracted inside these gathers...
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Journal Article
Journal: Geophysics
Published: 29 December 2006
Geophysics (2007) 72 (1): S41–S48.
... this residual moveout into velocity updates ( Fowler, 1985 ; Al-Yahya, 1989 ). The process can be applied iteratively, thus generating a loop between migration, MVA, and velocity updates, which terminates when the residual moveout is sufficiently flattened. The initial concepts soon led to a wide range...
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