Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Hugh D. Geiger"'
Publikováno v:
GEOPHYSICS. 71:S111-S120
We present a new approach to the design and implementation of explicit wavefield extrapolation for seismic depth migration in the space-frequency domain. Instability of the wavefield extrapolation operator is addressed by splitting the operator into
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c91fbc457813a6437c50d74aa61f0d5f
https://doi.org/10.1190/1.2196034
https://doi.org/10.1190/1.2196034
Autor:
Hugh D. Geiger, Frederick A. Cook
Publikováno v:
Canadian Journal of Earth Sciences. 38:953-961
Application of bandpass and directional filtering to potential-field data in northwestern Canada allows separation of anomalies due to northwest-oriented upper crustal sources that are associated with Cordilleran structures from anomalies due to nort
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d1ab0c2037feffe7ea1540293bdacbe
https://doi.org/10.1139/e00-109
https://doi.org/10.1139/e00-109
Publikováno v:
GEOPHYSICS. 64:197-207
Fourier prestack migration is reformulated through a change of variables, from offset wavenumber to a new equivalent wavenumber, which makes the migration phase shift independent of horizontal wavenumber. After the change of variables, the inverse Fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f3acdc463dad37199ae4744cd5df621
https://doi.org/10.1190/1.1444516
https://doi.org/10.1190/1.1444516
Publikováno v:
GEOPHYSICS. 63:2042-2053
A prestack time migration is presented that is simple, efficient, and provides detailed velocity information. It is based on Kirchhoff prestack time migration and can be applied to both 2-D and 3-D data. The method is divided into two steps: the firs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ad70119b9fad40411b25a0799dcebf2
https://doi.org/10.1190/1.1444497
https://doi.org/10.1190/1.1444497
Autor:
Sheng Xu, John Etgen, Martin Tygel, David Lumley, Herman Jaramillo, Jos van Trier, Nick Bernitsas, Gary F. Margrave, Dave Nichols, James Sun, Jörg Schleicher, Pascal Podvin, Ray Abma, Samuel H. Gray, William P. May, Peter Hubral, Antonio Pica, N. Ross Hill, Jon F. Claerbout, John C. Bancroft, Uwe Albertin, Robert Bloor, William W. Symes, Walter Rietveld, Gilles Lambaré, Rusty Alford, Hugh D. Geiger, Mark Noble, Norman Bleistein, Hervé Chauris, Dimitri Bevc, Dave Yingst
Publikováno v:
Prestack Depth Migration and Velocity Model Building
Prestack Depth Migration and Velocity Model Building, Society of Exploration Geophysicists, pp.77-224, 2008, ⟨10.1190/1.9781560801917.ch3⟩
Prestack Depth Migration and Velocity Model Building, Society of Exploration Geophysicists, pp.77-224, 2008, ⟨10.1190/1.9781560801917.ch3⟩
International audience
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b59bfa476b36fe1d1b898258b1935e81
https://hal.archives-ouvertes.fr/hal-02409010
https://hal.archives-ouvertes.fr/hal-02409010
Autor:
Hugh D. Geiger, Gary F. Margrave
Publikováno v:
SEG Technical Program Expanded Abstracts 2005.
Wave equation depth migration methods such as phaseshift plus interpolation, extended split-step Fourier, or Fourier finite difference plus interpolation, require a limited set of reference velocities for efficient wavefield extrapolation through lat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67b6b4e20d2f28160c0f97842cbb685d
https://doi.org/10.1190/1.2148115
https://doi.org/10.1190/1.2148115
Publikováno v:
SEG Technical Program Expanded Abstracts 2005.
We present a new approach to the design of stable and accurate wavefield extrapolation operators needed for explicit depth migration. We split the theoretical operator into two component operators, one a forward operator that controls the phase accur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d79a292a39109b8119f52f2ffac2bd5d
https://doi.org/10.1190/1.2148062
https://doi.org/10.1190/1.2148062
Publikováno v:
SEG Technical Program Expanded Abstracts 2004.
Summary Recursive wavefield extrapolation has attractive merits that make it an ideal candidate for implementation in prestack depth migrations. However, the artifacts resulting from data and operator aperture truncations may cause instability and in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90d99d0d03641ef92964201717fe1419
https://doi.org/10.1190/1.1845327
https://doi.org/10.1190/1.1845327
Autor:
Hugh D. Geiger
Publikováno v:
SEG Technical Program Expanded Abstracts 2003.
In a ‘Kirchhoff’ (i.e. weighted diffraction stack) prestack migration, the summation over a complete diffraction surface can be thought of as an average of reflectivity estimates from migrated common-shot, common-receiver or common-offset gathers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8e2e7d9a9e69eb87cde93e398b4d96c
https://doi.org/10.1190/1.1817650
https://doi.org/10.1190/1.1817650
Autor:
Hugh D. Geiger
Publikováno v:
SEG Technical Program Expanded Abstracts 2002.
Summary In a ‘Kirchhoff’ (i.e. weighted diffraction stack) prestack migration, the summation over a complete diffraction surface can be thought of as an average of reflectivity estimates from migrated common-shot, common-receiver or common -offse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fcdcc7082bbbc42551cc9f7cdf984558
https://doi.org/10.1190/1.1816872
https://doi.org/10.1190/1.1816872