Fundamentals of frequency domain migration

Chun, J. H.; Jacewitz, Chester A.

doi:10.1190/1.1441211

Cited by 112 publications

(12 citation statements)

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“…When applying multidimensional Fourier transforms, such as from (t, x) to (f, ), linear events in the original domain will also be linear events in the transformed domain, except that the orientations of each event in the two domains are perpendicular to each other [6]. If there are linear noises, or if there are noises with dip (offset or time) less than a certain angle, such as ground rolls, we can mute such noise in the F-Kdomain, and then transfer the remaining data back to the t-x domain.…”

Section: Velocity Filter ( Dip Filter)mentioning

confidence: 99%

Processing Seismic Data with Open Source Software

Al-Rahim¹,

Terky²

2017

IJAERS

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Abstract-open source seismic processing softwares provides a low cost alternative to commercial softwares and, with an appropriately directed development, an ability to adapt to the changing research needs. The best known example of such kind is Seismic Unix, a free reflection processing system developed at the Colorado School of Mines. It has been broadly used in research and teaching seismology and also in smaller scale seismic processing industry. Through this paper the seismic Unix was tested for the first time at Iraqi academic system by processing a real seismic data acquired at northern Iraq at Basra province. The test done by reliance a simple processing flow and the result show us high resolution seismic section and less noise ratio. According to the early mentioned results the seismic Unix recommended as a teaching tool for Iraqi educational system.

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Section: Velocity Filter ( Dip Filter)mentioning

confidence: 99%

Processing Seismic Data with Open Source Software

Al-Rahim¹,

Terky²

2017

IJAERS

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“…Note that, even though both modeling and remigration are carried out by finite-difference methods, the applied techniques are different. These data correspond to a time migration with migration velocity u = 0.0 m/s (Chun and Jacewitz, 1981). These are different partial differential equations describing the completely different kinematic (and dynamic) behaviour of the underlying problems.…”

Section: Numerical Examplesmentioning

confidence: 99%

Vertical image waves in elliptically anisotropic media

2008

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By reparameterization of the kinematic expressions for remigration in elliptically anisotropic media using a new ellipticity parameter, we derive a new image-wave equation in elliptically anisotropic media describing the position of the reflector as a function of the medium ellipticity. This image wave equation, which is a kind of mediumdependent one-way wave equation, can be used for automatically stretching a timemigrated image in depth until wells are tied or other given geologic criteria are met. In this way, it provides a useful means to use a priori depth information for finding an estimate of the vertical velocity, which cannot be detected from time processing only. Simple numerical examples confirm the validity of the image-wave equation even for nonconstant velocity. K e y w o r d s : velocity analysis, velocity continuation, image waves, remigration, elliptic anisotropy, vertical stretch

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“…Horizontal and vertical displacements are given by the following formulae (Chun and Jacewitz, 1981):…”

Section: Migration Aperture and Migration Displacementsmentioning

confidence: 99%

3-D Land Seismic Surveys: Definition of Geophysical Parameter

Chaouch¹,

Mari²

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Sismique 3D terrestre : définition des paramètres d'acquisition -Dans la plupart des compagnies pétrolières, les acquisitions sismiques marines 3-D ont augmenté de façon exponentielle entre 1990 et 1996 pour couvrir la majorité de leurs champs. Aujourd'hui, la sismique 3-D est de plus en plus utilisée aussi en terrestre. Des outils spécifiques de pré-planning ont été développés pour déterminer les principales caractéristiques de la future acquisition 3-D tels que le degré de couverture, les distributions d'offsets et d'azimuths, les effets des obstacles de surface, etc. Les études de pré-planning ont pour but de définir les paramètres géophysiques associés aux objectifs géologiques ainsi que les dispositif 3-D à mettre en oeuvre et les coûts. Le présent article introduit la terminologie utilisée dans la technologie 3-D et passe en revue les principaux paramètres de cette technologie. La première partie est un glossaire illustré. La seconde partie offre aux géophysiciens d'étude les outils qui permettent d'évaluer rapidement les paramètres géophysiques d'une acquisition 3-D, évaluation basée sur les principes fondamentaux de la propagation des ondes. De plus, elle donne des règles pratiques, souvent présentées sous forme de règles du pouce. Abstract -3-D Land Seismic Surveys: Definition of Geophysical Parameters

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Fundamentals of frequency domain migration

Abstract: Frequency domain migration is founded upon the wave equation, and so includes diffractions and other effects. This paper seeks to motivate and illuminate frequency domain migration using straightforward geometric techniques and simple frequency domain observations.

Cited by 112 publications

References 0 publications

Processing Seismic Data with Open Source Software

Processing Seismic Data with Open Source Software

Vertical image waves in elliptically anisotropic media

3-D Land Seismic Surveys: Definition of Geophysical Parameter

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