Using 3D finite‐difference modeling to design wide azimuth surveys for improved subsalt imaging

Regone, Carl

doi:10.1190/1.2370127

Cited by 49 publications

(25 citation statements)

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“…FD methods have been widely used for seismic modeling of different geological settings (e.g. Alaei & Petersen, 2007;Regone, 2007).…”

Section: Direct Methodsmentioning

confidence: 99%

“…Subsalt imaging has been a challenge for exploration seismology for many years and the application of seismic modeling has considerably improved the acquisition survey design for subsalt imaging (e.g. Regone, 2007). The modeling studies showed that wide angle azimuth acquisition surveys provide better illumination from subsalt structures.…”

Section: Applications In Seismic Acquisitionmentioning

confidence: 99%

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Seismic Modeling of Complex Geological Structures

Alaei¹

2012

Seismic Waves - Research and Analysis

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“…FD methods have been widely used for seismic modeling of different geological settings (e.g. Alaei & Petersen, 2007;Regone, 2007).…”

Section: Direct Methodsmentioning

confidence: 99%

Section: Applications In Seismic Acquisitionmentioning

confidence: 99%

Seismic Modeling of Complex Geological Structures

Alaei¹

2012

Seismic Waves - Research and Analysis

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“…In the way PERM is formulated there is no restriction on the dimensionality of the pre-stack image used as the initial condition for the modeling, which means that if the original data have sufficient cross-line offsets as in the acquisition geometries with wide range of azimuths (Regone, 2007;Kapoor et al, 2007;Moldoveanu et al, 2008), the initial conditions are a five-dimensional hypercube on x, h x and h y .…”

Section: D-perm From Common-azimuth Migrated Imagesmentioning

confidence: 99%

Migration-velocity Analysis Using Image-space Generalized Wavefields

Cardoso¹,

Biondi²

2011

73rd EAGE Conference and Exhibition Incorporating SPE EUROPEC 2011

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An accurate depth-velocity model is the key for obtaining good quality and reliable depth images in areas of complex geology. In such areas, velocity-model definition should use methods that describe the complexity of wavefield propagation, such as focusing and defocusing, multiple arrivals, and frequency-dependent velocity sensitivity. Wave-equation tomography in the image space has the ability to handle these issues because it uses wavefields as carriers of information. However, its high cost and low flexibility for parametrizing the model space has prevented its routine industrial use.This thesis aims at overcoming those limitations by using new wavefields as carriers of information: the image-space generalized wavefields. These wavefields are synthesized by using a pre-stack generalization of the exploding-reflector model. Cost of wave-equation tomography in the image space is decreased because only a small number of image-space generalized wavefields are necessary to accurately describe the kinematics of velocity errors and because these wavefields can be easily used in a target-oriented way. Flexibility is naturally incorporated into wave-equation tomography in the image space by using these wavefields because their modeling have as the initial conditions some key selected reflectors, allowing a layer-based parametrization of the model space.To use the image-space generalized wavefields in wave-equation tomography in the image space, the method is extended from the shot-profile domain to the image-space generalized-sources domain. In this new domain, the velocity updates are very fast. ER denotes Easily Reproducible and are the results of processing described in the paper. The author claims that you can reproduce such a figure from the programs, parameters, and makefiles included in the electronic document. The data must either be included in the electronic distribution, be easily available to all researchers (e.g., SEG-EAGE data sets), or be available in the SEP data library 2 . We assume you have a UNIX workstation with Fortran, Fortran90, C, X-Windows system and the software downloadable from our website (SEP synthetic data examples associated with this report are classified as NR because they were generated externally to SEP and only the results were released by agreement.Our testing is currently limited to LINUX 2.6 (using the Intel Fortran90 I thank Biondo Biondi, my adviser, for always being a source of encouragement and a reference on academic honesty. His attitude made clearer to me both the importance of obtaining good results and the usefulness of the bad ones, which deserve to be brought to light. I thank Jon Claerbout for initiating us students into the mysteries of inverse problems and for sharing his contagious enthusiasm for doing research. I admire his energy, curiosity, and serendipity. Bob Clapp has constantly been steps ahead of everyone in looking for computational solutions that best fit the type and size of geophysical problems we propose to solve. Also, his knowledge about ...

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“…A recent development in wave-equation imaging is the use of wide-azimuth data (Regone, 2006;Michell et al, 2006;Clarke et al, 2006). Imaging with such data poses additional challenges for angle-domain imaging, mainly arising from the larger data size and the interpretation difficulty of data of higher dimensionality.…”

Section: Introductionmentioning

confidence: 99%

Wide-azimuth angle gathers for wave-equation migration

Sava

Vlad

2011

GEOPHYSICS

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Extended common-image-point-gathers (CIP) contain all the necessary information for decomposition of reflectivity as a function of the reflection and azimuth angles at selected locations in the subsurface. This decomposition operates after the imaging condition applied to wavefields reconstructed by any type of wideazimuth migration method, e.g. using downward continuation or time reversal. The reflection and azimuth angles are derived from the extended images using analytic relations between the space-lag and time-lag extensions. The transformation amounts to a linear Radon transform applied to the CIPs obtained after the application of the extended imaging condition. If information about the reflector dip is available at the CIP locations, then only two components of the space-lag vectors are required, thus reducing computational cost and increasing the affordability of the method. Applications of this method include the study of subsurface illumination in areas of complex geology where ray-based methods are not usable, and the study of amplitude variation with reflection and azimuth angles if the subsurface subsurface illumination is sufficiently dense. Migration velocity analysis could also be implemented in the angle domain, although an equivalent implementation in the extended domain is cheaper and more effective.

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Using 3D finite‐difference modeling to design wide azimuth surveys for improved subsalt imaging

Cited by 49 publications

References 1 publication

Seismic Modeling of Complex Geological Structures

Seismic Modeling of Complex Geological Structures

Migration-velocity Analysis Using Image-space Generalized Wavefields

Wide-azimuth angle gathers for wave-equation migration

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