True‐amplitude CRS‐based Kirchhoff time migration for AVO analysis

Spinner, Miriam; ̈urgen, Mann J

doi:10.1190/1.2144311

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…In principle, this allows to correctly place the migration aperture in limited-aperture migration and to extract the CRS wavefield attributes defined at the stationary point. These attributes provide information on the aperture size and its behavior with varying offset and, thus, all information required to perform limited-aperture migration (see, e. g., Jäger, 2005a;Spinner and Mann, 2005).…”

Section: Discussionmentioning

confidence: 99%

Double diffraction stack for an alternative strategy for CRS-based limited-aperture Kirchhoff depth migration

Veile¹

2009

11th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009

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In Kirchhoff migration, the proper choice of the aperture is essential: the optimum aperture is the limited aperture defined by the first projected Fresnel zone. This is the smallest aperture providing interpretable amplitudes along with the highest possible S/N ratio and the minimum number of required summations. In addition, limited-aperture migration naturally prevents operator aliasing. The commonreflection-surface (CRS) stack provides kinematic wavefield attributes which allow to estimate the optimum aperture size for zero-offset and its dislocation with varying offset. The aperture is centered around the stationary point, but this point has to be associated with the corresponding point in the migrated domain in an additional process. Kirchhoff migration itself implicitly connects the stationary point and the image point in depth by collecting the energy in the vicinity of the former and assigning it to the latter. In principle, any smoothly varying property can be migrated "on top" of the seismic data themselves by applying multiple weighted diffraction stacks. The most generic property to be migrated in this way is the source/receiver midpoint which yields the lateral position of the stationary point mapped to the image location in depth. We investigate the validity and accuracy of this approach for simple synthetic data and apply it to a real land data set. A straightforward extension is introduced to solve some of the numerical problems inherent to this approach and CRSbased strategies are transferred from the time domain to the depth domain to identify the reflector images and to attenuate migration noise. Finally, the approach is compared to another CRS-based approach which directly evaluates the tangency criterion.

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Section: Discussionmentioning

confidence: 99%

Double diffraction stack for an alternative strategy for CRS-based limited-aperture Kirchhoff depth migration

Veile¹

2009

11th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009

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“…Jäger 2005successfully applied CRS wavefield attributes for minimum-aperture Kirchhoff depth migration. Spinner and Mann (2006) demonstrated that this concept can be transferred back to the time domain. Here, not only the sensitivity to velocity model errors is reduced, but also the migration velocity model building can be performed in a highly automated and simple way.…”

Section: Discussionmentioning

confidence: 99%

“…Jäger (2005) employed the CRS attributes in preand poststack Kirchhoff depth migration to estimate the size and location of the minimum migration aperture with the aim to reduce migration artifacts and to avoid operator aliasing. As depth migration is quite sensitive to velocity model errors and costly in terms of inversion, Spinner and Mann (2006) transfered the concept to the time domain. The focus of the time domain approach is to reduce migration artefacts and to provide an improved input for subsequent amplitude-versus-offset (AVO) analysis.…”

Section: Introductionmentioning

confidence: 99%

CRS-Based Minimum-Aperture Time Migration - A Real Data Example

Mann¹,

Kienast²,

Spinner³

2007

69th EAGE Conference and Exhibition Incorporating SPE EUROPEC 2007

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The achievable image quality and the reliability of amplitudes in Kirchhoff migration strongly depend on the selection of the migration aperture. Optimal amplitudes are obtained if the migration aperture is restricted to the constructively contributing part of the reflection event which is related to the size of the projected Fresnel zone. The Common-Reflection-Surface (CRS) stack provides kinematic wavefield attributes that allow to address this problem together with a straightforward time migration velocity model building. The approach is applied to a complex onshore data set and compared to conventional Kirchhoff migration. We observe an improved continuity of the reflection events as well as more stable amplitudes in regions with reliably detected CRS attributes. Moreover, the computational costs of the prestack migration are significantly reduced. Related presentations B044 CRS stacking: a simplified explanation, J. Mann, J. Schleicher, and T. Hertweck P058 Automatic tracking of reflection events in 3D ZO volumes using CRS attributes, N.-A. Müller H015 2D CO CRS poststack imaging for walkaway VSP data, M. von Steht

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“…In the following, the diffraction oriented CRS moveout, as well as any enhancement method based on it, will be simply referred to as modified CRS. The diffraction traveltime approximation based on modified CRS moveout is very well known for its use as a time‐migration operator (see, e.g., Spinner and Mann ). The diffraction enhancement technique proposed in this paper can be considered as an extension of our earlier work (Asgedom et al .…”

Section: Introductionmentioning

confidence: 99%

2D common‐offset traveltime based diffraction enhancement and imaging

Asgedom

Gelius

Tygel

2013

Geophysical Prospecting

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The diffracted energy in a seismic recording contains key information about small‐scale inhomogeneities or discontinuities of the subsurface. Diffractions can therefore lead to high‐resolution imaging of subsurface structures associated with hydrocarbon traps. However, seismic diffracted signals are often much weaker than specular reflections and consequently require enhancement before they can be utilized. In this paper diffractions are enhanced relative to reflections based on two traveltime techniques, namely the modified common‐reflection‐surface approach, which uses the common‐reflection‐surface technique with some modification to tailor it for diffractions and the replacement‐media approach derived here for the purpose of a simplified parametrization of diffraction traveltimes. Both approaches are implemented in the common‐offset domain with the use of a finite‐offset central ray unlike the zero‐ or small‐offset diffraction enhancement techniques that use a zero‐offset central ray. The validity of the two moveout expressions is tested using velocity data taken from a smooth isotropic Marmousi model. A feasibility test was also carried out with respect to the new replacement‐media traveltime approximation addressing the various effects of signal‐to‐noise ratio, depth and lateral displacement of the diffractor location. Finally, diffraction enhancement and imaging was performed on 2D seismic data from the Jequitinhonha basin offshore Brazil. Diffractions were significantly enhanced and a high‐resolution image of the discontinuities of the subsurface was obtained.

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True‐amplitude CRS‐based Kirchhoff time migration for AVO analysis

Cited by 8 publications

References 8 publications

Double diffraction stack for an alternative strategy for CRS-based limited-aperture Kirchhoff depth migration

Double diffraction stack for an alternative strategy for CRS-based limited-aperture Kirchhoff depth migration

CRS-Based Minimum-Aperture Time Migration - A Real Data Example

2D common‐offset traveltime based diffraction enhancement and imaging

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