Simulated migration amplitude for improving amplitude estimates in seismic illumination studies

Laurain, Renaud; Vinje, Vetle; Strand, Christian

doi:10.1190/1.1690896

Cited by 15 publications

(6 citation statements)

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“…A brightening and dimming effect towards the fault was witnessed in the seismic amplitudes analysis of this paper. Variations in seismic amplitude near fault planes can be related to seismic signal focusing, changes in acoustic properties, and/or illumination effects from seismic acquisition (Badley, 1985;Sheriff and Geldart, 1995;Laurain et al, 2004;Couples et al, 2007;Skurtveit et al, 2013), all of which are potentially related to the structural geometry…”

Section: Discussionmentioning

confidence: 99%

“…However, without access to well cores or logs of these rocks, it is not possible to prove if this correlation exists. c. Survey Geometry/ Illumination mapping -The seismic data are controlled by the geometry and acquisition direction of the seismic survey (Laurain et al, 2004;Drottning et al, 2006;Gjøystdal et al, 2007). Several studies document that illumination direction also has an effect on the measured seismic amplitudes especially with respect to faults (Drottning et al, 2006;Gjøystdal et al, 2007;Lecomte, 2008;Botter et al, 2014Botter et al, , 2016Lecomte et al, 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Fault deformation, seismic amplitude and unsupervised fault facies analysis: Snøhvit Field, Barents Sea

Cunningham

Cardozo

Townsend

et al. 2019

Journal of Structural Geology

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We present an integrated seismic imaging and fault interpretation workflow to characterize the seismic expression in and around an E-W trending central fault system imaged in nearangle stack seismic data of the Snøhvit Field, Barents Sea. Three E-W normal fault systems offset five Triassic-Lower Cretaceous seismic horizons across the field. Fault throw is largest at depth and decreases with shallowing. Dip distortion (DD) decreases in magnitude and extent with shallowing. Fault enhancement (FE), a filter used to detect edges, was applied on a blend of tensor, semblance and dip attributes, and allowed us to classify fault zones into four unsupervised seismic fault facies (mid-high FE). High FE facies occur at the center of the fault zones and are abundant in the highest thrown eastern part of the field. The FE facies decrease radially outwards field wide. Facies correlate with throw and dip separation gradient, which are in turn related to mechanical stratigraphy controlling fault propagation. We observe systematic seismic amplitude variations: a major amplitude drop on the fault plane, and a brightening and dimming linked to fault-related synclines and anticlines, respectively. Our workflow establishes a methodology for fault interpretation, linking fault throw, DD, seismic attributes and fault facies classification.

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Section: Discussionmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Fault deformation, seismic amplitude and unsupervised fault facies analysis: Snøhvit Field, Barents Sea

Cunningham

Cardozo

Townsend

et al. 2019

Journal of Structural Geology

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“…Amplitude profiles corresponding to PP and PS reflections, for the complete prestack depth migration and the migration simulation method, are shown in Figure 11. For comparison, the result of a conventional illumination analysis ͑e.g., Sassolas et al, 1999;Bear et al, 2000;Laurain, 2004b͒ is also included. The curves for the simulated amplitude ͑red͒ and the complete PSDM amplitude ͑green͒ are very consistent, whereas the illumination amplitude ͑blue͒ is typically higher and lower, respectively, at crests and valleys of the target reflector.…”

Section: Sm266 Gjøystdal Et Almentioning

confidence: 97%

“…However, this is a time-consuming and cumbersome process, especially as making a change in the model or survey geometry requires another full loop of that modeling/processing workflow. Reducing such costs was the motivation for developing the simulated migration amplitude method ͑Figure 2͒, which is described in some detail in Laurain et al ͑2004b͒.…”

Section: Simulating the Migration Amplitude On A Local Surface Elementmentioning

confidence: 99%

Improved applicability of ray tracing in seismic acquisition, imaging, and interpretation

et al. 2007

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Ray-based seismic modeling methods can be applied at various stages of the exploration and production process. The standard ray method has several advantages, e.g., computational efficiency and the possibility of simulating propagation of elementary waves. As a high-frequency approximation, the method also has a number of limitations, particularly with respect to a lack of amplitude reliability in the presence of rapid changes of the model functions representing elastic parameters and interfaces. Given the objective of improving the applicability of the standard ray method, we present a strategy that does not require specific extension to finite frequencies. Instead, we define each ray-based process as an element of a system that, as a composite process, is able to obtain better results than the ray-based process applied alone. Other elements of the composite process can be finitedifference modeling or numerical solutions for surface and volume integrals, which are basic constituents of Kirchhoff modeling and imaging. We also include among the process elements recently developed techniques for simulating the migration amplitude on a target reflector and in a local volume, e.g., a reservoir zone. The model is decomposed according to its complexity into volume elements, surface elements, or a combination. The composite process consists of a specified interaction between process elements and model elements, which fits well with the philosophy of modern software design. Model elements that will be exposed to ray-tracing algorithms may need appropriate preparation, e.g., smoothing and resampling. We demonstrate specifically, in a tutorial example, that simulating the seismic response from a reflector by ray-based composite processes can yield better results than applying standard ray tracing alone.

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“…By using ray-tracing technology, we are able to simulate migration amplitudes across the target horizon. This process is a target orientated, Kirchhoff migration of synthetic data around the reflection points using the local paraxial approximation of the two-way traveltime field on the target horizon (Laurain et al, 2004). For the purpose of this study, this process allows us to rapidly and accurately quantify the target response to the various acquisition geometries that we simulate, giving us a clear indication of which geometries best overcome the challenges in the overburden.…”

Section: Illumination Analysismentioning

confidence: 99%

Investigating the impact of acquisition design on the problem of imaging below shallow gas

Branston¹,

Tham²,

Priasati³

2012

ASEG Extended Abstracts

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Simulated migration amplitude for improving amplitude estimates in seismic illumination studies

Cited by 15 publications

References 0 publications

Fault deformation, seismic amplitude and unsupervised fault facies analysis: Snøhvit Field, Barents Sea

Fault deformation, seismic amplitude and unsupervised fault facies analysis: Snøhvit Field, Barents Sea

Improved applicability of ray tracing in seismic acquisition, imaging, and interpretation

Investigating the impact of acquisition design on the problem of imaging below shallow gas

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