A Migration Approach to Generating Continuous Images of Salt and Sediment Boundaries from Multi-Offset VSP Data

Haldorsen, J.; Brooks, N.; Donais, Pat; Heigl, Werner M.; Li, Fred

doi:10.1190/sbgf2015-204

Cited by 3 publications

(7 citation statements)

References 6 publications

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“…This process was developed further by Haldorsen et al . (2015) and Haldorsen and Jahren (2020). The next paragraphs summarize this work, for simplicity of arguments – replacing the general Green's propagators by a time‐delay or a time‐advance operator.…”

Section: Imaging With Vector Datamentioning

confidence: 99%

“…We then summarize the ray‐based vector migration process for three‐component data, based on Haldorsen (2002), Haldorsen et al . (2013, 2015), and Haldorsen and Jahren (2020), as pertaining to general imaging with Vertical Seismic Profiling data, using semblance‐weighted deconvolution in the imaging condition. This ray‐based formulation, including explicit use of particle‐motion polarization to establish whether a specific component of the wavefield could possibly originate – or be reflected, converted or refracted – at a specific point in the three‐dimensional volume is under investigation.…”

Section: Imaging With Vector Datamentioning

confidence: 99%

“…Haldorsen et al . (2015) argue that the resolution is increased by replacing the wavefield correlation with the deconvolution. They use the inherently stable semblance‐weighted deconvolution (or ‘energy‐weighted correlation') operator from equation ().…”

Section: Imaging With Vector Datamentioning

confidence: 99%

“…Haldorsen et al . (2015) apply vector‐migration to the problem of locating salt interfaces from a field VSP data set. However, there was no real possibility to assert that the image obtained from these data were consistent with the true formation.…”

Section: Applicationmentioning

confidence: 99%

“…The work described in this present paper partially predates and did support the work reported by Haldorsen et al . (2013, 2015), Haldorsen and Jahren (2019, 2020), but was not cleared for publication until recently. Their work demonstrates that vector migration when applied to field data create reasonably looking images.…”

Section: Introductionmentioning

confidence: 99%

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Imaging complex three‐dimensional structures, applying three‐component vector migration to synthetic vertical seismic profiling data

Haldorsen

Jahren

2021

Geophysical Prospecting

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By applying a ray‐based three‐dimensional vector migration process to fully elastic three‐component synthetic Vertical Seismic Profiling data, we are able to demonstrate that the process gives an accurate compressional reflection image of the complex formation without much visible artefacts from spatial aliasing, or from ‘migration smiles’ caused by the limited aperture of the receiver array. We demonstrate that the process reconstructs images of both steeply dipping salt flanks, and the sediments that tend to be dragged along by the moving salt and truncated against the sides of the salt body. The process uses raw unseparated data as input, and the wavefield separation of compressional and shear waves are done by projection operators inside the kernel of the migration process. The compressional reflection image appear to have no visible artefacts from the abundance of converted shear.

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Section: Imaging With Vector Datamentioning

confidence: 99%

Section: Imaging With Vector Datamentioning

confidence: 99%

Section: Imaging With Vector Datamentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Imaging complex three‐dimensional structures, applying three‐component vector migration to synthetic vertical seismic profiling data

Haldorsen

Jahren

2021

Geophysical Prospecting

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Imaging below a complex overburden with borehole-seismic data

Haldorsen

Jahren²

2020

GEOPHYSICS

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We have determined how the measured polarization and traveltime for P- and S-waves can be used directly with vertical seismic profile data for estimating the salt exit points in a salt-proximity survey. As with interferometry, the processes described use only local velocities. For the data analyzed in this paper, our procedures have confirmed the location, inferred from surface-seismic data, of the flank of a steeply dipping salt body near the well. This has provided us more confidence in the estimated reservoir extent moving toward the salt face, which in turn has added critical information for the economic evaluation of a possible new well into the reservoir. We also have found that ray-based vector migration, based on the assumptions of locally plane wavefronts and locally plane formation interfaces, can be used to create 3D reflection images of steeply dipping sediments near the well, again using only local velocities. Our local reflection images have helped confirm the dips of the sediments between the well and the salt flank. Because all parameters used in these processes are local and can be extracted from the data themselves, the processes can be considered to be self-sufficient.

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Multicomponent and source-free converted-wave reverse time migration for VSP

Yang

et al. 2018

SEG Technical Program Expanded Abstracts 2018

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A Migration Approach to Generating Continuous Images of Salt and Sediment Boundaries from Multi-Offset VSP Data

Cited by 3 publications

References 6 publications

Imaging complex three‐dimensional structures, applying three‐component vector migration to synthetic vertical seismic profiling data

Imaging complex three‐dimensional structures, applying three‐component vector migration to synthetic vertical seismic profiling data

Imaging below a complex overburden with borehole-seismic data

Multicomponent and source-free converted-wave reverse time migration for VSP

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