Proficient subsalt monitoring with 3D well seismic, deep-offshore West Africa

Gerea, Constantin; Pichon, P.L.; Geddes, Gary; Verliac, M.; Lesnikov, Vladislav

doi:10.1190/segam2016-13869509.1

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…Although sub‐horizontal sediments are clearly seen outside the salt, the structures are not well determined within the white oval under the salt canopy, and it is unclear whether what we see is real or artefacts related to the salt body or complex multiples inside the salt (from Gerea et al . (2016)).…”

Section: Applicationmentioning

confidence: 99%

“…Figure 1 shows a seismic image obtained from a three‐dimensional (3D) surface seismic field data acquired over and around a complex salt dome (Gerea et al ., 2016). Although sub‐horizontal sediments are clearly seen outside the salt, the structures are not well determined under the salt canopy, and it is unclear whether what one sees is real or artefacts related to converted shear, or complex multiples inside or outside the salt.…”

Section: Applicationmentioning

confidence: 99%

“…Total SA had generated a fully elastic 3C synthetic 3D VSP data set (Gerea et al ., 2016), in order to investigate whether the VSP geometry allows the determination of formation structure under complex salt overhangs. The work described in this present paper partially predates and did support the work reported by Haldorsen et al .…”

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: Applicationmentioning

confidence: 99%

Section: Applicationmentioning

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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“…In this paper, the JMI algorithm is demonstrated on the full wavefield of 3D borehole data including the down-going wavefield such that the expected value of acquiring 3D VSP data (see e.g. Gerea et al, 2016) will be even more increased.…”

Section: Introductionmentioning

confidence: 99%

Joint Migration Inversion of 3D Full Wavefield Borehole Data

Marhfoul

Verschuur

2017

Proceedings

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Summary3D borehole-related seismic data can provide us with accurate velocity models and high-resolution images. However, conventional imaging algorithms that assume primary reflection energy will cover only a limited area around the borehole. This illumination problem can be overcome by including surface-related and internal multiples in the imaging algorithm to enhance the illumination of the subsurface and image areas that are beyond the coverage of primary reflections. The industry standard for 3D borehole imaging is to use the first breaks to update the velocity model and consider only the primary reflections for imaging. It has been demonstrated that multiple scattering and the down-going wavefield can tremendously extend the imaging area around the borehole. Moreover, primary and multiple scattering contain valuable and crucial information that can enable us to update the velocity model beyond the coverage area of the first arrivals.In this paper we have employed the full wavefield of the 3D borehole data -containing all order scattering in both up/ down-going wavefields -in one integrated inversion-imaging process as proposed by the joint migration inversion methodology. The final result is a smooth accurate background velocity model along with a true amplitude reflectivity high-resolution image with and maximum lateral extent.

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Achieving business value using high-end borehole geophysics: Are we there yet?

Hornby

2017

SEG Technical Program Expanded Abstracts 2017

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Proficient subsalt monitoring with 3D well seismic, deep-offshore West Africa

Cited by 7 publications

References 1 publication

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

Joint Migration Inversion of 3D Full Wavefield Borehole Data

Achieving business value using high-end borehole geophysics: Are we there yet?

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