Preservation of high frequencies in wide‐aperture 3D VSP data from the Middle East

Goertz, A.; Chavarria, J. Andres; Paulsson, Björn; Karrenbach, Martin; Müller, Klaus W.; Al-Baloushi, Mariam; Marmash, Samer; Soroka, William L.

doi:10.1190/1.3064039

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2011

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“…The wavefields with such large incident angles are usually too complex to be separated. On the other hand, the VSP reflection signals with an incident angle larger than 45 o have large moveouts in the migrated image gathers, which in turn result in defocusing and loss of resolution and/or other artefacts in the final stacked image (Goertz et al . 2008).…”

Section: Methodsmentioning

confidence: 99%

A methodology to estimate the maximum offset and reflection imaging radius for a 2D/3D vertical seismic profiling survey

Liu

Williamson

Quinn

2011

Geophysical Prospecting

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A B S T R A C TWe have developed a straightforward and ray based methodology to estimate both the maximum offset and reflection imaging radius for multi-layered velocity models, which can be used for a 2D/3D VSP survey design. Through numerical examples, we demonstrate that the presence of a high-velocity layer above a target zone significantly reduces the maximum offset and reflection imaging radius. Our numerical examples also show that including in a migration VSP data acquired beyond a recommended maximum offset, radically degrades the quality of the final VSP image. In addition, unlike the conventional straight-line based approximation that often produces an incorrect large reflection imaging radius, our methodology predicts the VSP imaging radius with more accuracy than does the conventional approximation.

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Section: Methodsmentioning

confidence: 99%