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Compensating for the effects of gas clouds on C-wave imaging : a case study from Valhall

Li, Xiang-Yang; Dai, Hengchang; Mueller, Michael C.; Barkved, Olav I.. 2001 Compensating for the effects of gas clouds on C-wave imaging : a case study from Valhall. The Leading Edge, 20 (9). 1022-1028. 10.1190/1.1487307

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Abstract/Summary

P-to-S converted waves (or C-waves) have been successfully used to image beneath gas clouds in many areas. However, C-waves often suffer from severe diodic effects due to the gas clouds; that is, the C-wave amplitude and traveltime may be different in the forward and reverse shooting directions, giving rise to different C-wave stacking velocities (diodic VC) and velocity ratios (diodic γeff). In some cases, whether a horizon (a geologic target) beneath a gas cloud can be undershot also depends on the shooting directions (diodic illumination). These effects, compounded with the asymmetric raypath of the C-wave and the uncertainties in the P-wave data due to the gas clouds, will further increase the difficulties and costs of processing C-wave data. In this article, using the 2-D Valhall data as an example, we examine these effects and discuss ways to compensate for them during processing for improving the C-wave imaging.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1190/1.1487307
Programmes: BGS Programmes > Seismology and Geomagnetism
Date made live: 11 Oct 2012 11:02
URI: http://nora.nerc.ac.uk/id/eprint/19927

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