Shear Waves in Streamer Data via Nongeometrical Conversions

Conference paper (2012)
Department
Geoscience & Engineering (CEG) (TU Delft)
Copyright: © 2012 The Author(s)
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Published Date

04-06-2012

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Source:

74th EAGE Conference & Exhibition incorporating SPE EUROPEC 2012, Copenhagen, Denmark, 4-7 June 2012

Faculty

Civil Engineering and Geosciences

Department

Geoscience & Engineering

Abstract

In this paper we show that when an airgun source and a hydrophone streamer are situated in the vicinity of the water bottom, shear-related events are generated via the evanescent part of the P wave in the water. The shear-related events are not only the often-used surface/Scholte waves but also body Swaves which can be reflected/refracted in the subsurface. The gain of this approach that neither source nor receiver is making any contact with the water bottom itself, making it possible to do shear-wave surveys on water in an efficient manner. We show that such shear-wave events are observed in real data, and can be reproduced by modelling. The results are further validated via real measurements in a borehole.

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