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Optimization of the Streamer Shape in Variable-depth Streamer Acquisitions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013, Jun 2013, cp-348-01033
- ISBN: 978-90-73834-48-4
Abstract
Variable-depth streamer acquisition is an acquisition technique aiming at achieving the best possible signal-to-noise ratio at low frequencies by towing the streamer very deeply, but by using a depth profile varying with offset in order not to limit the high frequency bandwidth. In this paper we describe the methodology used to optimize the streamer depth profile for each variable-depth survey. The aim of the streamer profile is to ensure maximum notch diversity after imaging, thus ensuring the best possible pre- and post-stack deghosting. We first describe how a stretch effect affects the shape of the receiver ghosts in the migrated domain. Then a methodology based on synthetic modeling and imaging in a 1D velocity model is described in order to assess the suitability of a streamer depth profile to achieve broadband imaging of reflectors situated in the range of interest for the survey.