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Evaluating the Benefit of Pressure-plus-gradient Reconstruction of Time-lapse Seismic Wavefields
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011, May 2011, cp-238-00312
- ISBN: 978-90-73834-12-5
Abstract
The repeatability of time-lapse seismic data depends upon the repeatability of the acquisition geometry. Despite the availability of high precision navigation systems and steerable streamers, matching seismic survey geometries can require spatial over-sampling and/or wavefield interpolation. Horizontal gradients of the pressure wavefield could greatly alleviate the cross-line sampling issue by doubling the cross-line wavenumber. This paper explores the benefit of using gradients in the reconstruction of pressure wavefields and finds that the reconstruction errors up to twice the pressure-only Nyquist frequency are well within acceptable time-lapse bounds. The use of a multi-channel interpolation by matching pursuit algorithm, in particular, offers good promise for higher order de-aliasing beyond twice-Nyquist.