Schlumberger

Technical Paper: Evaluating Fidelity and Repeatability of Wavefields Reconstructed from Multicomponent Streamer Data

Society: EAGE
Paper Number: E016
Presentation Date: 2012
 

Abstract

In marine time-lapse (4D) seismic data processing, each wavefield snapshot is usually interpolated onto a common grid to compensate for differences in acquisition, especially receiver, geometry. Because crossline sampling is usually sparse compared to inline sampling, and most mispositioning results from poor crossline repeatability from variable feathering, crossline interpolation is often aliased and causes 4D errors that increase with interpolation distance. Recent developments in multicomponent wavefield reconstruction hold promise for good amplitude fidelity, even for data that are spatially aliased to high order. In this paper we examine repeated data acquired by an experimental 3D-4C towed-cable array. Data from six crossline samples are reconstructed 1:12 and placed on a rectangular grid uniformly sampled at 6.25 m inline and crossline. Wavefields are interpolated using pressure alone and compared with wavefields reconstructed from pressure, crossline gradient and vertical gradient. We find that 3C reconstruction has excellent fidelity, recapturing highly aliased diffractions which are lost by pressure-only interpolation. 3C reconstruction is also more repeatable, outperforming 1C reconstruction, where error correlates with midpoint mispositioning. Although the experimental 3D data have limited inline aperture, the level of repeatability achieved is extremely encouraging compared to full-aperture, pressure-only, 4D datasets at an equivalent stage of processing.

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