Schlumberger

Technical Paper: On the Use of Frequency-Dependent Repeatability Metrics for Evaluating Wavefield Reconstruction: A Time-Lapse Perspective

Society: SEG
Paper Number: 792
Presentation Date: 2013
 

Abstract

The emergence of multisensor towed-marine streamers, with multichannel wavefield reconstruction, offers the prospect of true 3D processing, overcoming the spatial sampling constraint in the crossline direction associated with hydrophone-only acquisition. Time-lapse seismic data processing has developed a range of metrics to assess repeatability between different vintages and which can be used to assess the reconstruction quality of such algorithms. However, in most cases these metrics are applied in a frequency-independent fashion. With dealiased wavefield reconstruction being a core technique of multimeasurement seismic processing, such 4D metrics can be adapted to evaluate its performance in a frequency-dependent manner. Normalized root-mean-square and predictability metrics, defined in the frequency domain, provide tools to measure reconstruction quality. Our study of real data from the North Sea is tied to a time-lapse experiment investigating frequency-dependent repeatability on prestack gathers as well as 2D stacks. We also apply different configurations of the reconstruction algorithms to understand better the contribution of the individual measurements: pressure (P), the vertical (Z), and crossline (Y) accelerations. We find that multichannel reconstruction using all three input measurements considerably enhances repeatability against a measured benchmark in the higher frequency bands, both pre- and poststack on the total wavefield, with reconstruction using P and Y coming a close second.

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