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PZ Processing of a Signal-Apparition Triple-Source Field Test in the North SeaNormal access

Authors: K. Eggenberger, J.O.A. Robertsson, F. Andersson, D. van Manen, Å.S. Pedersen, L. Amundsen, K. Haavik, M. Thompson and O. Solheim
Event name: 80th EAGE Conference and Exhibition 2018
Session: Simultaneous Source - Acquisition and Processing
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800639
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 956.18Kb )
Price: € 20

We present results from a triple-source signal apparition-style field test carried out over a PRM array in the North Sea during the summer of 2017. In addition to the triple-source line, two reference lines were acquired firing the central source only. Assessing the quality of acoustic and elastic P/Z combination confirms high fidelity data quality throughout the bandwidth of the data. Comparing prestack migrated images of elastic P/Z combination against Amundsen demultiple images shows that multiples are a significant challenge in the area and that removing all surface related multiples as done in the Amundsen demultiple method is critical for unambiguous interpretation. Amundsen demultiple requires the deconvolution of the downgoing wavefield from the upgoing wavefield. Thus, the process relies on excellent data fidelity in separated wavefield constituents. We find that comparisons of reference line on reference line display a similar level of residual as the reference line compared to the isolated source result corresponding to the same source location. The reference line compared to the decoded source result corresponding to the other offset source locations display a larger residual. Our results thus confirm that triple-source signal apparition-style acquisition enables highly productive acquisition of seismic data without compromising on data quality.

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