--> 3D Multiple Elimination in the Gulf of Suez
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Previous Hit3DNext Hit Multiple Elimination in the Gulf of Suez: Acquisition Design for Optimum Processing Results

By

Ian M. Threadgold1, Norman C. Allegar1, Roald Gunnar van Borselen2, D.J. (Eric) Verschuur3, Ken H. Matson4

(1) BP Egypt, Maadi, Cairo, Egypt (2) PGS Geophysical, Walton-on-Thames, United Kingdom (3) Delft University of Technology, 2600 GA Delft, Netherlands (4) BP, Houston, TX

 The Gulf of Suez (GoS) is a very mature basin, and is acknowledged for the poor quality of the seismic Previous HitdataNext Hit. Free surface and interbed multiples are the most severe problems from a host of geophysical effects that mask primary events on GoS seismic Previous HitdataNext Hit.

BP Egypt established an in-country applied-research project (the GoS Demultiple Project) to identify, evaluate, develop and apply techniques to significantly improve seismic Previous HitdataNext Hit quality on a very timely basis, and to assure the continued development of a high quality prospect portfolio.

A 2D test program in 2001, provided zero-offset Previous HitdataNext Hit which gave substantial imaging improvements by allowing optimized application of 2D Surface-Related Multiple Elimination (SRME) software, in the relatively shallow water (~60m) GoS, in addition to further advancements such as low frequency adaptive subtraction.

Further work on source comparisons, and acquisition aspects, led to a novel Previous Hit3DNext Hit survey design for attenuating GoS multiples, with the prime tenet of acquiring Previous HitdataNext Hit that would meet the Previous Hit3DNext Hit sampling requirements of SRME algorithms.

The survey design includes:

·        An optimized source to emphasize the low-frequency primary bandwidth

·        A multi-azimuth component to aid in illumination and multiple removal

·        Near offset recording to provide pre-critical Previous HitdataNext Hit for SRME, and

·        Adequately sampling the multiples in Previous Hit3DNext Hit for application of full Previous Hit3DNext Hit and sparse inversion Previous Hit3DNext Hit SRME, and interbed multiple elimination software

Modeling indicates that the number of streamers, the streamer separation and the sail line spacing play an essential role in improving the applicability of Previous Hit3DTop SRME algorithms.