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Capturing the Value of High Resolution Source-Over-Streamer Acquisition at Barent SeaNormal access

Authors: N. Salaun, G. Henin, A. Wright, S. Pellerin, J. Deprey, B. Deschizeaux, V. Souvannavong, P. Dhelie and V. Danielsen
Event name: 81st EAGE Conference and Exhibition 2019
Session: Imaging Case Studies I
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901178
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 6.73Mb )
Price: € 20

Summary:
New source over the streamer acquisition has been designed to record a wide range of incidence angles, excellent near offset coverage and low levels of ambient noise due to the deep streamer tow. Along with this optimal acquisition, a specific processing sequence needs to be applied to ensure a high resolution image from top to bottom of the seismic section. This is presented on a large scale Barents Sea case study. An advanced demultiple sequence, benefiting from the full recorded water bottom, was implemented to reveal thin details hidden by complex multiple content at target levels. This and the favorable signal to noise ratio gives us access to the enhanced AVO attributes compared to the conventional acquisition. This new seismic information was accurately located in the subsurface by having both the correct surface device position and an improved velocity field. The first one has been obtained by taking advantage of the direct arrival recorded while the second one relies on an accurate Residual Move-Out (RMO) analysis.


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