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High Resolution Mirror Imaging of 4D OBC Data at ValhallNormal access

Authors: R. Milne, E.J. Kjos, A. Dawson and M. Ortin
Event name: Third EAGE Workshop on Permanent Reservoir Monitoring 2015
Session: PRM Technology - Deeper Dimensions
Publication date: 16 March 2015
DOI: 10.3997/2214-4609.201411968
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 6.14Mb )
Price: € 20

Summary:
The specifications of the permanent OBC (LoFS) array at Valhall were designed to produce time-lapse images of the reservoir at 2.5km depth. Advances in processing technology have been leveraged to re-process the data from several legacy LoFS surveys in order to produce high resolution images of the overburden, beyond the original specification of the array. Inclusion of the down-going arrivals into the workflow improves shallow coverage to provide a near-continuous image of the sea bed. Processing of the down-going arrivals in a 4D sense provides high resolution time-lapse images much shallower than was previously achievable. Analysis of LoFS recordings of an ultra-high resolution site survey demonstrate that the array can be reliably used to record frequencies up to 500Hz.


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