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Distributed Acoustic Sensing for Geophysical MonitoringNormal access

Authors: J. Mestayer, S. Grandi Karam, B. Cox, P. Wills, A. Mateeva, J. Lopez, D. Hill and A. Lewis
Event name: 74th EAGE Conference and Exhibition incorporating EUROPEC 2012
Session: Advances in Seismic Sensing & Imaging
Publication date: 04 June 2012
DOI: 10.3997/2214-4609.20148800
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 1.32Mb )
Price: € 20

Summary:
Distributed Acoustic Sensing (DAS), a rapidly evolving fiber-optic based technology for permanent in-well and geophysical monitoring, has been used to record VSP data in multiple Shell assets onshore Canada, USA, Europe, and the Middle East. Useful in-well velocity data were gathered from the entire length of the well from wellhead to TD (up to 4 km), which compared well with geophone recordings and sonic log data. Walk-away VSP data yield images that are nearly equivalent to images from conventional borehole geophones in terms of signal to noise ratio and resolution. Permanently installed fiber-optic infrastructure will enable low-cost non-intrusive geophysical monitoring.


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