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Distributed Acoustic Sensing (DAS) allows a single mode optic fibre to be used as a listening device with many channels along a well-bore. Shell has deployed these fibres in cables strapped to the outside of casing and cemented in place to create a permanent installation. By interrogating the fibre with laser light pulses during hydraulic fracture operations we have been able to detect micro-seismic events. In this paper we show a comparison of micro-seismic events recorded on DAS and geophones. Whilst the sensitivity of DAS is less than that of geophones, it has a much wider aperture and is better sampled, and if recorded in a deviated well, can also be used to locate the micro-seismic events.
Paul Webster is a geophysicist at Shell, based in Calgary, where he has been working for 10 years. Previous to that he has worked as a geophysicist in Woodside and at Veritas, based in Australia.
During his career he has worked on signal processing, seismic interpretation, designing 3D Marine surveys, project management and a special projects, in particular Distributed Acoustic Sensing.
He has a PhD in Physics from the University of Calgary.