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Repeat Logging Using Distributed Acoustic Sensors And EarthquakesNormal access

Authors: R. Pevzner, B. Gurevich, K. Tertyshnikov, A. Pirogova and S. Glubokovskikh
Event name: EAGE Conference on Reservoir Geoscience 2018
Session: Session 10: VSP and DAS
Publication date: 03 December 2018
DOI: 10.3997/2214-4609.201803222
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 888.86Kb )
Price: € 20

Summary:
Repeat downhole measurements of elastic properties would be extremely valuable for constraining 4D seismic inversion. However, intervention into wells to conduct such measurements is difficult and, in rarely used in practice. Distributed fiber optic sensing allows monitoring changes of formation properties, which could affect properties of the fiber-optic sensor: alter refractive index, cause physical deformation or the way the laser pulse is scattered. DAS is already often used to monitor production noise, microseismic activity and used as a sensor in 4D VSP surveys. In this presentation we demonstrate how distributed acoustic sensing could be used to monitor changes in elastic properties of the formation by monitoring local changes in seismic wave amplitude.


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