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Distributed Acoustic Sensing (DAS) for Monitoring CO2 Injected into a Pinnacle-Reef ReservoirNormal access

Authors: L. Grindei, M. Kelley, A. Modroo, M. Mondanos, M. Farhadiroushan and T. Coleman
Event name: Second EAGE Workshop Practical Reservoir Monitoring 2019
Session: Alternative Technologies I
Publication date: 01 April 2019
DOI: 10.3997/2214-4609.201900005
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 634.66Kb )
Price: € 20

A large-scale carbon capture and storage (CCS) research project has been carried out by Battelle in cooperation with Core Energy LLC to evaluate the feasibility of sequestering CO2 into carbonate reef formations. The study area is located in Otsego Country, Michigan, USA, where Core Energy LLC utilizes CO2 injection for enhanced oil recovery (EOR) in Silurian pinnacle reefs. Novel monitoring tools such as distributing acoustic sensing (DAS) offer promise for monitoring CCS operations, and a time-lapse 4D DAS vertical seismic profiling (DAS VSP) seismic survey was carried out to assess the technology’s applicability for delineating and tracking injected CO2 in a carbonate reservoir. Two 3D DAS VSP surveys were acquired 16 months apart; between the first (baseline) and the second (repeat) survey 86,000 tons of CO2 had been injected. Preliminary analyses of the time lapse DAS VSP data indicates that fibre-optic distributed acoustic sensing can be used to characterize the CO2 footprint inside carbonate reservoirs.

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