Fibre-optics Sensing and Permanent Sources for Seismic Monitoring of a Large-scale CCS site in Decatur, Illinois: Preliminary Results and Lessons Learnt

Correa, Julia; Freifeld, Barry; Ajo‐Franklin, Jonathan; Dou, Shan; Commer, Michael; Daley, T.; Robertson, Michelle; Wood, Todd; McDonald, S. E.

doi:10.3997/2214-4609.202070027

EAGE Workshop on Fiber Optic Sensing for Energy Applications in Asia Pacific 2020

DOI: 10.3997/2214-4609.202070027

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Fibre-optics Sensing and Permanent Sources for Seismic Monitoring of a Large-scale CCS site in Decatur, Illinois: Preliminary Results and Lessons Learnt

Julia Correa¹,

Barry Freifeld²,

Jonathan Ajo‐Franklin³

et al.

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Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring

et al. 2021

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With new developments of fiber-optics sensing and rotary sources, continuous active seismic monitoring for onshore applications has now the opportunity to be fully realized and applied to enhance utilization and resource extraction from the subsurface. To date, conventional seismic monitoring deployments consist primarily of receiver arrays, either fixed or not, with periodic data acquisition campaigns using temporarily deployed sources, resulting in time-lapse data with poor temporal resolution. Only a few niche efforts have demonstrated continuous acquisition using fixed source-receiver networks. Herein, we present initial results of a network of fixed rotary seismic sources, referred to as surface orbital vibrators (SOVs), coupled with a permanent distributed acoustic sensing (DAS) network at the CO2CRC Otway Field Site. While rotary seismic sources are not new, our development of the SOV focused on simplifying the cost and complexity of the source hardware while delivering broad frequency spectrum of the source signal. The upgraded hardware is aligned with a robust methodology for autonomous operation and data processing. At the Otway Site we deployed SOVs at nine locations, monitoring seismic response in seven DAS instrumented wells. Baseline operation of the DAS/SOV sensor array and source system demonstrates its capability with near offsets attaining a signal-to-noise ratio approaching 100 dB with an NRMS of 10%. Furthermore, analyses of travel-time repeatability indicate that the DAS/SOV system can deliver time resolution of +/- 500 µs.

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Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring

et al. 2021

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Fibre-optics Sensing and Permanent Sources for Seismic Monitoring of a Large-scale CCS site in Decatur, Illinois: Preliminary Results and Lessons Learnt

Cited by 1 publication

References 0 publications

Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring

Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring

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