Micro-seismic detection using distributed acoustic sensing

Webster, Paul; Wall, J.; Perkins, Colin; Molenaar, Mathieu M.

doi:10.1190/segam2013-0182.1

Cited by 80 publications

(22 citation statements)

References 2 publications

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“…DAS systems rely on coherent optical time-domain reflectometry to measure the amplitude and phase of vibrations along a fiber (Grattan & Sun, 2000). DAS is used in the oil and gas industry for seismic profiling (e.g., Lellouch, Horne, et al, 2019;Mateeva et al, 2012), microseismic monitoring (Webster et al, 2013), and time-lapse seismic surveys (Daley et al, 2013). Its recent applications to passive earthquake seismology have demonstrated the consistency between earthquake waveforms recorded by DAS and by conventional seismometers (e.g., Ajo-Franklin et al, 2019;Biondi et al, 2017;Lindsey et al, 2017;Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Urban Seismic Site Characterization by Fiber‐Optic Seismology

et al. 2020

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Accurate ground motion prediction requires detailed site effect assessment, but in urban areas where such assessments are most important, geotechnical surveys are difficult to perform, limiting their availability. Distributed acoustic sensing (DAS) offers an appealing alternative by repurposing existing fiber‐optic cables, normally employed for telecommunication, as an array of seismic sensors. We present a proof‐of‐concept demonstration by using DAS to produce high‐resolution maps of the shallow subsurface with the Stanford DAS array, California. We describe new methods and their assumptions to assess H/V spectral ratio—a technique widely used to estimate the natural frequency of the soil—and to extract Rayleigh wave dispersion curves from ambient seismic field. These measurements are jointly inverted to provide models of shallow seismic velocities and sediment thicknesses above bedrock in central campus. The good agreement with an independent survey validates the methodology and demonstrates the power of DAS for microzonation.

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Section: Introductionmentioning

confidence: 99%

Urban Seismic Site Characterization by Fiber‐Optic Seismology

et al. 2020

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“…DAS technology has evolved in the oil and gas industry to solve a range of reservoir imaging and monitoring challenges, both onshore and offshore (Daley et al, ; Mateeva et al, ; Miller et al, ; Verliac et al, ; Webster et al, ; Zhan et al, ). Applying DAS to the problem of local, regional, and teleseismic earthquake characterization requires different metrics, such as sensing ground motion that is of lower amplitudes and lower frequency content than active source methods.…”

Section: Introductionmentioning

confidence: 99%

Fiber‐Optic Network Observations of Earthquake Wavefields

Lindsey

Martin

Dreger

et al. 2017

Geophysical Research Letters

322

164

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Our understanding of subsurface processes suffers from a profound observation bias: seismometers are sparse and clustered on continents. A new seismic recording approach, distributed acoustic sensing (DAS), transforms telecommunication fiber‐optic cables into sensor arrays enabling meter‐scale recording over tens of kilometers of linear fiber length. We analyze cataloged earthquake observations from three DAS arrays with different horizontal geometries to demonstrate some possibilities using this technology. In Fairbanks, Alaska, we find that stacking ground motion records along 20 m of fiber yield a waveform that shows a high degree of correlation in amplitude and phase with a colocated inertial seismometer record at 0.8–1.6 Hz. Using an L‐shaped DAS array in Northern California, we record the nearly vertically incident arrival of an earthquake from The Geysers Geothermal Field and estimate its backazimuth and slowness via beamforming for different phases of the seismic wavefield. Lastly, we install a fiber in existing telecommunications conduits below Stanford University and show that little cable‐to‐soil coupling is required for teleseismic P and S phase arrival detection.

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“…The first application of DAS for detecting micro-seismic events was performed by Shell [8][9]. In the field trail, they deployed the array of geophone and DAS in the same well aiming at comparing the ability and sensitivity of detecting the micro-seismic events during a stage of stimulation.…”

Section: Microseismic Monitoringmentioning

confidence: 99%

“…The first DAS operation was performed by Shell in 2009 and its capacity of acquiring the VSP measurements was reported by Mestayer et al [1]. Since then, this technique has been improved and widely tested in various field situations including the VSP [2][3][4][5][6][7], microseismic measurements [8,9], well and reservoir surveillance [10], hydraulic fracturing monitoring and diagnostics [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Current and Future Applications of Distributed Acoustic Sensing as a New Reservoir Geophysics Tool

Li¹,

Wang²,

Guo³

2015

TOPEJ

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Distributed Acoustic Sensing (DAS) is a novel technique with low cost, no production deferment, complete coverage and repeatability for seismic data acquisition in vertical seismic profile (VSP), hydraulic fracturing monitoring, well and reservoir surveillance and micro-seismic detection. In this paper, we give a review on the field applications of DAS and the corresponding pre-processing methods as well as the limitations that hinder its further applications in exploration and production. Finally, future developments for DAS are discussed, including the enhancement of S/N ratio, precise determination of receiver channels in depth, rapid processing of massive data and integrated interpretation of multi-mode optical fiber.

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Micro-seismic detection using distributed acoustic sensing

Cited by 80 publications

References 2 publications

Urban Seismic Site Characterization by Fiber‐Optic Seismology

Urban Seismic Site Characterization by Fiber‐Optic Seismology

Fiber‐Optic Network Observations of Earthquake Wavefields

Current and Future Applications of Distributed Acoustic Sensing as a New Reservoir Geophysics Tool

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