The Rousse-1 DAS VSP experiment — Observations and comparisons from various optical acquisition systems

Verliac, M.; Lesnikov, Vladislav; Euriat, Coline

doi:10.1190/segam2015-5886544.1

Cited by 19 publications

(3 citation statements)

References 4 publications

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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

304

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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Section: Introductionmentioning

confidence: 99%

Fiber‐Optic Network Observations of Earthquake Wavefields

Lindsey

Martin

Dreger

et al. 2017

Geophysical Research Letters

304

164

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“…Another problem is differences in interrogator design. While some comparisons of DAS outputs among several vendors (Verliac et al, 2015;Olfsson and Martinez, 2017;Sidenko et al, 2020). Verliac et al (2015) reported differing wavelets among three DAS datasets acquired with equipment from various suppliers, Olfsson and Martinez (2017) observed that differences among vendors were small.…”

Section: Introductionmentioning

confidence: 99%

“…While some comparisons of DAS outputs among several vendors (Verliac et al, 2015;Olfsson and Martinez, 2017;Sidenko et al, 2020). Verliac et al (2015) reported differing wavelets among three DAS datasets acquired with equipment from various suppliers, Olfsson and Martinez (2017) observed that differences among vendors were small. Sidenko et al (2020) confirmed that the dimensions of interrogator output were deformation rate and dynamic strain, which are the output designed by the vendors.…”

Section: Introductionmentioning

confidence: 99%

Case study on amplitude and phase response comparison between DAS and 3C geophone VSP surveys at a test site in Japan

et al. 2022

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Distributed acoustic sensing (DAS) is an effective tool for seismic surveys and is widely used as the preferred sensor for acquiring dense Vertical Seismic Profile (VSP). However, DAS has some disadvantages compared to conventional geophone acquisition, such as single-component data, sensor directivity pattern, low S/N, etc. To apply DAS data to VSP processing, it is important to understand the characteristics of DAS measurements. This study first examined DAS and geophone responses for a VSP survey in a 1D earth model. The relationship of signal amplitude as a function of incident angle and phase shift between wavelets was confirmed. Next, we validated this relationship in a walk-away VSP survey, which was conventionally applied to monitor geological CO2 storage. The survey was carried out at a test site in Japan. We obtained both three-component (3C) geophone and DAS data using a single-mode fiber installed behind a casing. The observed amplitudes of the first P-waves by DAS and geophone showed very good agreement with the theoretical expectations. Finally, we performed imaging using acquired DAS data following the workflow for conventional VSP processing. These basic behaviors of DAS are useful for designing further analyses, such as VSP in deviated wells and full waveform inversion.

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