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• W2891462519 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Comparison of DAS (distributed acoustic sensor) and seismometer measurements to evaluate physical quantities in the fieldAuthors: Junzo KasaharaYoko HasadaHirotaka KawashimaYoshihiro SugimotoYasutomo YamauchiTakashi YamaguchiKenji YamaguchiJunzo KasaharaENAA and Tokyo University of Marine Science and TechnologySearch for more papers by this author, Yoko HasadaDaiwa Exploration and ConsultingSearch for more papers by this author, Hirotaka KawashimaDia ConsultantsSearch for more papers by this author, Yoshihiro SugimotoDia ConsultantsSearch for more papers by this author, Yasutomo YamauchiDia ConsultantsSearch for more papers by this author, Takashi YamaguchiENAASearch for more papers by this author, and Kenji YamaguchiCRIEPISearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2989627.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Seismic exploration and time-lapse study require knowledge of the physical quantity of measurement. Although a DAS (distributed acoustic sensor) is very useful because it can provide very dense seismic records telemetered to a data center 20 km away, the quality of data and comparison of waveforms to those for conventional geophones or seismometers are not well understood. According to Schlumberger Co., their DAS measures the strain rate parallel to the fiber length in contrast to a geophone measuring the particle motion of displacement. To confirm the physical quantity of DAS measurement in a field study, we carried out experiments using DAS and three-component (3C) seismometers at the same location. We used three 100-m-long optical fibers buried at 20 cm depth and 18 units of low-frequency 3C seismometers. The 4-day experiment was carried out in September 2017. The three fibers located at approximately the same positions showed nearly the same waveforms with some subtle differences. This suggests that differences among the three fibers in casings, qualities of optical fibers and coupling to the ground made no significant difference to waveforms. For two natural earthquakes, we compared the DAS records to the calculated strain rate using horizontal seismometer records. The comparison of S-wave phases showed surprisingly good matching with each other. The phase-to-phase fitting of DAS and seismometers suggests that theoretical and observed strain records can be compared. In addition, although the incident angle to the fibers was nearly vertical, the horizontal DAS records showed clear P-wave arrivals. Presentation Date: Tuesday, October 16, 2018 Start Time: 1:50:00 PM Location: Poster Station 10 Presentation Type: Poster Keywords: DAS (distributed acoustic sensors), fiber-optic sensors, sensors, acquisition, vertical seismic profile (VSP)Permalink: https://doi.org/10.1190/segam2018-2989627.1FiguresReferencesRelatedDetailsCited byVerification of dynamic strain field measurements made with DAS during active-source vibration by quantitative comparison to geophonesPeter G. Hubbard, Joseph Vantassel, Brady R. Cox, James W. Rector, Michael Yust, and Kenichi Soga15 August 2022Downhole Monitoring Using Distributed Acoustic Sensing: Fundamentals and Two Decades Deployment in Oil and Gas Industries21 March 2022A Literature Review10 December 2021 SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Junzo Kasahara, Yoko Hasada, Hirotaka Kawashima, Yoshihiro Sugimoto, Yasutomo Yamauchi, Takashi Yamaguchi, and Kenji Yamaguchi, (2018), Comparison of DAS (distributed acoustic sensor) and seismometer measurements to evaluate physical quantities in the field, SEG Technical Program Expanded Abstracts : 191-195. https://doi.org/10.1190/segam2018-2989627.1 Plain-Language Summary KeywordsDAS (distributed acoustic sensors)fiber-optic sensorssensorsacquisitionvertical seismic profile (VSP)PDF DownloadLoading ..." @default.
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• W2891462519 title "Comparison of DAS (distributed acoustic sensor) and seismometer measurements to evaluate physical quantities in the field" @default.
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