Low-frequency Ambient Distributed Acoustic Sensing (DAS): Useful for subsurface investigation?

Jeffrey Shragge, Jihyun Yang, Nader A. Issa, Michael Roelens, Michael Dentith, Sascha Schediwy

Research output: Chapter in Book/Conference paperConference paperpeer-review

9 Citations (Scopus)

Abstract

Distributed Acoustic Sensing (DAS) is a rapidly growing novel sensing method for seismic data acquisition. DAS arrays are particularly well-suited for dense recording of low-frequency ambient surface waves on long (> 5km) linear sections of deployed optical fiber cable. Applying multi-channel analysis of surface waves (MASW) to ambient wavefield DAS recordings characterized by a large number of sensing points and long recording times may enable 1D characterization of the S-wave velocity profile to depths of 750 m or greater. We present a low-frequency ambient wavefield investigation using a DAS dataset acquired on an array deployed in suburban Perth, Australia. We extract storm-induced swell noise from the nearby Indian Ocean in a low-frequency band (0.1 - 1.8 Hz) and generate virtual shot gathers by applying cross-correlation and deconvolution seismic interferometric analyses. The resulting gathers are transformed into dispersion images through two different methods: phase shift and high-resolution linear Radon transform. To recover the near-surface S-wave velocity model, we first pick and then invert the recovered 1D Rayleigh-wave dispersion curves using a particle-swarm optimization algorithm. Inversion results show that low-frequency ambient-wavefield DAS data can constrain the Vs model to 750m depth, which helps validate the potential of DAS technology as a tool for large-scale surface-wave investigation.

Original languageEnglish
Title of host publicationProceedings of the 2019 SEG International Exposition and Annual Meeting
PublisherSociety of Exploration Geophysicists
Pages968-973
Number of pages6
DOIs
Publication statusPublished - 2020
EventSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 - San Antonio, United States
Duration: 15 Sept 201920 Sept 2019

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
Country/TerritoryUnited States
CitySan Antonio
Period15/09/1920/09/19

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