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Analysis of signal to noise and directivity characteristics of DAS VSP at near and far offsets; a CO2CRC Otway Project data example

Julia Correa, Anton Egorov, Konstantin Tertyshnikov, Andrej Bona, Roman Pevzner, Tim Dean, Barry Freifeld and Steve Marshall
Analysis of signal to noise and directivity characteristics of DAS VSP at near and far offsets; a CO2CRC Otway Project data example
Leading Edge (Tulsa, OK) (December 2017) 36 (12): 994a1-994a7

Abstract

During the last decade, distributed acoustic sensing (DAS) has emerged as a new technology for seismic acquisition. DAS has the potential to reduce the cost of permanent monitoring operations over time as it offers long equipment survivability and requires minimum maintenance. However, broad adoption of DAS technology still faces some challenges, such as low sensitivity and high levels of noise compared to conventional seismic sensors. Recent developments in fiber-optic systems and cable designs aim to overcome these limitations. To understand how DAS can be used in monitoring applications, it is important to know how it behaves with varying offsets and incidence angles. An offset VSP survey was acquired, at the CO2CRC Otway Project, using a straight single-mode fiber, a straight "enhanced-backscatter" fiber, and a conventional three-component geophone tool. The results from this survey show that DAS has the potential to provide similar, or even superior, quality data sets as conventional geophones.


ISSN: 1070-485X
EISSN: 1938-3789
Serial Title: Leading Edge (Tulsa, OK)
Serial Volume: 36
Serial Issue: 12
Title: Analysis of signal to noise and directivity characteristics of DAS VSP at near and far offsets; a CO2CRC Otway Project data example
Affiliation: Curtin University, Bentley, West. Aust., Australia
Pages: 994a1-994a7
Published: 201712
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 13
Accession Number: 2018-020472
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S38°22'60" - S38°22'60", E142°28'60" - E142°28'60"
Secondary Affiliation: Lawrence Berkeley National Laboratory, USA, United StatesCO2CRC, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201811
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