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3D vertical seismic profile acquired with distributed acoustic sensing on tubing installation; a case study from the CO (sub 2) CRC Otway Project

Julia Correa, Roman Pevzner, Andrej Bona, Konstantin Tertyshnikov, Barry Freifeld, Michelle Robertson and Thomas Daley
3D vertical seismic profile acquired with distributed acoustic sensing on tubing installation; a case study from the CO (sub 2) CRC Otway Project
Interpretation (Tulsa) (February 2019) 7 (1): SA11-SA19

Abstract

Distributed acoustic sensing (DAS) can revolutionize the seismic industry by using fiber-optic cables installed permanently to acquire on-demand vertical seismic profile (VSP) data at fine spatial sampling. With this, DAS can solve some of the issues associated with conventional seismic sensors. Studies have successfully demonstrated the use of DAS on cemented fibers for monitoring applications; however, such applications on tubing-deployed fibers are relatively uncommon. Application of tubing-deployed fibers is especially useful for preexisting wells, where there is no opportunity to install a fiber behind the casing. In the CO (sub 2) CRC Otway Project, we acquired a 3D DAS VSP using a standard fiber-optic cable installed on the production tubing of the injector well. We aim to analyze the quality of the 3D DAS VSP on tubing, as well as discuss lessons learned from the current DAS deployment. We find the limitations associated with the DAS on tubing, as well as ways to improve the quality of the data sets for future surveys at Otway. Due to the reduced coupling and the long fiber length (approximately 20 km), the raw DAS records indicate a high level of noise relative to the signal. Despite the limitations, the migrated 3D DAS VSP data recorded by cable installed on tubing are able to image interfaces beyond the injection depth. Furthermore, we determine that the signal-to-noise ratio might be improved by reducing the fiber length.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 7
Serial Issue: 1
Title: 3D vertical seismic profile acquired with distributed acoustic sensing on tubing installation; a case study from the CO (sub 2) CRC Otway Project
Affiliation: Curtin University, Kensington, N.S.W., Australia
Pages: SA11-SA19
Published: 201902
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 28
Accession Number: 2019-034008
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section: Distributed acoustic sensing and its oilfield potential
Illustration Description: illus. incl. block diag., sects., 1 table, sketch map
Secondary Affiliation: Lawrence Berkeley National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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