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TitleSimultaneous acquisition of distributed acoustic sensing VSP with multi-mode and singlemode fibre optic cables and 3C-geophones at the aquistore CO2 storage site
AuthorMiller, D; Daley, T; White, D; Freifeld, B; Robertson, M; Cocker, J; Craven, M
SourceCanadian Society of Exploration Geophysicists, Recorder vol. 41, no. 6, 2016 p. 28-33
LinksOnline - En ligne
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150486
PublisherCanadian Society of Exploration Geophysicists
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceSaskatchewan
NTS62E
AreaEstevan
Lat/Long WENS-103.1000 -103.0333 49.1167 49.0667
Subjectsdistributed acoustic sensing (DAS); aquistore; deep saline carbon dioxide storage; vertical seismic profiles; 3D VSP; 2D VSP
Illustrationslocation maps; well logs; graphs; 3-D models
ProgramCarbon Capture & Storage, Environmental Geoscience
AbstractA dynamite 3D VSP survey, a Vibrator 2D VSP survey and related calibration surveys at the Aquistore CO2 storage site in Saskatchewan served as a technology test for distributed acoustic sensing (DAS). DAS data was acquired as a vertical seismic profile (VSP) on two codeployed fibers, one single-mode (SM) and one multi-mode (MM), simultaneously with a 60-level 3-component wireline geophone array. A 2D grid of explosive shots, used for baseline 4D surface seismic, provided 3D-VSP data from all sensors, while vibrator sources were used for a single 2D VSP line. The DAS fibers were cemented in place on the outside of the well casing during the original well completion and extend to a depth of ~2.8 km. Good quality data was acquired by all systems with comparable SM and MM VSP results. DAS data converted to particle velocity and geophone data have comparable responses. Both explosive and vibroseis source types give good quality DAS data with expected improvement from two versus one vibroseis source. We observe variable coherent borehole noise attributed to variable cement quality. Good quality and comparable migrated images are obtained from DAS and geophone data. Following these tests, we conclude DAS 3D VSP is a viable candidate for time-lapse monitoring.
Summary(Plain Language Summary, not published)
The Aquistore CO2 storage site in Saskatchewan served as a technology test for distributed acoustic sensing (DAS). DAS uses a common optical fibre to record seismic data that is conventionally done with complex electro-mechanical sensors (geophones). The successful acquisition of a DAS vertical seismic profile (VSP) using a 2800 m optical fibre cemented in place on the outside of the well casing demonstrated that comparable seismic images are obtained from DAS and geophone data. Following these tests, we conclude DAS 3D VSP is a viable candidate for time-lapse monitoring.
GEOSCAN ID297844