Shallow characterization and monitoring of the Aquistore CO2 storage site from spatially windowed surface-wave analysis with a permanent seismic source

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2017Shallow characterization and monitoring of the Aquistore CO2 storage site from spatially windowed surface-wave analysis with a permanent seismic sourceAuthors: Tatsunori IkedaTakeshi TsujiMasashi NakatsukasaHideaki BanAyato KatoKyle WorthDonald WhiteBrian RobertsTatsunori IkedaKyushu UniversitySearch for more papers by this author, Takeshi TsujiKyushu UniversitySearch for more papers by this author, Masashi NakatsukasaJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Hideaki BanJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Ayato KatoJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Kyle WorthPetroleum Technology Research CentreSearch for more papers by this author, Donald WhiteGeological Survey of CanadaSearch for more papers by this author, and Brian RobertsGeological Survey of CanadaSearch for more papers by this authorhttps://doi.org/10.1190/segam2017-17675582.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We characterized and monitored spatial variation of the shallow subsurface at the Aquistore CO2 storage site, managed by the Petroleum Technology Research Centre, Canada. In this study, a continuous and controlled seismic source system called the ACROSS was used to enhance source repeatability and temporal resolution in the monitoring. To extract spatial variations of the surface-wave phase velocity using a fixed single source, we introduced a spatial window in surface-wave analysis. We succeeded in extracting lateral variation of phase velocities consistent with the shallow geological conditions. We also observed seasonal variation of phase velocities. Higher phase velocities observed in winter could be explained by freezing of water in shallow sediments, and their spatial variation might be related to the difference of the degree of freezing. Furthermore, we observed a mode transition between winter and warmer seasons, suggesting the importance of careful mode identification for robust monitoring. In warmer seasons, our monitoring approach showed high temporal stability, indicating the potential to identify the spatial distribution of shallow CO2 leakage. Presentation Date: Thursday, September 28, 2017 Start Time: 10:10 AM Location: 360C Presentation Type: ORAL Keywords: signal processing, time-lapse, shallow, near surface, surface wavePermalink: https://doi.org/10.1190/segam2017-17675582.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2017ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2017 Pages: 6093 publication data© 2017 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 17 Aug 2017 CITATION INFORMATION Tatsunori Ikeda, Takeshi Tsuji, Masashi Nakatsukasa, Hideaki Ban, Ayato Kato, Kyle Worth, Donald White, and Brian Roberts, (2017), "Shallow characterization and monitoring of the Aquistore CO2 storage site from spatially windowed surface-wave analysis with a permanent seismic source," SEG Technical Program Expanded Abstracts : 5465-5470. https://doi.org/10.1190/segam2017-17675582.1 Plain-Language Summary Keywordssignal processingtime-lapseshallownear surfacesurface wavePDF DownloadLoading ...