DAS 3DVSP survey at Stratigraphic Test Well (Hydrate-01)

Abstract

PreviousNext No AccessProceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021DAS 3DVSP survey at Stratigraphic Test Well (Hydrate-01)Authors: Akira FujimotoTeckkean LimMachiko TamakiKyojiro KawaguchiToshiaki KobayashiSeth S. HainesTimothy S. CollettRay BoswellAkira FujimotoJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Teckkean LimToyo Engineering CorporationSearch for more papers by this author, Machiko TamakiJapan Oil Engineering Co., Ltd.Search for more papers by this author, Kyojiro KawaguchiToyo Engineering CorporationSearch for more papers by this author, Toshiaki KobayashiJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Seth S. HainesU.S. Geological SurveySearch for more papers by this author, Timothy S. CollettU.S. Geological SurveySearch for more papers by this author, and Ray BoswellNational Energy Technology Laboratory, U.S. Department of EnergySearch for more papers by this authorhttps://doi.org/10.1190/segj2021-006.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract This proceeding outlines the acquisition, processing, and fault interpretation of the largest known onshore distributed acoustic sensing (DAS) 3D vertical seismic profile (VSP) survey. This survey was carried out to detect the distribution of faults near the gas hydrate research well (Stratigraphic Test Well: Hydrate-01) on the North Slope of Alaska within the Prudhoe Bay Unit (PBU). The data were recorded with a single-mode DAS cable which is permanently installed and cemented behind the casing of the Hydrate-01 well. A total of 1701 shot records were successfully acquired in 12 days using a DAS interrogator with two vibroseis sources. The data were converted from strain rate to a geophone equivalent for further data processing. Traveltime tomography was carried out using the first break of each shot and was used to build a 3D tilted transverse isotropy (TTI) velocity model. The data were processed with a sequence designed to produce a precise and high resolution P wave image, that included editing, redatum, band pass filtering, denoise, upgoing / downgoing wavefield separation, deconvolution and migration. Faults around the Hydrate-01 were interpreted using the 3DVSP volume and its attributes. These faults were clearly observed in the 3DVSP volume but they cannot be recognized by an existing 3D surface seismic volume. Keywords: gas hydrate, DAS, VSP, North SlopePermalink: https://doi.org/10.1190/segj2021-006.1FiguresReferencesRelatedDetails Proceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021ISSN (online):2159-6832Copyright: 2021 Pages: 349 publication data© 2021 Published in electronic format with permission by the Society of Exploration Geophysicists of JapanPublisher:Society of Exploration GeophysicistsSociety of Exploration Geophysicists of Japan HistoryPublished Online: 29 Nov 2021 CITATION INFORMATION Akira Fujimoto, Teckkean Lim, Machiko Tamaki, Kyojiro Kawaguchi, Toshiaki Kobayashi, Seth S. Haines, Timothy S. Collett, and Ray Boswell, (2021), "DAS 3DVSP survey at Stratigraphic Test Well (Hydrate-01)," SEG Global Meeting Abstracts : 19-22. https://doi.org/10.1190/segj2021-006.1 Plain-Language Summary Keywordsgas hydrateDASVSPNorth SlopePDF DownloadLoading ...