Velocity Analysis and Update with 3D DAS-VSP to Improve Borehole/Surface Seismic Images

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2015Velocity Analysis and Update with 3D DAS-VSP to Improve Borehole/Surface Seismic ImagesAuthors: Y.* LiH. WuW. WongB. HewettZ. LiuA. MateevaJ. LopezY.* LiShell Exploration and Production CompanySearch for more papers by this author, H. WuShell Exploration and Production CompanySearch for more papers by this author, W. WongShell Exploration and Production CompanySearch for more papers by this author, B. HewettShell Exploration and Production CompanySearch for more papers by this author, Z. LiuShell Exploration and Production CompanySearch for more papers by this author, A. MateevaShell Global Solutions International B.V.Search for more papers by this author, and J. LopezShell International Exploration and Production Inc.Search for more papers by this authorhttps://doi.org/10.1190/segam2015-5864923.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Shell conducted its first dual-well 3D DAS-VSP survey concurrently with an OBS survey in a deep water environment in the Gulf of Mexico in 2012. This survey produced about 40M picks of the first arrival times (FAT) which were used to diagnose and update velocity models for improvement of both borehole and surface seismic images of subsurface structures. We developed a procedure to use the VSP-FAT to diagnose the velocity models derived from surface seismic surveys and monitor the velocity updating process. The method first was used for selecting a suitable initial velocity model. After the travel-time tomography inversion of FAT, this diagnosis approach was applied again to the updated VTI-inversion model to ensure the velocity updating effort is on the right track. We used the Absolute and Relative Misfits (AM & RM) and apparent velocities to quantify the velocity model uncertainties as functions of depth, azimuth, and offset. Both DAS-VSP data at two wells and OBS data were migrated with the initial VTI velocity model and the updated VTI-inversion model. It is found that both borehole and surface seismic images generated with the VTI-inversion model are improved from those obtained with the VTI-initial model, especially for the seismic amplitudes at a target event. Keywords: 3D, imaging, VSP, velocity, integrationPermalink: https://doi.org/10.1190/segam2015-5864923.1FiguresReferencesRelatedDetailsCited byDownhole Monitoring Using Distributed Acoustic Sensing: Fundamentals and Two Decades Deployment in Oil and Gas Industries21 March 2022Frequency‐dependent signal‐to‐noise ratio effect of distributed acoustic sensing vertical seismic profile acquisition29 December 2021 | Geophysical Prospecting, Vol. 70, No. 2A Literature Review10 December 2021On the Surmountable Limitations of Distributed Acoustic Sensing (DAS) Vertical Seismic Profiling (VSP) – Depth Calibration, Directionality, and Noise10 December 20213D salt-boundary imaging with transmitted waves in DAS VSP data acquired in saltYuting Duan, Yingping Li, Maksym Kryvohuz, Albena Mateeva, and Tianrun Chen30 September 2020Joint surface and borehole seismic tomography with simultaneous model parameter updates at Thunder Horse SouthOlga Zdraveva, Gloria Arango Solano, Syed Omar Zaman, Emmanuel Saragoussi, Aurora Rodriguez Castelan, Samarjit Chakraborty, Qingsong Li, Corey Joy, Ken Hartman, and Anya Reitz27 August 2018Joint-velocity model building and high-resolution depth imaging of full-wavefield 3D VSP dataM. 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Verschuur1 September 2016Borehole Geophysics Complete Session1 September 2016 SEG Technical Program Expanded Abstracts 2015ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2015 Pages: 5634 publication data© 2015 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 19 Aug 2015 CITATION INFORMATION Li Y.*, H. Wu, W. Wong, B. Hewett, Z. Liu, A. Mateeva, and J. Lopez, (2015), "Velocity Analysis and Update with 3D DAS-VSP to Improve Borehole/Surface Seismic Images," SEG Technical Program Expanded Abstracts : 5285-5289. https://doi.org/10.1190/segam2015-5864923.1 Plain-Language Summary Keywords3DimagingVSPvelocityintegrationPDF DownloadLoading ...