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• W2891279498 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Study of intrinsic versus scattering attenuation of seismic waves from borehole measurementsAuthors: Anastasia PirogovaBoris GurevichRoman PevznerSergey VlasovAnastasia PirogovaCurtin UniversitySearch for more papers by this author, Boris GurevichCurtin University; CSIROSearch for more papers by this author, Roman PevznerCurtin UniversitySearch for more papers by this author, and Sergey VlasovSantosSearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2997036.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Estimation of scattering and intrinsic attenuation factors from seismic observations is of interest for subsurface imaging and characterization. We discuss a waveform inversion (WI) method for zero-offset seismic borehole data that explicitly models interference and multiple scattering in layered media using well logs. On the synthetic example, we show capability of WI to discriminate between scattering and intrinsic Q in 1D vertically inhomogeneous media. Depending on the scale of the supplied logs, the inverted Q-factors correspond either to the ‘effective’ attenuation or solely to the intrinsic absorption in rocks. We apply the WI to the nearly zero-offset VSP dataset acquired in the Nephrite-8 well (Cooper Basin, Australia). The borehole intersects the Patchawarra formation characterized by high-contrast interlayering of coal seams. For this formation, estimated intrinsic attenuation 1/Qint ≈ 0.014 is negligible compared to the stratigraphic filtering 1/Qscat ≈ 0.121±0.02. These 1/Qscat estimates are somewhat higher than those obtained by the application of the generalized O’Doherty - Anstey theory. Presentation Date: Wednesday, October 17, 2018 Start Time: 8:30:00 AM Location: 212A (Anaheim Convention Center) Presentation Type: Oral Keywords: attenuation, vertical seismic profile (VSP), inversionPermalink: https://doi.org/10.1190/segam2018-2997036.1FiguresReferencesRelatedDetailsCited byMultiwell study of seismic attenuation at the CO2CRC Otway project geosequestration site: Comparison of amplitude decay, centroid frequency shift and 1D waveform inversion methods26 May 2019 | Geophysical Prospecting, Vol. 67, No. 7 SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Anastasia Pirogova, Boris Gurevich, Roman Pevzner, and Sergey Vlasov, (2018), Study of intrinsic versus scattering attenuation of seismic waves from borehole measurements, SEG Technical Program Expanded Abstracts : 5387-5391. https://doi.org/10.1190/segam2018-2997036.1 Plain-Language Summary Keywordsattenuationvertical seismic profile (VSP)inversionPDF DownloadLoading ..." @default.
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