Frequency-dependent bright spots on Q-compensated ZVSP stacks at and below highly attenuated hydrocarbon-bearing reservoir – A case study

PreviousNext No AccessFirst International Meeting for Applied Geoscience & Energy Expanded AbstractsFrequency-dependent bright spots on Q-compensated ZVSP stacks at and below highly attenuated hydrocarbon-bearing reservoir – A case studyAuthors: Sayyid Suhail AhmadOscar Augusto BarriosBob EngelmanSayyid Suhail AhmadHalliburtonSearch for more papers by this author, Oscar Augusto BarriosHalliburtonSearch for more papers by this author, and Bob EngelmanHalliburtonSearch for more papers by this authorhttps://doi.org/10.1190/segam2021-3582808.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractUsing available surface seismic data and zero offset vertical seismic profile (ZVSP) data before and after Q-compensation, we investigated frequency-dependent seismic amplitude anomalies below a hydrocarbon-bearing reservoir situated in the Norwegian North Sea. The reservoir is heterogeneous and approximately 55 m thick. During ZVSP data processing, we observed anomalously different interval velocities around and within the reservoir. In addition, we also carried out Q attenuation calculation from ZVSP data and observed quite high attenuation within the reservoir affecting the amplitude and frequency of the ZVSP data. Low-frequency anomalies are observed with a time delay both on surface seismic and on ZVSP data. Low-frequency anomalies on conventionally processed VSP data are observed with medium amplitudes; however, to see the effect of attenuation compensation on these low-frequency anomalies, we carried out frequency-dependent Q-compensation and observed significantly and interestingly high amplitudes at low-frequency below the reservoir when compared with conventionally processed ZVSP data.Keywords: amplitude, frequency-domain, sandstone, borehole acoustics, attenuationPermalink: https://doi.org/10.1190/segam2021-3582808.1FiguresReferencesRelatedDetails First International Meeting for Applied Geoscience & Energy Expanded AbstractsISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2021 Pages: 3561 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 01 Sep 2021 CITATION INFORMATION Sayyid Suhail Ahmad, Oscar Augusto Barrios, and Bob Engelman, (2021), "Frequency-dependent bright spots on Q-compensated ZVSP stacks at and below highly attenuated hydrocarbon-bearing reservoir – A case study," SEG Technical Program Expanded Abstracts : 1166-1170. https://doi.org/10.1190/segam2021-3582808.1 Plain-Language Summary Keywordsamplitudefrequency-domainsandstoneborehole acousticsattenuationPDF DownloadLoading ...