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• W2512541844 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2016CPET mapping of Stybarrow field seismic-inversion results: Patchy or uniform saturation?Authors: Amrita SenGary MavkoJack DvorkinAmrita SenStanford UniversitySearch for more papers by this author, Gary MavkoStanford UniversitySearch for more papers by this author, and Jack DvorkinStanford UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2016-13951278.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract In this paper we demonstrate the use of the capillary pressure equilibrium theory (CPET) model to address the effects of partial saturation in order to estimate hydrocarbon saturation in a reservoir volume using acoustic impedances derived by seismic inversion. The data set used here has been donated by BHP Billiton, and is from an offshore oilfield called the Stybarrow field. The set comprises of a well with a 20-foot sandstone oil saturated pay section and 3D pre- and post-stack seismic volumes. Using the provided angle stacks and well log data, a statistical wavelet, and low impedance model, the final impedance model is computed. There are two final impedance models, derived from post-stack, and pre-stack data. The final impedance models are in agreement with one another at each of the well locations, with low impedance at the oil saturated well, and high impedance at the water saturated well. The corresponding CPET model is built based on the empirical porosity from the well log. The rock and fluid properties are available from the logs and petro physical reports provided by BHP Billiton. The CPET model has difficulty distinguishing between 0 and 30% water saturation. The impedances predicted by the CPET model are in good agreement at the two well locations (blind wells), predicting 98% oil saturation in the 97% oil saturated section, and 8% water saturation in the 5% water saturated section of the reservoir. Finally using the CPET workflow, a 3D distribution of saturation was computed from inversion derived acoustic impedance and the CPET model estimated from well log. Unlike conventional approaches of estimating saturation, our method is able to discriminate between patchy and uniform saturation. Our results on Stybarrow field data reveal that the Stybarrow field behaves in a manner very close to the uniform curve at low water saturation. However, starting at 30% water saturation or higher the distribution becomes slightly patchy. Presentation Date: Wednesday, October 19, 2016 Start Time: 3:35:00 PM Location: 167 Presentation Type: ORAL Keywords: saturation, modeling, reservoir characterization, rock physics, inversionPermalink: https://doi.org/10.1190/segam2016-13951278.1FiguresReferencesRelatedDetailsCited byCapillary pressure equilibrium theory mapping of 4D seismic inversion results to predict saturation in a gas-water systemMoumita Sengupta, Ranjana Ghosh, Amrita Sen, and Saumen Maiti13 February 2023 | GEOPHYSICS, Vol. 88, No. 2 SEG Technical Program Expanded Abstracts 2016ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2016 Pages: 5654 publication data© 2016 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 01 Sep 2016 CITATION INFORMATION Amrita Sen, Gary Mavko, and Jack Dvorkin, (2016), CPET mapping of Stybarrow field seismic-inversion results: Patchy or uniform saturation?, SEG Technical Program Expanded Abstracts : 3309-3313. https://doi.org/10.1190/segam2016-13951278.1 Plain-Language Summary Keywordssaturationmodelingreservoir characterizationrock physicsinversionPDF DownloadLoading ..." @default.
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• W2512541844 title "CPET mapping of Stybarrow field seismic-inversion results: Patchy or uniform saturation?" @default.
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