Lithology classification and prediction in the Abu Sir Field, Nile Delta, Offshore Egypt

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2009Lithology classification and prediction in the Abu Sir Field, Nile Delta, Offshore EgyptAuthors: Dan MaguirePhilip SeligmannAhmed El FattahAndrew SpeddingDomenice DuncanOsama GawadOlivier ColnardDan MaguireNorth Alamein Petroleum CompanySearch for more papers by this author, Philip SeligmannNorth Alamein Petroleum CompanySearch for more papers by this author, Ahmed El FattahNorth Alamein Petroleum CompanySearch for more papers by this author, Andrew SpeddingHess CorporationSearch for more papers by this author, Domenice DuncanHess CorporationSearch for more papers by this author, Osama GawadHess CorporationSearch for more papers by this author, and Olivier ColnardThierry Coleou, CGGVeritasSearch for more papers by this authorhttps://doi.org/10.1190/1.3255347 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract A full offset elastic seismic inversion was conducted over the Abu Sir Field, Offshore Nile Delta, Egypt in an effort to resolve lithological and gas saturation uncertainties in a Pliocene gas accumulation prior to the drilling of an appraisal well. A significant risk in Pliocene clastic exploration and exploitation in the Nile Delta is the risk of residual gas yielding false “DHI's.” Complicated hydrocarbon fill and leak models make it difficult to predict with confidence when an observed DHI will be the result of residual gas or commercial saturations of gas. A second risk in Pliocene accumulations is the impact of low net‐to‐gross thin bed intervals within an overall slope channel levee complex. An accurate assessment of the relative proportion of channel sand vs. thin bed reservoir is important as is an assessment of the net‐to‐gross of the thin bed package. The inversion project set out to differentiate not only channel sand vs. thin bed reservoir, but also to differentiate varying net‐to‐gross within the thin bed packages. The resulting inversion was unable to resolve the question of residual gas saturation, nor to differentiate net‐to‐gross within thin bed packages, but a simplified lithology classification system based on a “shale,” “thin beds” and “sand” classification was employed and proved highly successful at predicting actually drilled lithologies in the AS‐3 appraisal well. This resulting inversion volume was then used as the basis of the geocelluar model of the field used for resource estimation.Permalink: https://doi.org/10.1190/1.3255347FiguresReferencesRelatedDetailsCited ByGeological probability of success assessment for amplitude-driven Prospects:A Nile Delta case studyJournal of Petroleum Science and Engineering, Vol. 202 SEG Technical Program Expanded Abstracts 2009ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2009 Pages: 4338 publication data© 2009 Copyright © 2009 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 14 Oct 2009 CITATION INFORMATION Dan Maguire, Philip Seligmann, Ahmed El Fattah, Andrew Spedding, Domenice Duncan, Osama Gawad, and Olivier Colnard, (2009), "Lithology classification and prediction in the Abu Sir Field, Nile Delta, Offshore Egypt," SEG Technical Program Expanded Abstracts : 2422-2426. https://doi.org/10.1190/1.3255347 Plain-Language Summary PDF DownloadLoading ...