Fluid substitution studies for North Sea chalk logging data

Lars Gommesen, G. Mavko, T. Mukerji, Ida Lykke Fabricius

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Abstract

We have tested the application of respectively the Kuster-Toksöz and the Gassmann theory as a tool for predicting pore fluid from the elastic properties of brine-saturated North Sea reservoir chalk. We confirm that the Kuster-Toksöz model predicts a larger fluid effect thant the Gassmann model, and show that the Kuster-Toksöz model fails to predict the presence of hydrocarbons. The Gassmann prediction for the near and potentially invaded zone corresponds more closely to logging data, than the Gassmann prediction for the far, virgin zone. We hereby conclude that the Gassmann theory predicts hydrocarbons well in chalk in the sonic frequency domain, but the fluid effects as recorded by the acoustic tool is significantly affected by invasion of mud filtrate.
Original languageEnglish
Title of host publicationSEG International Exposition and 72nd Annual Meeting, Salt Lake City, UT, October 6-11, 2002 : 2002 Technical Program - Expanded Abstract
VolumeCD-ROM
Place of PublicationTulsa, OK
PublisherSociety of Exploration Geophysicists
Publication date2002
Publication statusPublished - 2002
EventSEG International Exposition and 2nd Annual Meeting - Salt Lake City, United States
Duration: 6 Oct 200211 Oct 2002

Conference

ConferenceSEG International Exposition and 2nd Annual Meeting
CountryUnited States
CitySalt Lake City
Period06/10/200211/10/2002

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