Permeability Estimation in Chalk Using NMR and a Modified Kozeny Equation

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    An NMR logging-based permeability estimator was implemented for chalk. Several authors have identified the inability of accurate prediction of permeability from NMR logs in carbonates. Current models (namely Coates and SDR) may yield unreliable permeability data and require extensive calibration of parameters. Also, calibration requires data from core analysis, which undermines one of the key advantages of the technology: minimizing the need of expensive coring runs. A modified Kozeny method is used for permeability estimation from NMR logs. Unlike the model of Coates and SDR, does not require calibration. To translate the T2 relaxation distribution into pore size, an analogy is made between the NMR T2 data and the MICP output. Specific surface data acquired by the Brunauer Emmett Teller method (BET) was used to aid the interpretation of the surface relaxivity. The model was tested in a chalk reservoir borehole in the North Sea, for which NMR logs and permeability data for 4 core plugs are available. Results achieved using the modified Kozeny equation are in better agreement with the Klinkenberg permeability of core plugs than both the SDR and Coates methods. They are also superior to the results found by the application of Kozeny's equation when used without input from NMR data.
    Original languageEnglish
    Title of host publicationPoromechanics VI: Proceedings of the Sixth Biot Conference on Poromechanics
    Editors Matthieu Vandamme , Patrick Dangla , Jean-Michel Pereira , Siavash Ghabezloo
    Number of pages8
    PublisherAmerican Society of Civil Engineers
    Publication date2017
    ISBN (Electronic)9780784480779
    Publication statusPublished - 2017
    Event6th Biot Conference on Poromechanics - Ecole des Ponts ParisTech and IFSTTAR, Paris, France
    Duration: 9 Jul 201713 Jul 2017
    Conference number: 6


    Conference6th Biot Conference on Poromechanics
    LocationEcole des Ponts ParisTech and IFSTTAR
    Internet address


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