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    Estimation of vitrinite reflectance from well log data

    247077.pdf (1.238Mb)
    Access Status
    Open access
    Authors
    Kadkhodaie, Ali
    Rezaee, M. Reza
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Kadkhodaie, A. and Rezaee, M.R. 2017. Estimation of vitrinite reflectance from well log data. Journal of Petroleum Science and Engineering. 148: pp. 94-102.
    Source Title
    Journal of Petroleum Science and Engineering
    DOI
    10.1016/j.petrol.2016.10.015
    ISSN
    0920-4105
    School
    Department of Petroleum Engineering
    URI
    http://hdl.handle.net/20.500.11937/10933
    Collection
    • Curtin Research Publications
    Abstract

    Vitrinite reflectance (VR) data provide important information for thermal maturity assessment and source rock evaluation. The current study introduces a practical method for vitrinite reflectance determination from sonic and resistivity logs. The main determinant factor of the method is ΔRRS which is defined as the separation between cumulative frequency values of resistivity ratio (RR) and sonic log data. The values of ΔRRS range from −1 at ground level to +1 at bottom hole. The crossing point depth of the DT and RR cumulative frequency curves, where ΔRRS=0, indicates the onset of oil generation window. From the surface (ground level) to the crossing point depth ΔRRS takes negative values indicating organic material diagenesis window. Below the crossing point depth ΔRRS turns into positive values showing thermally-mature organic matter within the catagenesis window. Vitrinite reflectance measurements revealed strong exponential relationships with the calculated ΔRRS data. Accordingly, a new calibration chart was proposed for VR estimation based on ΔRRS data. Finally, an equation is derived for vitrinite reflectance estimation from ΔRRS and geothermal gradient. The proposed equation works well in the event of having limited VR calibration data.

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