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Combined NMR and conventional log petrophysical evaluation of a sandstone reservoir, offshore Niger Delta, Nigeria

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Author Affiliations

  • 1Department of Physics, Faculty of Science, University of Lagos, Lagos, Nigeria
  • 2Department of Physics, Faculty of Science, University of Lagos, Lagos, Nigeria

Int. Res. J. Earth Sci., Volume 10, Issue (2), Pages 1-10, August,25 (2022)

Abstract

Joint petrophysical analysis using conventional and nuclear magnetic resonance (NMR) logs was conducted for two wells in an offshore field, Niger Delta, Nigeria, using Interactive Petrophysics (IP) software. Delineated reservoir unit comprises of 11 and 5 zones on conventional logs in wells 1 and 2 with 6 and 3 zones on NMR logs in wells 1 and 2. Results show that oil is the predominant fluid type at the delineated depth intervals. Significant difference in the values of computed petrophysical parameters of interest from conventional log analysis only compared with the values from the integration of conventional and NMR logs have been established. The sensitivity of NMR logging tools to fluid contents only in reservoirs has assisted in mitigating the shortcomings of conventional logs, thus leading to fairly more accurate and reasonable estimation of reservoir parameters. Also, If NMR tools were run in the reservoir zones devoid of NMR information, there is high probability of having the same pattern of results in situations where they have similar geological settings.

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