Nuclear magnetic resonance to characterize the pore system of coquinas from morro do chaves formation, sergipe-alagoas basin, Brazil

Fernanda Oliveira Hoerlle, Edmilson Helton Rios, William Godoy de Azevedo Lopes da Silva, Elizabeth May Braga Dulley Pontedeiro, Maira da Costa de Oliveira Lima, Patrick William Michael Corbett, José Luis Drummond Alves, Paulo Couto

Research output: Contribution to journalArticle

Abstract

Nuclear magnetic resonance (NMR) is a recognized petrophysical tool in the oil and gas industry to characterize reservoir rocks and fluids. In this study, the pore system of coquinas from a single bed of a quarry in the Morro do Chaves Formation was evaluated. These sedimentary rocks have been considered as a potential analogous to some Brazilian pre-salt reservoir rocks. The objective of this work was to characterize the porous system of coquinas in terms of total porosity and pore size distribution using low-field NMR. Conversion of T2 relaxation times to pore size radii was performed and literature cut-offs were applied for porosity partitioning. Coquinas were classified and ranked according to their percentage of macro, meso and micro porosity. This work verified quantitatively the pore system heterogeneities for the coquina samples and the variation in the layer from which they were extracted. The study provides some clues on lateral porosity and pore size variation in any reservoir for which this unit is an analogue.

Original languageEnglish
Pages (from-to)317-324
Number of pages8
JournalRevista Brasileira de Geofisica
Volume36
Issue number3
DOIs
Publication statusPublished - 6 Dec 2018

Keywords

  • NMR
  • Petrophysics
  • Pore size distribution
  • Porosity partitioning
  • Total porosity

ASJC Scopus subject areas

  • Geophysics

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    Hoerlle, F. O., Rios, E. H., de Azevedo Lopes da Silva, W. G., Pontedeiro, E. M. B. D., da Costa de Oliveira Lima, M., Corbett, P. W. M., Alves, J. L. D., & Couto, P. (2018). Nuclear magnetic resonance to characterize the pore system of coquinas from morro do chaves formation, sergipe-alagoas basin, Brazil. Revista Brasileira de Geofisica, 36(3), 317-324. https://doi.org/10.22564/RBGF.V36I3.1960