TY - JOUR
T1 - Nuclear magnetic resonance to characterize the pore system of coquinas from morro do chaves formation, sergipe-alagoas basin, Brazil
AU - Hoerlle, Fernanda Oliveira
AU - Rios, Edmilson Helton
AU - de Azevedo Lopes da Silva, William Godoy
AU - Pontedeiro, Elizabeth May Braga Dulley
AU - da Costa de Oliveira Lima, Maira
AU - Corbett, Patrick William Michael
AU - Alves, José Luis Drummond
AU - Couto, Paulo
PY - 2018/12/6
Y1 - 2018/12/6
N2 - 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.
AB - 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.
KW - NMR
KW - Petrophysics
KW - Pore size distribution
KW - Porosity partitioning
KW - Total porosity
UR - http://www.scopus.com/inward/record.url?scp=85072083582&partnerID=8YFLogxK
U2 - 10.22564/RBGF.V36I3.1960
DO - 10.22564/RBGF.V36I3.1960
M3 - Article
AN - SCOPUS:85072083582
SN - 0102-261X
VL - 36
SP - 317
EP - 324
JO - Revista Brasileira de Geofisica
JF - Revista Brasileira de Geofisica
IS - 3
ER -