Petrophysical Correlations for the Permeability of Coquinas (Carbonate Rocks)

Autor: Maira da Costa de Oliveira Lima, Austin Boyd, Paulo Couto, M. Th. van Genuchten, Leonardo Borghi, Amir Raoof, M. Ramirez, E. M. Pontedeiro
Přispěvatelé: Universidade Federal do Rio de Janeiro (UFRJ), Univ Utrecht, Universidade Estadual Paulista (Unesp), Hydrogeology, Environmental hydrogeology
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Transport in Porous Media, 135(2), 287. Springer Netherlands
ISSN: 0169-3913
Popis: Made available in DSpace on 2021-06-25T11:22:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-04 Shell Brasil Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The pore structure of many carbonate formations is known to be very complex and heterogeneous. Heterogeneity is manifested by the presence of different types, sizes, and shapes of pores resulting from sedimentation and diagenetic actions. These complexities greatly increase uncertainties in estimated rock hydraulic properties in that different permeability values may occur for samples having similar porosities. In order to understand the effects of pore structure and heterogeneity, petrophysical analyses were performed on coquina samples from the Morro do Chaves Formation (Barremian, Sergipe-Alagoas Basin), which is an analogue of Brazilian Pre-salt oil reservoirs of Itapema Formation in the Santos Basin. Routine core analyses, and NMR and MICP measurements were carried out to obtain pore body and pore throat distributions. ObtainedT(2) relaxation times were converted to pore size radii by matching the NMR and MICP curves. Pore-scale imaging and pore network modelling were performed using microCT scans and the PoreFlow software, respectively. Calculated permeabilities using PoreFlow showed excellent agreement with the routine laboratory measurements. Samples having pore bodies with a higher coordination number showed much larger permeabilities at similar porosities. This study includes a statistical analysis of various features that caused the observed differences in permeability of the coquinas, including the role of connectivity of the entire porous system. Limitations and challenges of the various techniques, and the imaging and pore-scale flow simulations, are discussed. Univ Fed Rio de Janeiro, COPPE, Dept Civil Engn, Rio De Janeiro, Brazil Univ Fed Rio de Janeiro, COPPE, Dept Mech Engn, Rio De Janeiro, Brazil Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands Univ Fed Rio de Janeiro, LAGESED, Dept Geol, Rio De Janeiro, Brazil Sao Paulo State Univ, CEA, Ctr Environm Studies, Rio Claro, SP, Brazil Sao Paulo State Univ, CEA, Ctr Environm Studies, Rio Claro, SP, Brazil Shell Brasil: ANP 19027-2 Shell Brasil: 18993-6 Shell Brasil: ANP 20163-2 CAPES: 001
Databáze: OpenAIRE
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