Petrophysical Characterization and Porosity-Permeability Log Calculation by Dual-Energy CT Scan: Morro do Chaves Formation, Sergipe-Alagoas Basin, Brazil

Marcelo Mendes*, Julia Favoreto, Marcos Nunes, Ariely Rigueti, Bruno Valle, Leonardo Borghi, Patrick Corbett, Maira Lima, Lorena Martins, Michele Arena

*Corresponding author for this work

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Abstract

Considered important analogues of pre-salt reservoirs in hydrocarbon-producing basins throughout eastern Brazilian shore, the coquinas of the Morro do Chaves Formation (Barremian-Aptian of the Sergipe-Alagoas Basin) were studied in this work from a petrophysical standpoint using advanced characterization methods for cores recovered from four wells (2-SMC-01-AL, 2-SMC-02-AL, 2-SMC-03-AL e 2-SMC-01-AL) drilled in the Atoll Quarry, which is located in city of São Miguel dos Campos, Alagoas State, Brazil. To understand the relationships between lithological and diagenetic heterogeneities that control the distribution of permeability-porosity properties of this Rock Type, the cores underwent Dual-Energy X-ray imaging, which determines bulk density and photoelectric factor data to define seven Rock Types and generate effective porosity curves for the studied wells. Permeabilities in the wells were modeled based on the Flow Zone Index (FZI) concept, and each reservoir interval based on the Global Hydraulic Elements (GHEs) approach. Results were calibrated with laboratory measurements in plugs, and porosity was classified by petrographic analysis by Digital Image Analysis (DIA). All wells were correlated and four internal flooding surfaces identified, with a regressive surface (RS) dividing the Morro do Chaves Formation into an upper section with better reservoir characteristics and a lower one with worse ones.

Original languageEnglish
Article number47353
JournalAnuário do Instituto de Geociências
Volume46
DOIs
Publication statusPublished - 2023

Keywords

  • Coquina
  • Rock types
  • Tomography

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Development
  • General Environmental Science
  • Geology
  • Economic Geology

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