Estimation of pre-dolomitisation porosity and permeability of a nummulitic carbonate reservoir rock using the Multi-Component Architecture Method (MCAM)

Alessandro Mangione, Helen Lewis, Sebastian Geiger, Zeyun Jiang, Gary Douglas Couples, Jim Buckman, Simon Beavington-Penney, Stephen Hall

Research output: Contribution to journalArticlepeer-review

Abstract

The fossiliferous Eocene carbonate reservoir interval of the offshore Hasdrubal Field has a diagenetic history in which dolomitisation of micrite-rich facies has significantly enhanced reservoir quality. Using published information on the diagenetic evolution, digital textural representations of the limestones and dolostones are created using the Multi-Component Architecture Method (MCAM). This technique allows integration of images at different length scales (e.g., SEM, micro-/nano- XRT) which provide different forms of information about the pre-dolomitisation rock, including textural and compositional factors, and the arrangements of preserved components. These digital representations of the dolostones, together with their now completely overprinted precursor micritic limestones, permit exploration of the impact on porosity and permeability of uncemented, partly cemented and biomoulds Nummulites, their number per unit volume, and their orientation (i.e., uniformly or randomly orientated) allowing investigation of the petrophysical consequences of different distributions, orientations and abundances of the matrix and fossiliferous components. Viable diagenetic pathways, which were identified by thin section analysis as well as data available in the literature, are linked to petrophysical property evolution. In this way MCAM permits investigation of earlier stages of the diagenetic processes which were overprinted by later diagenetic processes.
Original languageEnglish
Article number105196
JournalMarine and Petroleum Geology
Volume132
Early online date22 Jun 2021
DOIs
Publication statusE-pub ahead of print - 22 Jun 2021

Keywords

  • Carbonate diagenesis
  • Carbonate porosity
  • Digital rock models
  • Dolomitisation
  • Multi-component model
  • Multi-scale pore network
  • Permeability
  • Reservoir characterisation

ASJC Scopus subject areas

  • Oceanography
  • Geophysics
  • Geology
  • Economic Geology
  • Stratigraphy

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