The role of macroporosity and microporosity in constraining uncertainties and in relating velocity to permeability in carbonate rocks

Gregor T. Baechle, Ralf Weger, Gregor P Eberli, Jose Luis Massaferro

Research output: Contribution to journalArticle

19 Scopus citations


Velocity -porosity transforms and porosity -permeability transforms are frequently used for upscaling of rock properties from core and log scale to reservoir scale. Carbonate rocks often show a large scatter in the relationship between porosity and permeability. Hence further analyses are required in order to better predict permeability, which would result in more accurate reservoir modeling, and better reserve predictions. Incorporating image analysis enables us to reduce the uncertainties present in velocity and permeability scatter. Obtaining the microporosity by subtracting the macroporosity from the plug porosity leads to a better correlation with velocity than total porosity. The trend follows the Wyllie time average trend line. The deviation between measured total porosity and microporosity, the image macroporosity, is an excellent indicator of permeability in our dataset. Using the image macroporosity versus permeability trend reduces the uncertainty of permeability prediction by more than one order of magnitude. In our case, the microporosity is the dominant ineffective porosity for fluid flow. This reduction in uncertainty allows for better reservoir prediction and development.

Original languageEnglish (US)
Pages (from-to)1662-1665
Number of pages4
JournalSEG Technical Program Expanded Abstracts
Issue number1
StatePublished - Jan 1 2004


ASJC Scopus subject areas

  • Geophysics
  • Geotechnical Engineering and Engineering Geology

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