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Related Experiment Video

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Improved method for effective rock microporosity estimation using X-ray microtomography.

H E Cid1, G Carrasco-Núñez2, V C Manea3

  • 1X-ray Microtomography Laboratory (LUMIR), Centro de Geociencias, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Queretaro, 76230, Mexico; Energy Futures Lab, Imperial College London, London, SW7 2AZ, UK.

Micron (Oxford, England : 1993)
|March 16, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for analyzing rock porosity using X-ray microtomography (μCT). The improved technique accurately measures total porosity, including micropores, crucial for understanding geothermal reservoir potential.

Keywords:
Effective porosityMacroporosityMicroporosityPermeabilityX-ray microtomography

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Area of Science:

  • Geosciences
  • Petrophysics
  • Materials Science

Background:

  • X-ray microtomography (μCT) is vital for analyzing porous media in hydrocarbon and geothermal reservoirs.
  • Traditional porosity estimation methods using μCT often overlook microporosity, which is essential for permeability assessment.

Purpose of the Study:

  • To develop an improved method for calculating total effective porosity and simulating absolute permeability from μCT data.
  • To accurately incorporate microporosity into petrophysical analyses of reservoir rocks.

Main Methods:

  • Combined X-ray computed microtomography (μCT) with a greyscale interclass variance thresholding method.
  • Segmented 3D μCT data into solid, macroporous, and an intermediate region for microporosity calculation.
  • Utilized a Matlab code to determine microporosity and a new thresholding value for total porosity.

Main Results:

  • Micropores constitute approximately 50% of the total porosity in the analyzed rock samples.
  • The proposed method accurately calculates total effective porosity by including micropores.
  • Absolute permeability simulations were performed on connected pores using the refined porosity data.

Conclusions:

  • Microporosity significantly influences effective porosity calculations and is critical for assessing geothermal reservoir potential.
  • The developed μCT analysis method enhances the characterization of porous media for energy resource exploration.