Grayscale REV Analysis

The data provided here is used to investigate the representative elementary volume (REV) size directly from grayscale micro-CT images of porous media of sandstone and carbonate. Three datasets are provided per sample: 16-bit grayscale image, 8-bit grayscale image, and segmented image. The re-quantization of a 16-bit grayscale image to 8-bit is carried out using ImageJ. The choice of intensities used carrying out this operation is provided in the supplementary information of the related publication.

This dataset includes:
1) Sand pack
Image size: 600^3 voxels
Resolution: 5.2 micrometer
Imaging Facility Used: Tyree x-ray imaging (https://www.engineering.unsw.edu.au/minerals-energy-resources/facilities/tyree-x-ray)
Porosity: 35.4%
Average Permeability: 48.72 D

2) Bentheimer Sandstone
Image size: 600^3 voxels
Resolution: 5.4 micrometer
Imaging Facility Used: Tyree x-ray imaging (https://www.engineering.unsw.edu.au/minerals-energy-resources/facilities/tyree-x-ray)
Porosity: 23.9%
Average Permeability: 4.27 D

3) Fieldstone
Image size: 500^3 voxels
Resolution: 4.98 micrometers
Data Source: This is a subset of the dataset provided at https://www.digitalrocksportal.org/projects/297
Porosity: 20%
Average Permeability: 0.993 D

4) Ketton Carbonate
Image size: 600^3 voxels
Resolution: 5 micrometer
Data Source: This is a subset of the dataset provided at https://www.digitalrocksportal.org/projects/167
Porosity: 10%
Average Permeability: 1.27 D