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DRP-317 Sandstone Validation Overview

This report summarizes the current voids validation workflow for all eleven DRP-317 sandstone notebooks:

  • 20_mwe_drp317_banderagray_raw_porosity_perm
  • 28_mwe_drp317_parker_raw_porosity_perm
  • 26_mwe_drp317_kirby_raw_porosity_perm
  • 21_mwe_drp317_banderabrown_raw_porosity_perm
  • 22_mwe_drp317_bereasistergray_raw_porosity_perm
  • 23_mwe_drp317_bereauppergray_raw_porosity_perm
  • 18_mwe_drp317_berea_raw_porosity_perm
  • 25_mwe_drp317_castlegate_raw_porosity_perm
  • 24_mwe_drp317_buffberea_raw_porosity_perm
  • 27_mwe_drp317_leopard_raw_porosity_perm
  • 19_mwe_drp317_bentheimer_raw_porosity_perm

Sources

  • Dataset: Neumann, R., ANDREETA, M., Lucas-Oliveira, E. (2020, October 7). 11 Sandstones: raw, filtered and segmented data [Dataset]. Digital Porous Media Portal. https://www.doi.org/10.17612/f4h1-w124
  • Experimental reference paper: Neumann, R. F., Barsi-Andreeta, M., Lucas-Oliveira, E., Barbalho, H., Trevizan, W. A., Bonagamba, T. J., & Steiner, M. B. (2021). High accuracy capillary network representation in digital rock reveals permeability scaling functions. Scientific Reports, 11, 11370. https://doi.org/10.1038/s41598-021-90090-0

Current Notebook Setup

All DRP-317 notebooks share the same current modeling choices:

  • a porosity-matched coarse ROI scan rather than a fixed centered ROI
  • snow2 extraction through the current PoreSpy backend
  • generic_poiseuille conductance
  • pressure-dependent water viscosity from the thermo backend
  • absolute outlet pressure 5.0 MPa
  • imposed pressure gradient 10 kPa/m
  • reported aggregate permeability as the quadratic mean across Kx, Ky, and Kz

Summary Table

The underlying summary CSV is committed as docs/assets/validation/drp317_summary.csv.

Sample Notebook Experimental porosity [%] Full-image porosity [%] Network porosity [%] Experimental permeability [mD] Quadratic-mean permeability [mD] Relative permeability error [%]
Bandera Gray 20_mwe_drp317_banderagray_raw_porosity_perm 18.10 21.03 20.70 9.0 49.97 455.20
Parker 28_mwe_drp317_parker_raw_porosity_perm 14.77 13.65 12.90 10.0 20.43 104.32
Kirby 26_mwe_drp317_kirby_raw_porosity_perm 19.95 21.49 22.00 62.0 127.01 104.85
Bandera Brown 21_mwe_drp317_banderabrown_raw_porosity_perm 24.11 21.18 21.25 63.0 63.12 0.18
Berea Sister Gray 22_mwe_drp317_bereasistergray_raw_porosity_perm 19.07 19.79 20.20 80.0 127.01 58.77
Berea Upper Gray 23_mwe_drp317_bereauppergray_raw_porosity_perm 18.56 19.65 19.91 86.0 113.96 32.52
Berea 18_mwe_drp317_berea_raw_porosity_perm 18.96 21.67 21.82 121.0 139.98 15.69
Castlegate 25_mwe_drp317_castlegate_raw_porosity_perm 26.54 24.67 25.16 269.0 296.92 10.38
Buff Berea 24_mwe_drp317_buffberea_raw_porosity_perm 24.02 22.71 23.40 275.0 313.09 13.85
Leopard 27_mwe_drp317_leopard_raw_porosity_perm 20.22 19.50 20.01 327.0 321.71 -1.62
Bentheimer 19_mwe_drp317_bentheimer_raw_porosity_perm 22.64 26.72 27.57 386.0 505.19 30.88

Figures

DRP-317 permeability scatter

DRP-317 permeability comparison

DRP-317 porosity comparison

Interpretation

Across all eleven samples, the current image-to-network workflow is strongly case-dependent. Several rocks are close to the experimental permeability scale, while lower-permeability and strongly heterogeneous cases still show large errors. The main validation signal remains that extraction representativeness and flow-limiting geometry dominate the mismatch more than the pressure-aware viscosity update.

Sample Reports