DRP-443 Fracture-Network Verification Overview

This report summarizes the current voids verification workflow for the two DRP-443 notebook studies:

• 29_mwe_drp443_ifn_raw_porosity_perm
• 30_mwe_drp443_dilatedifn_raw_porosity_perm

Sources

• Dataset: Digital Porous Media Portal, DRP-443 https://digitalporousmedia.org/published-datasets/drp.project.published.DRP-443
• Experimental reference paper: Song, W., Prodanovic, M., Santos, J. E., Yao, J., Zhang, K., & Yang, Y. (2022). Upscaling of Transport Properties in Complex Hydraulic Fracture Systems. SPE Journal. https://doi.org/10.2118/212849-PA

Current Notebook Setup

Both DRP-443 notebooks share the same current modeling choices:

• full-sample analysis (550 x 550 x 500 voxels), no ROI cropping
• RAW decoding with Fortran-style voxel ordering (order='F')
• void convention raw == 0
• optional pre-trimming to axis-percolating paths (trim_nonpercolating_paths = True)
• PoreSpy extraction with geometry_repairs = "imperial_export"
• conductance model valvatne_blunt
• pressure-dependent water viscosity from thermo, 298.15 K
• reference outlet pressure 5.0 MPa
• imposed pressure gradient 10 kPa/m

Summary Table

The underlying summary CSV is committed as docs/assets/validation/drp443_summary.csv.

Sample	Full-image porosity [%]	Network porosity [%]	Paper permeability [mD]	Kx [mD]	Arithmetic-mean permeability [mD]	Quadratic-mean permeability [mD]	Kx relative error [%]
IFN	16.51	16.77	130290.0	74594.21	141863.78	160495.03	-42.75
Dilated IFN	11.24	11.42	36730.0	21247.64	60523.02	72674.83	-42.15

The directional permeability data used for this table is committed as docs/assets/validation/drp443_directional.csv.

Figures

IFN

Dilated IFN

Interpretation

Under the current setup, both DRP-443 cases show a strong directional anisotropy (Kz > Ky > Kx) and a similar bias in the paper flow direction: Kx is about 42% below the paper value for both IFN and Dilated IFN.

The direction-averaged permeabilities remain above the paper Kx references, which reinforces that anisotropy and flow-direction definition are central in this dataset. In this documentation split, DRP-443 is treated as verification because the paper references are numerical LBM results rather than laboratory experimental measurements.

Reproducible Artifacts

• Notebook: notebooks/29_mwe_drp443_ifn_raw_porosity_perm.ipynb
• Notebook: notebooks/30_mwe_drp443_dilatedifn_raw_porosity_perm.ipynb
• Outputs:
• examples/data/drp-443/IFN_estimated_properties.csv
• examples/data/drp-443/IFN_kabs_directional.csv
• examples/data/drp-443/IFN_network_stats.csv
• examples/data/drp-443/DilatedIFN_estimated_properties.csv
• examples/data/drp-443/DilatedIFN_kabs_directional.csv
• examples/data/drp-443/DilatedIFN_network_stats.csv