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Mudstone permeability vs. porosity Limited scale-dependence

inverse modeling (scale of ~2-80 km). -15. 100 - 300 m scale (borehole). 10. 10 cm scale (cores). -16. 10. -17. 10. k (m 2 ). -18. 10. -19. 10. -20. 10. 0.8. 0.7. 0.6. 0.5. 0.4. 0.3. 0.2. porosity. Mudstone permeability vs. porosity Limited scale-dependence.

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Mudstone permeability vs. porosity Limited scale-dependence

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  1. inverse modeling (scale of ~2-80 km) -15 100 - 300 m scale (borehole) 10 10 cm scale (cores) -16 10 -17 10 k (m2) -18 10 -19 10 -20 10 0.8 0.7 0.6 0.5 0.4 0.3 0.2 porosity Mudstone permeability vs. porosityLimited scale-dependence

  2. Permeability decreases strongly with depth due to closing of fractures under increased pressure (crystalline rocks) or consolidation/porosity loss and cementation (sedimentary rocks) Ingebritsen and Manning, 1999

  3. In most rock formations, anisotropy is related to rock fabric or layering • In sedimentary rocks, effective or “bulk” properties for multiple layers may define REV. This imparts anisotropy. • In crystalline rock this is more variable and depends on fabric (if it exists), fracture orientations

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