Figure F7. Porosity vs. permeability for samples with (A) >5% fresh rock and (B) <5% fresh rock. Solid circles = >20% fresh rock; open circles = 5%–20% fresh rock. X = permeability measurements that are not considered reliable because of failure during testing. Samples that have <5% fresh rock have a linear correlation between permeability and porosity, whereas samples with >5% fresh rock are less well correlated.