  Permeability measured on three samples in a triaxial cell under effective
confining pressure from 0.2 to 2.5 MPa ranges from 10E-18 to 10E-19m2. Overall,
results indicate that permeability decreases with effective confining pressure
up to 1.5 MPa; however, measurements at low effec-tive pressure are too
dispersed to yield a precise general relationship between permeability and
pressure. When the effective pressure is increased from 1.5 to 2.5 MPa,
permeability is roughly constant (~1-4 x 10E-19 m2). Samples deformed in the
triaxial cell developed slickenlined fractures, and permeability measurements
were performed before and after failure. A permeability increase is observed
when the sample fails under low effective confining pressure (0.2 MPa), but not
under effective pressure corresponding to the overburden stress. Under
isotropic stress conditions, permeability decrease related to fracture closure
occurs at a relatively high effective pressure of ~1.5 MPa. Coefficients of
friction on the fractures formed in the triaxial cell are ~0.4.
