... loading, because the loading is assumed to cause no tangential traction on a closed crack face. This model has been extended (Morlier 1973, Zimmerman 1991) to account for the presence of a distribution of aspect ratios. The resulting models successfully explain how the bulk compressibility of a cracked...

... symbols in the upper left graph.) Other petrophysical parameters that are known to exhibit pressure sensitivity are the sonic velocities of rocks (Halleck et al. 1988). This stress dependency is assumed to be related to the compressibility of the pore space, which in turn can be traced back to geometrical...