Table 1. Some Petrophysical and Geomechanical Properties of Shales^65,66.

property	average value/range
bulk density (mg/m3)	2.30
porosity (%)	15 (7–30)
permeability (m/s)	1 × 10–9 (1 × 10–6–10–12)
UCS (MPa)	20 (3–30)
Young’s modulus (GPa)	5.0
Poisson’s ratio	0.22
resistivity (Ohm-m)	0.5–15