The studied Gas Shale especially the silica-rich gas-shale samples displayed permeability and elasticity anisotropy behavior. These anisotropy behaviors are closely correlated in terms of the symmetry directions which means the elastic anisotropy and permeability anisotropy share the same cause. All samples, regardless of the measurement direction, show a nonlinear reduction in permeability with increase of effective pressure (up to 3 orders of magnitude), with large variations from sample to sample and measurement direction. While the elasticity showed the less sensitivity to the effective pressure change, the velocities increases with increasing the effective pressure. The permeability and the elasticity anisotropy behaviors showed also a good correlation with quartz and clay content.

No abstract

No abstract