Fig. 4
From: Reactivation of variably sealed joints and permeability enhancement in geothermal reservoir rocks
Mechanical data for a selection of joint-free and jointed samples. Left panel: joint-free samples, with oblique bedding. One sample per investigated stratigraphic unit is included. Right panel: jointed samples containing obliquely oriented joints. One sample per investigated stratigraphic unit is included. a, b Differential stress as a function of strain. c, d Porosity reduction as a function of strain. e, f Differential stress as a function of porosity reduction