Fig. 7From: Matrix permeability of reservoir rocks, Ngatamariki geothermal field, Taupo Volcanic Zone, New Zealanda connected porosity versus microfracture density. NM2 1354.2 B appears as an outlier with a distinctively higher connected porosity; b permeability at 5 MPa versus microfracture density, using a log scale. NM2 1354.2 B appears as an outlier with a distinctively higher permeability. Tone darkens with depth of sample, as shown in legendBack to article page