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Table 2 Results of quantitative microstructural characterization

From: Physical property relationships of the Rotokawa Andesite, a significant geothermal reservoir rock in the Taupo Volcanic Zone, New Zealand

Sample name Crack density for intercepts parallel to orientation axisP|| (mm−1) Crack density for intercepts perpendicular to orientation axisP |(mm−1) Crack area per unit volume Sv (mm2/mm3) Anisotropy factorΩ2,3 Connected porosity (vol%)
27_21_0B 13.73 13.53 13.06 0.01 14.91
28_10_5A 4.10 4.41 8.33 0.06 7.47
27_20_4_B 1.83 2.06 3.77 0.08 4.37
27_3_3B 4.77 4.77 9.55 0.01 9.81
30_22_4A 2.77 2.62 5.48 0.01 6.49
28_10_9B 3.84 3.90 7.71 0.03 7.42
28_12_1 4.83 4.65 9.59 0.02 7.89
30_21_1B 2.93 2.91 5.85 0.01 7.47
27_21_3A 5.80 5.13 11.31 0.09 16.3
28_10_6C 2.97 2.87 6.38 0.05 5.97
  1. As discussed in the section on microstructural characterization, crack densities were calculated on thin section samples to ascertain crack areas per unit volume using the optical microscope method (Underwood [1970]).