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Table 2 Structural analysis of the GRT-2 granitic basement with the caliper

From: How do the geological and geophysical signatures of permeable fractures in granitic basement evolve after long periods of natural circulation? Insights from the Rittershoffen geothermal wells (France)

GRT-2 Corrected caliper Acoustic image logs Accuracy
Density (fract/m) Dip direction Density (fract/m) Dip direction Dip direction dip
Set 1 Set 2 Set 1 Set 2
ZONE 1: 38 m (2196–2227 m TVD) 0.2 N274°E N61°E 0.6 N263°E N74°E ± 11° ± 5°
ZONE 2: 60 m (2360–2409 m TVD) 0.3 N272°E N70°E 0.9 N265°E N81°E ± 9° ± 13°
ZONE 3: 40 m (2472–2504 m TVD) 0.15 N52°E No data ± 10 ± 9°
ZONE 4: 40 m (2504–2535 m TVD) 0.17 N80°E No data
  1. Comparison of the structural analyses and their accuracies as calculated from the caliper and acoustic image logs (zones 1 and 2). Structural analysis from caliper data only (zones 3 and 4)