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Geothermal Energy

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Table 2 Calculated linear fracture frequency for three intervals in FFC-1

From: Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

Borehole depth

Interval thickness

Number of fractures

Linear fracture frequency, frac/m

Volumetric fracture density, m2/m3

2150–2450 m

300 m

No reliable data

–

–

2450–2562 m

112 m

181

1.62

2.67

2562–2695 m

133 m

329

2.49

3.39

2695–3106 m

411 m

353

0.85

1.68

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