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Figure 3 | Geothermal Energy

Figure 3

From: The significance of hydrothermal alteration zones for the mechanical behavior of a geothermal reservoir

Figure 3

SCCL for the wells GPK1 to GPK4. The SCCL is created on spectral gamma ray and the corrected fracture density log. FZXXXX denotes fracture zones after their depth of occurrence. Level 1 flowing fractures: major fracture zones with significant mud losses during stimulation, primary permeable. Level 2 flowing fractures: >20% water losses during stimulation. Level 3 flowing fracture: small fracture zones with <20% water loss (classification after Dezayes et al. [2010]). Higher SCCL indicates higher clay contents with SCCL = 1 representing no clay and SCCL = 5 representing the maximum density of clay-filled fractures.

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