Enhancement of Permeability Activated by Supercritical Fluid Flow through Granite

Figure 10

Relationship between the hydraulic conductivity and fracture density of the MIZ-1 borehole. The extents of four types of hydrothermal fluid fracture and a clay type are each surrounded by dotted and coloured boxes. Small numbers show the centre depth of each hydraulic test section. A schematic distribution of three representative types (sealing type, chlorite type, and sericite type) are shown on the right side. A weathered type was recognized as an outlier; this fracture probably experienced stress relief beneath the unconformity.