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Fig. 3 | Geothermal Energy

Fig. 3

From: Economic and fault stability analysis of geothermal field development in direct-use hydrothermal reservoirs

Fig. 3

Mohr circles for a friction coefficient of 0.5 (black dashed line) showing the initial stress state (black circle) and the effective stress state (orange circle) with the pore pressure increase required for a critically dipping fault along the \(\sigma _{1}\)\(\sigma _{3}\) plane (a). Pore pressure increase required for a vertical fault to reach failure along the \(\sigma _{2}\)\(\sigma _{3}\) plane (b) and effect of thermal stresses for a laterally confined reservoir where the thermal stress acts on the horizontal components of the stress tensor with a \(\Delta\)T of 49.2 K and rock properties according to Table 3 (c). Pore pressure increase required to reach failure along the \(\sigma _{2}\)\(\sigma _{3}\) plane of a thermally stressed reservoir (d)

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