Modelling Studies of the Evolution of Vapour-Dominated Geothermal Systems
Numerical experiments, based on linear stability results, are invoked to model the evolution of two-phase vapor-dominated zones within geothermal systems. A reservoir model with all boundaries impermeable to fluid flow and a uniform heat flux at the bottom boundary is used. The results obtained show that different steady-states are accessible along different quasi-static paths from the same initial vapor-dominated steady-state. Thus, the realization of a steady-state with a two-phase vapor-dominated zone overlying a single-phase hot water region can indicate that the geothermal system undergoes a process of slow cooling. A steady-state with a two-phase vapor-dominated zone overlying a single-phase vapor region can be formed either as a result of slow heating or as a result of a reduction in permeability. A steady-state with an upper vapor-dominated part and a lower liquid-dominated part can occur if permeability of the system has been gradually increased.
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- Resource Type:
- Technical Report
- Research Org:
- Mathematics Dept., Victoria University of Wellington, Wellington, NZ
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- Country of Publication:
- United States
- 15 GEOTHERMAL ENERGY; FLUID FLOW; GEOTHERMAL SYSTEMS; HEAT FLUX; HEATING; HOT WATER; PERMEABILITY; SIMULATION; STABILITY; Geothermal Legacy
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