Аннотация
Dissolution and precipitation of silica polymorphs
(amorphous silica, cristobalite and quartz) were incorporated into a geothermal reservoir simulator based on reaction
kinetics. We simplified the reaction kinetics as silica minerals
being always precipitated from or dissolved into the neutral
dilute solution without a direct solid phase transition among
them. Based on this assumption and published experimental
data of rate constants and solubilities of silica minerals, three
dimensional numerical simulations of geothermal system
development were performed. Alteration zoning of silica
minerals was reproduced in the simulations as observed in
natural geothermal systems, and we examined the relation of
the silica alteration zoning to the thermal and hydrological
structure of the geothermal system.
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