MODELLING TWO-PHASE FRACTURE FLOW ABOVE A DIORITE INTRUSION

摘要

A model is presented of a hydrothermal reservoir containing a reactive fluid dominated by CO_2. A pulse of magmatic vapour is injected into the base of this reservoir, and the changed chemical and physical conditions calculated as the reservoir is allowed to evolve for 15,000 years. The chemistry in the reservoir is described by twelve component species, H_2O, H~+ , Cl~-, SO_4~= , HCO_3~-, HS~- , SiO_2, Al~(+++) , Ca~(++) , K~+ , Fe~(++) and Na~+. Associated with these components are 32 secondary species, nine minerals and two gases.