| Abstract |
The Pauzhetka hydrothermal system is located in a volcko-tectonic depression ne- active volcanic centers.Tem peratures at deptha of 300-800 m are 180-210?C. The natural discharge of the hydrothermal system includes the discharge of the Pauzhetka springs and a concealed discharge in the bed of the Pauzhetka River (95 &/a) and the eteam discharge in the Kambalny Ridge (15 kg/s). Only the upper part of geothermal reservoir was penetrated by drillholes (up to 1200 m), therefore we have used a mathematical modelling to assess the conditions of water and heat feeding of the hydrothermal system. The hydrothermal system belongs to alinear fracturing zone of NW trend, therefore the two-dimensional model was used in our calculations, It has been defined that 1) 5 e source of heating is a magma chamber located at a shallow depth, 2) The heat and mass transfer in the geothermal reservoir is defined by free and forced hydraulic convection, 3) 5 9 conductivity coefficient of a linear fracturing zone is 400-600 m2/day, ita width is 2 km and length is 10 Inn, 4) The water feeding is defined by infiltration in the recharge area. Calculations of temperature and velocity fields agree with real data ob= tained in the Pauzhetka geothermal area, therefore they may be a base f o r assessment of water and heat feeof the hydrothermal system. In accordance with these assessments1 the main part of water resources is derived from infiltration. Heat feeding may be maintained by cooling of the megma chamber with a volume of 18 Inn3 that is in accordance with the 'volume of Holocene igneous rocks. |