Evolution characteristics of pure water resistance and conductance under deep supercritical geothermal conditions
The resistance of pure water was measured under 300～500 ℃ and 30～50 MPa to illuminate the evolution characteristics of pure water resistance and conductance from the subcritical to supercritical conditions.Furthermore,the evolution mechanism of the resistance and conductance with temperature and pressure is interpreted.The results indicate that the pure water conductance fluctuates near the supercritical point(374 ℃,22.1 MPa),which is as follows:(1)the conductance in the subcritical region has positively correlated with temperature,which is caused by the sum of the ultimate equivalent conductance of H+and OH-increasing with the increase of temperature;(2)the conductance has a negative correlation with temperature after entering the supercritical region,which is caused by the decrease of the density and ion product of water with the increase in temperature.In addition,there is a positive correlation between conductance and pressure at a constant temperature.This study provides basic data for geophysical exploration and interpretation of deep supercritical geothermal resources.
Supercritical geothermalHigh temperature and pressureResistanceElectric conductanceHydrothermal experiment
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