DENSITY CHANGE OF UNDERGROUND WATER DUE TO CO_2 DISSOLUTION

摘要

As a basic physical property for estimating the geophysical dynamics of injected CO_2 into reservoir waters, the density change of CO_2 underground water solution was experimentally investigated. It is found that, at pressure range from 10.0 to 20.0 MPa and temperature from 303.15 to 323.15 K, the density of CO_2 underground water solution increases with the increase of CO_2 concentration at the rate of 0.2g/cm~3, while decrease at the rate of -3.34E-4 g/cm~3/K with the increase of temperature. Regarding to the pressure, a linear increase rate of 5.0E-4 g/cm~3/MPa was observed.