STUDY UNDERGROUND OF CONTAINMENT AND LONG-TERM STORAGE OF CARBON-DIOXIDE IN UNUSED AQUIFERS - CHARACTERISTICS OF CARBON-DIOXIDE SOLUBILITY IN WATER

For the purpose of stabilizing CO2 in aquifers, CO2 solubility tests in water were carried out by changing the conditions of various parameters. The test results are summarized as follows: (1) The results of the CO2-H2O equilibrium tests are in good conformity with other literature. Therefore, these test results are considered reliable. (2) CO2-H2O equilibrium tests were carried out under the following conditions - Temperature 30 approximately 70-degrees-C - Pressure 25 approximately 200 ata. - Salt Content 0 approximately 2.7 wt. % - Methane Concentration in Gas Phase 0 approximately 75 mol. % Test Results CO2 solubility in water decreases as salt content increases. In the CO2-CH4-H2O equibrium tests, CO2 solubility in water changes in proportion to the gas phase CO2 partial pressure. Detailed tests under a wide range of parameter conditions are currently continuing.