Studies on how the velocity of CO2 is affected by temperature and pressure are important for understanding seismic properties of fluid and rock systems with a CO2 component. We carried out laboratory experiments to investigate velocity of CO2 in temperatures ranging from 10°Cto200°C and pressures ranging from 7MPato100MPa, in which CO2 is in a liquid phase. The results show that under the above conditions, in general, the velocity of CO2 increases as pressure increases and temperature decreases. Near the critical point (31.1°C and 7.38MPa), the velocity of CO2 reaches a minimum and has a complicated behavior with temperature and pressure conditions due to the CO2 transition between gas and liquid phases. We also developed preliminary empirical models to calculate the velocity of CO2 based on newly measured data.

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