The Simulation Experiment of the Reactions between CO₂-rich Fluids and Rocks

Guoyong Liu, Basin & Reservoir Research Center, University of Petroleum, Changping, Beijing, P. R. China, 102249 [email protected]   [email protected]

In recent years, more and more CO₂-rich natural gases and CO₂-rich fluids have been found in nature. These CO₂ can constitute acidic fluids together with the water in sedimentary basin, which can react with the sedimentary mediums. These reactions can dissolve the cement and form secondary pores. In order to make known this effectiveness, we design a series of simulation experiments.

On the basis of extensive investigation and researches, we chose feldspar and quart as the experimental mineral. We chose Dongying Depression as our experimental in order to define the temperature and pressure of experiments.

After this, we put the samples into the airproof high-pressure kettle. For one sample, rise temperatures equably from 15℃ to 89℃ in 10 hours. Then keep the temperature for about 250 hours, and sampling every hour. This experiments aims to simulate the reactions of the low reaction zone. Then, for the same sample, add some CO₂ into the kettle to repeat the above experiments as the corresponding ones. Then substitute the temperature 135℃ for 89℃, and do the above two experiments again to simulate the reactions of the deep reaction zone.

Finally, we should do some geochemical analysis. For the same sample, we can contrast the productions with the one that the corresponding experiments produce. Through thorough analysis and systemic contrasts, we should make known how the CO₂ affects the physical characteristics of stratum in sedimentary basins.