EGEL
Energy GeoEngineering Laboratory

Properties and phenonmena relevant to CH4-CO2 replacement in hydrate-bearing sediments

Properties and phenonmena relevant to CH4-CO2 replacement in hydrate-bearing sediments

​Jung, J. W., Espinoza, D., and Santamarina, J. C. (2010). "Properties and phenonmena relevant to CH4-CO2 replacement in hydrate-bearing sediments." Journal of Geophysical Research, Vol. 115
J. W. Jung, D. Nicolas Espinoza, and J. Carlos Santamarina
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2010
The injection of carbon dioxide, CO2, into methane hydratebearing sediments causes the release of methane, CH4, and the formation of carbon dioxide hydrate, even if global pressuretemperature conditions remain within the CH4 hydrate stability field. This phenomenon, known as CH4CO2 exchange or CH4CO2 replacement, creates a unique opportunity to recover an energy resource, methane, while entrapping a greenhouse gas, carbon dioxide. Multiple coexisting processes are involved during CH4CO2 replacement, including heat liberation, mass transport, volume change, and gas production among others. Therefore, the comprehensive analysis of CH4CO2 related phenomena involves physicochemical parameters such as diffusivities, mutual solubilities, thermal properties, and pressureand temperaturedependent phase conditions. We combine new experimental results with published studies to generate a data set we use to evaluate reaction rates, to analyze underlying phenomena, to explore the pressuretemperature region for optimal exchange, and to anticipate potential geomechanical implications for CH4CO2 replacement in hydratebearing sediments.