Methane-dominated gas hydrates deposits are considered as a potential hydrocarbon resource and storage medium for anthropogenic CO2 by gas replacement. We establish Raman spectroscopy as a quantitative tool to determine the composition of mixed gas hydrates. Using our empirical ratios of Raman quantification factors, the cage occupancies, the bulk guest composition and hydration number of gas hydrates containing CH4, C2H6, CO2 and N2 molecules can be determined. In this way, we can gain insight into details of the CH4 exchange reaction with CO2 or CO2 + N2 and the preference of certain gas species for certain types of hydrate cages.

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