Gas hydrates in reservoirs are generally not in thermodynamic equilibrium and there may be several competing phase<br>transitions involving hydrate. Formation of carbon dioxide hydrates during aquifer storage of carbon dioxide involves roughly<br>10% volume increase compared to groundwater. Dissociation of hydrate towards under saturated fluid phases involves the<br>same level of contraction. Hydrate phase transitions are generally fast (scales of seconds) compared to mineral dissolution and<br>precipitation and it is unlikely that a time shifted explicit coupling to geo mechanical analysis will be able to capture the<br>appropriate dynamic couplings between flow and changes in stress.


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