Patent ID: 8185314

Claim:
A method for determining dynamic permeability of gas hydrate formations by in-situ evaluation, comprising: deploying a tool within a wellhole configured for magnetic resonance measurements and measuring magnetic resonance porosities of a formation at multiple depths corresponding to different fluid saturations of a gas hydrate of interest in the formation; determining total formation porosities at the multiple depths; deriving gas hydrate saturations at the multiple depths from a difference between the corresponding total formation porosities and the magnetic resonance porosities at the multiple depths; determining magnetic resonance permeabilities at the multiple depths; determining permeability of the formation at or near zero saturation of the gas hydrate of interest; plotting the magnetic resonance permeabilities derived from multiple depths of investigation along the formation as a function of the gas hydrate saturations determined at the corresponding multiple depths; and using data obtained from plotting the magnetic resonance permeability as a function of the gas hydrate saturations as an input to a gas hydrate production simulator.