This paper describes the development and implementation of a thermo-hydro-mechanical-chemical model for the simulations of the dissociation of methane hydrate. The governing equations for the conservation of energy (thermal), mass (hydraulic) and momentum (mechanical) were derived from the local balance equation. The proposed governing equation system for methane hydrate as a four-phase four-component composite was simplified based on reasonable assumptions to facilitate implementation. The dissociation reaction was considered using chemical kinetics. Auxiliary relationships were employed to mathematically close the formulation. The mathematical model was implemented using the finite element method. The simulation results were evaluated and compared with those obtained by conventional simulators for thermo-hydraulic modeling. The mechanical module was applied to evaluating geotechnical responses induced by gas recovery in a typical oceanic reservoir.
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