Field Scale Simulation for Effect of Permeability Distribution and Anisotropy on Dissociationand Gas Production Behavior in Marine Sediments with Gas Hydrate

摘要

We have developed a field scale simulator to analysis the physicalphenomena in methane hydrate reservoir and predict gas productionbehavior in the process of hydrate dissociation. Absolute permeabilityand relative permeability with hydrate formation were formulated withmeasuring data and introduced into the simulator. Based on theexperimental results in laboratory for hydrate dissociation by hot waterinjection, the validity of the simulator was demonstrated. Using thissimulator, some field scale simulation run for hot water injection as athermal stimulation methods was carried out to consider the effect ofpermeability distribution and anisotropy on dissociation and gasproduction behavior. From calculation results, it was found that 1) highpermeable zone was formed in the reservoir, 2) injected water flew inthis zone, so that dissociation was promoted, depending on the theseparameters.