Core scale Evaluation Of Geomechanical Property Related To Gas Production From Gas Hydrate Deposits In The Ulleng Basin, East Sea, Korea

摘要

The production of natural gas from gas hydrate deposits poses chalenges such as assessing hydraterecovery rates from physical properties and geological structure of the hydrate reservoir, securing theeconomic viability of produced gas from a particular resource, and keeping process safe from geomechanicalimpacts from hydrate dissociation. The macro scale behavior of sediments during productionoperations, such as particle migration, fluid flow, and deformation behavior, is governed by particlecharacteristics, fabric formation environments, and the resulting fabrics. The geotechnical terms forcharacterizing the grain size distribution are useful tools for estimating geotechnical parameters in theabsence of an extensive set of the geotechnical laboratory experiments. In this manuscript, the grain sizedistributions of sediments from the Ulleung Basin will be utilized to characterize geomechanicalbehaviors induced by the production operations at gas hydrate-bearing sites in the Ulleung Basin, wherepore-filling GH have been found in the intercalated turbidite sands. According to the analyses on the grainsize distributions, the particle migration in coarse grained layers during production necessitates propermeasure for sand productions, while fine grained layers are mostly self-filtering. The hydraulic conductivityin pore-filling gas hydrate-bearing layers is relatively low in comparison with those from conventionalgas reservoirs, and the conductivities at layers above GH layers are low enough to function asbarriers.