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Physical properties, including basic index properties, undrained shear strength, and thermal conductivities were measured on conventional cores retrieved from the Ulleung Basin, during the second Ulleung Basin Gas Hydrate expedition (UBGH2). The UBGH2 logged 13 sites and cored 10 sites to locate potential sites for an offshore test production. A total of 211 conventional cores were recovered. Undrained shear strength, thermal conductivity, and index properties, including porosity and grain density, were measured onboard. Mineral composition analyses and grain size analyses were completed onshore after the expedition.

The averaged porosity at each site ranges from 65% to 71%, the averaged grain density at each site ranges from 2.57 to 2.66 g/cm³, and the mean grain size mostly lies between 4 μm and 25 μm, with sparsely scattered coarse grained intervals. The relatively high porosity and low grain …