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Ulleung Basin Gas Hydrate Drilling Expeditions, Korea: Lithologic Characteristics of Gas Hydrate-Bearing Sediments

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World Atlas of Submarine Gas Hydrates in Continental Margins

Abstract

The Ulleung back-arc basin is a marginal sea, where mass-transport deposits (MTDs) and hemipelagic muddy sediments are intercalated with thin, sandy turbidites in the East Sea (Sea of Japan). Biogenic gas hydrates include pore-filling gas hydrates in silty and sandy sediments, as well as fracture-filling or massive gas hydrates in muddy sediments. These have been observed in all 13 cores taken from the 18 logging-while-drilling sites in a water depth of 897.9–2156.2 m. Pore-filling gas hydrates selectively occur in thin, sandy turbidite layers alternated with hydrate-free, muddy layers in which gas hydrate saturation increases with high sand contents. Fracture-filling and massive gas hydrates occur in hemipelagic muddy sediments within a columnar seismic blanking zone. The stacked MTDs play an important role in the upward migration of methane in the Ulleung back-arc basin. We present the lithologic characteristics of gas hydrate-bearing sediments based on multidisciplinary analyses of the first and second Ulleung Basin Gas Hydrate Drilling Expeditions (UBGH1 and 2) in 2007 and in 2010, respectively.

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Correspondence to Jong-Hwa Chun .

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Chun, JH., Bahk, JJ., Um, IK. (2022). Ulleung Basin Gas Hydrate Drilling Expeditions, Korea: Lithologic Characteristics of Gas Hydrate-Bearing Sediments. In: Mienert, J., Berndt, C., Tréhu, A.M., Camerlenghi, A., Liu, CS. (eds) World Atlas of Submarine Gas Hydrates in Continental Margins. Springer, Cham. https://doi.org/10.1007/978-3-030-81186-0_12

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