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http://dx.doi.org/10.9719/EEG.2012.45.4.397

Relationships between Gas Hydrate Occurrence Types and Sediment Characteristics in the Ulleung Basin, East Sea  

Kim, Dae-Ha (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Bahk, Jang-Jun (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Jin-Heuck (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Ryu, Byong-Jae (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Ji-Hoon (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Chun, Jong-Hwa (Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Torres, Marta E. (College of Oceanic and Atmospheric Sciences, Oregon State University)
Chang, Chan-Dong (Dept. of Geology and Earth Environmental Sciences, Chungnam National University)
Publication Information
Economic and Environmental Geology / v.45, no.4, 2012 , pp. 397-406 More about this Journal
Abstract
During the 2nd Ulleung Basin Gas Hydrate Drilling Expedition (UBGH2) in 2010, gas-hydrate-bearing sediment cores were recovered at 10 drill sites. Base, on Infrared (IR) thermal image and grain-size analysis of the cores, three distinct types of gas hydrate are classified: Type I (fracture-filling in mud layers), Type II (disseminated in mud layers), and Type III (pore-filling in sand layers). Types I and II gas hydrates occur in mud as discrete veins, nodules or disseminated particles. Type III fills the pore spaces of the sand layers encased in mud layers. In this case, the sand content of hosting sediments shows a general linear relationship with gas hydrate saturation. The degrees of temperature anomalies (${\Delta}T$) from IR images generally increase with gas hydrate saturation regardless of gas hydrate occurrence types. Type I is dominantly found in the sites where seismic profiles delineate chimney structures, whereas Type II where the drill cores are composed almost of mud layers. Type III was mainly recovered from the sites where hemipelagic muds are frequently intercalated with turbidite sand layers. Our results indicate that gas hydrate occurrence is closely related to sedimentological characteristic of gas hydrate-bearing sediments, that is, grain size distribution.
Keywords
gas hydrate occurrence type; sediment grain size; gas hydrate saturation;
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