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TitreGas hydrate occurrences and their relation to hosting sediment properties: results from UBGH2, East Sea
AuteurBahk, J J; Chun, J H; Kim, D H; Kim, J H; Torres, M E; Schultheiss, P; Ryu, B J; Collett, T S; Riedel, M
SourceProceedings of the 7th International conference on gas hdyrates (ICGH 2011); 2011, 8 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110044
Réunion7th International conference on gas hdyrates (ICGH 2011); Edinburgh; GB; juillet 17-21, 2011
Lat/Long OENS 130.0000 132.5000 37.5000 35.5000
Sujetshydrocarbures; capacité de production d'hydrocarbures; hydrate; sédiments marins; sédiments marins; milieux marins; analyses granulométriques; combustibles fossiles; géologie marine
Illustrationslocation maps; tables; plots; photographs
ProgrammeHydrates de gaz, Caractérisation des Hydrates de gaz
Résumé(disponible en anglais seulement)
The 2nd Ulleung Basin Gas Hydrate Expedition (UBGH2) recovered various types of gas-hydrate bearing sediments from 10 drill sites in the lower slope and basin floor of the Ulleung Basin, East Sea of Korea. To detail the gas-hydrate occurrences and properties of hosting sediments, wholeround core samples taken from cold regions of catwalk infrared (IR) scan were further characterized by a variety of shipboard experiments such as imaging of liner-opened sediments with hand-held IR and visual camera, separate measurements of pore water chlorinity within and around IR cold regions and grain-size analysis of pore water squeeze cakes. Mineral compositions of selected samples were further characterized by X-ray diffraction and microscopic observations during the post-cruise analysis. The onboard and post-cruise analysis results collectively indicate that the recovered gas hydrates mainly occur as "pore-filling" type bounded by discrete sandy layers and "fracture-filling" layered and nodular or "disseminated" type in mud without apparent lithologic boundaries. In addition, minor but significant variation was also observed in some diatomaceous mud where gas hydrates occur as "pore-filling" type bounded by subtle compositional changes in mud. Together with precedent marine gas hydrate expeditions of the ODP/IODP, Indian NGHP, and UBGH1, the UBGH2 greatly improved understanding of lithologic controls on marine gas hydrate occurrences.