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TitreEvidence of gas hydrate from UBGH2 log data in the Ulleung Basin, East Sea
AuteurKim, G Y; Yoo, D G; Ryu, B J; Collett, T; Riedel, M; Kwak, J Y
SourceProceedings of the 7th International Conference on Gas Hydrates (ICGH 2011); 2011, 4 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090397
Réunion7th International Conference on Gas Hydrates (ICGH 2011); Edinburgh; GB; juillet 17-21, 2011
Lat/Long OENS-132.5000 -130.0000 37.5000 35.5000
Sujetshydrocarbures; capacité de production d'hydrocarbures; hydrate; sédiments marins; sédiments marins; milieux marins; analyses granulométriques; combustibles fossiles; géologie marine
Illustrationsphotographs; profiles
ProgrammeHydrates de gaz, Caractérisation des Hydrates de gaz
Résumé(disponible en anglais seulement)
The Gas Hydrate Research and Development Organization(GHDO) of Korea accomplished successfully the Korea Gas Hydrate Expedition 2010 in the Ulleung Basin(UBGH2), both coring (hydraulic piston and pressure coring) and logging(LWD: logging while drilling and WL: wireline logging), in order to investigate the distribution pattern of gas hydrate in the Ulleung Basin, the East Sea of Korea. The LWD data from 13 sites were obtained and most of the sites showed realistic log data indicating the presence of gas hydrate. In particular, the sites characterized by chimney structure showed extremely high resistivity and velocity relative to normal marine sediments. This suggests that massive hydrates exist into the sediment. The wireline logging(WL) for two sites was also performed. There are good correlations between LWD and WL data. Based on log data, the gas hydrate of the Ulleung Basin likely shows various occurring patterns such as vein/fracture filling type, strata-bound type, pore filling type, and massive type. This was directly identified from some evidence of dissociated hydrates and various hydrate samples collected from coring after LWD. LWD data also strongly support the interpretation for the seismic indicators (e.g., vent or chimney structures, strong BSR, acoustic blanking, enhanced reflection etc) which imply the probability
of hydrate presence.