georefid:2009-038653SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2009-038653<gco:CharacterString>A preliminary study of gas hydrates in the Dongsha region, northern South China Sea</gco:CharacterString>2001-01-01publicationgeorefid:2009-038653Song HaibinChinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, ChinaauthorGeng JianhuaTongji University, ChinaauthorWang HowkingHamburg University, Federal Republic of GermanyauthorZhang WenshengChina Bureau of Oceanography, ChinaauthorFang YinxiaauthorHao TianyaoauthorJiang WeiweiauthorScience Press, Beijing, ChinapublisherdocumentHardcopyDiqiu Wulixue Bao = Acta Geophysica Sinica44 (5)687-695Using seismic, sonic logging and geothermal data, the distribution characteristics of gas hydrates in the Dongsha region in the north of the South China Sea were studied. Bottom simulating reflectors (BSR) and amplitude blanking zones were discovered in the seismic profiles. High-velocity intervals and velocity reversals were distinguished in the sonic logging curve. The BSR depth is compared with the thickness of the gas hydrate stability zone based on thermal gradient data. The depth of the BSR is in agreement with that obtained at ODP Sites 1144 and 1148, which are 654 and 475 meters below the sea floor, respectively. The top of the amplitude blanking zone may be related to gas hydrate-bearing strata in the region near ODP Site 1144 which is about 450 meters below the sea floor.completedEconomic geology, geology of energy sourcesApplied geophysicsacoustical loggingbottom-simulating reflectorsDongsha Risegas hydratesgeophysical methodsgeophysical profilesgeophysical surveysLeg 184natural gasNorth PacificNorthwest PacificOcean Drilling ProgramODP Site 1144ODP Site 1148offshorePacific Oceanpetroleumpetroleum explorationseismic methodsseismic profilesSouth China Seasurveyswell-loggingWest Pacificurn:org.iodp:exp:184urnlargerWorkCitationcampaignurn:org.iodp:exp:184:site:1144urnlargerWorkCitationstudyurn:org.iodp:exp:184urnlargerWorkCitationcampaignurn:org.iodp:exp:184:site:1148urnlargerWorkCitationstudyurn:org.iodp:exp:184urnlargerWorkCitationcampaignChinesegeoscientificInformation116.3356117.250818.501020.0311