georefid:2005-053912SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1021/ef049798o<gco:CharacterString>Global distribution of methane hydrate in ocean sediment</gco:CharacterString>2005-01-01publicationgeorefid:2005-053912doi:10.1021/ef049798oKlauda, Jeffrey B.University of Delaware, Department of Chemical Engineering, Newark, DE, United StatesauthorSandler, Stanley I.authorAmerican Chemical Society, Washington, DC, United StatespublisherdocumentDigitalEnergy & Fuels19 (2)459-470In this paper, we present an equilibrium thermodynamic model to accurately predict the maximum depth of hydrate stability in the seafloor, including the effects of water salinity, hydrate confinement in pores, and the distribution of pore sizes in natural sediments. This model uses sediment type, geothermal gradient, and seafloor depth as input to predict the thickness of the hydrate zone. Using this hydrate model and a mass-transfer description for hydrate formation, we have also developed a predictive method for the occurrence of methane hydrates in the ocean. Based on this information, a prediction for the distribution of methane hydrate in ocean sediment is presented on a 1 degrees latitude by 1 degrees longitude (1 degrees X1 degrees ) global grid. From this detailed prediction, we estimate that there is a total volume of 1.2X10 (super 17) m (super 3) of methane gas (expanded to atmospheric conditions), or, equivalently, 74 400 Gt of CH (sub 4) in ocean hydrates, which is 3 orders of magnitude larger than worldwide conventional natural gas reserves. Of this number, we estimate that 4.4X10 (super 16) m (super 3) of methane expanded to standard temperature and pressure (STP) exists on the continental margins.completedEconomic geology, geology of energy sourcesOceanographyaliphatic hydrocarbonsalkaneschemical compositioncontinental marginequationsgas hydratesgeochemistrygeothermal gradientheat flowhydrocarbonslatitudeLeg 164marine geologymarine sedimentsmass transfermathematical methodsmethanemodelsnatural gasOcean Drilling Programocean floorsODP Site 994ODP Site 995ODP Site 997organic compoundsP-T conditionspetroleumpetroleum explorationphase equilibriaphysical propertiesporositypredictionreservessea watersedimentsthermodynamic propertiestotal organic carbonworld oceanurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:994urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:995urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:997urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignEnglishgeoscientificInformation-75.3245-75.280731.470831.5035application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://pubs.acs.org/userimages/ContentEditor/1233859195915/enfuem-eab.pdfdownload