georefid:1999-051433SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1999-0514331998-01-01publicationgeorefid:1999-051433Collett, Timothy S.U. S. Geological Survey, Denver, CO, United StatesauthorSociety of Professional Well Log Analysts, Houston, TX, United StatespublisherdocumentHardcopyIn: Anonymous, Transactions of the SPWLA thirty-ninth annual logging symposium39MMThe amount of gas sequestered in gas hydrates is probably enormous, but estimates are highly speculative due to the lack of previous quantitative studies. Gas volumes that may be attributed to a gas hydrate accumulation within a given geologic setting are dependent on a number of reservoir parameters; one of which, gas-hydrate saturation, can be assessed with data obtained from downhole well logging devices. The primary objective of this study was to develop quantitative well-log evaluation techniques which will permit the calculation of gas-hydrate saturations in gas-hydrate-bearing sedimentary units. The "standard" and "quick look" Archie relations (resistivity log data) yielded accurate gas-hydrate and free-gas saturations within all of the gas hydrate accumulations assessed in the field verification phase of the study. Compressional wave acoustic log data have been used along with the Timur, modified Wood, and the Lee weighted average acoustic equations to calculate accurate gas-hydrate saturations in all of the gas hydrate accumulations assessed in this study. The well log derived gas-hydrate saturations calculated in the field verification phase of this study, which range from as low as 2% to as high as 97%, confirm that gas hydrates represent a potentially important source of natural gas.completedEconomic geology, geology of energy sourcesApplied geophysicsCentral AmericaDeep Sea Drilling ProjectDSDP Site 570East Pacificelectrical loggingformation evaluationgas hydratesGuatemalainterpretationIPODLeg 84mathematical modelsMiddle America Trenchnatural gasNorth PacificNorth SlopeNortheast PacificPacific CoastPacific Oceanpetroleumpetroleum explorationreservoir rockssedimentary rockswell-loggingurn:org.iodp:exp:84urnlargerWorkCitationcampaignurn:org.iodp:exp:84:site:570urnlargerWorkCitationstudyurn:org.iodp:exp:84urnlargerWorkCitationcampaignEnglishgeoscientificInformation-92.1500-88.150013.170717.4500Guatemala