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dc.contributor.authorPortnov, Alexey
dc.contributor.authorCook, A.E.
dc.contributor.authorVadakkepuliyambatta, Sunil
dc.date.accessioned2021-08-24T07:08:48Z
dc.date.available2021-08-24T07:08:48Z
dc.date.issued2021-08-12
dc.description.abstractIn marine basins, gas hydrate systems are usually identified by a bottom simulating reflection (BSR) that parallels the seafloor and coincides with the base of the gas hydrate stability zone (GHSZ). We present a newly discovered gas hydrate system, Moby-Dick, located in the Ship Basin in the northern Gulf of Mexico. In the seismic data, we observe a channel-levee complex with a consistent phase reversal and a BSR extending over an area of ∼14.2 km2 , strongly suggesting the presence of gas hydrate. In contrast to classical observations, the Moby-Dick BSR abnormally shoals 150 m toward the seafloor from west to east, which contradicts the northward-shallowing seafloor. We argue that the likely cause of the shoaling BSR is a gradually changing gas mix across the basin, with gas containing heavier hydrocarbons in the west transitioning to methane gas in the east. Our study indicates that such abnormal BSRs can be controlled by gradual changes in the gas mix influencing the shape of the GHSZ over kilometers on a basin scale.en_US
dc.identifier.citationPortnov AD, Cook, Vadakkepuliyambatta S. Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico. Geology. 2021;49en_US
dc.identifier.cristinIDFRIDAID 1927030
dc.identifier.doi10.1130/G49310.1
dc.identifier.issn0091-7613
dc.identifier.issn1943-2682
dc.identifier.urihttps://hdl.handle.net/10037/22219
dc.language.isoengen_US
dc.publisherGeological Society of Americaen_US
dc.relation.journalGeology
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright © 2021 Geological Society of Americaen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleDiverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexicoen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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