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dc.contributor.authorNyamapfumba, Martinen_US
dc.contributor.authorMcMechan, George C.en_US
dc.date.accessioned2013-01-15T17:35:44Z
dc.date.available2013-01-15T17:35:44Z
dc.date.created2012-02-12en_US
dc.date.issued2012-09-26en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/2501
dc.description.abstractEvidence of gas hydrate and free gas occurrences in a 3D seismic volume from the West-Central Coastal Province of the Congo Fan, offshore Angola, illustrates all the components of a complete petroleum system. Analysis and interpretation are based on the information in attributes calculated from three 3D time-migrated common-angle seismic volumes; the attributes include seismic amplitude, spectral components, dip magnitude, amplitude variation with angle, and instantaneous frequency. The source is organic-rich muds associated with late Cretaceous to early Tertiary channels, the migration paths are along growth faults, and the traps are partly defined by the gas hydrate stability zone (for the gas hydrate), partly by the bottom-simulating reflector (for the subhydrate free gas), and partly by faults (for both). The spatial distribution of free gas is further supported by the associated seismic bright spots, and also by the attenuation of high frequencies of P-waves that traverse the gas-saturated zone. Locally higher temperatures, associated with upward fluid circulation along fault zones, facilitate gas transmission through the gas hydrate and forms gas chimneys that extend to the sea floor.en_US
dc.publisherSociety of Exploration Geophysicistsen_US
dc.relation.urihttp://dx.doi.org/10.1190/GEO2012-0048.1
dc.rights© 2012 Society of Exploration Geophysicists. All rights reserved.en_US
dc.sourceGeophysicsen_US
dc.subjectSeismic dataen_US
dc.subjectGeology--Angola--Congo Fanen_US
dc.subjectGas hydrateen_US
dc.subjectFree gasen_US
dc.titleGas hydrate and free gas petroleum system in 3D seismic data, offshore Angolaen_US
dc.typeTexten_US
dc.description.versionFinal published versionen_US
dc.type.genreArticleen_US
dc.identifier.bibliographicCitationNyamapfumba, Martin, and George A. McMechan. “Gas Hydrate and Free Gas Petroleum System in 3D Seismic Data, Offshore Angola.” Geophysics 77, no. 6 (Nov.-Dec. 2012): O55-O63.en_US
dc.contributor.utdAuthorMcMechan, George A.en_US


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