Análise sísmica de cold seeps como zonas de prospecção na porção offshore da Bacia de Barreirinhas, Margem Equatorial Brasileira
The Brazilian Equatorial Margin (BEM) is an oblique-transform segment with counterparts in the Gulf of Guinea in West Africa. Both margins are inherited from the Pangea breakup and hence opening of the Equatorial Atlantic Ocean. These areas have been studied as new exploratory frontiers due to pe...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/51374 |
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| Resumo: | The Brazilian Equatorial Margin (BEM) is an oblique-transform segment with
counterparts in the Gulf of Guinea in West Africa. Both margins are inherited from the
Pangea breakup and hence opening of the Equatorial Atlantic Ocean. These areas have
been studied as new exploratory frontiers due to petroleum systems found in deep- and
ultra-deep waters. The Barreirinhas Basin, located at the central portion of the BEM, has
counterparts with the oil and gas producers Ivory Coast and Tano basins. Nevertheless, no
relevant reserves were identified in the Barreirinhas Basin yet, moreover due to the poor
study in respect to the petroleum systems. This present study aims to identify cold seeps
in shallow strata and associated with hydrocarbon migration, indicating possible
hydrocarbon accumulations along the offshore Barreirinhas Basin. Investigation was made
through conventional 2D seismic reflection in post-stack time migration with additional use
of seismic attributes. The results comprise the identification of cold seeps associated with
hydrocarbon migration, including leaking faults, gas chimneys, pockmarks, hydrocarbonderived diagenetic zone (HRDZ), bottom simulating reflectors (BSR), and deep-water
mounds. Regional morphologic and stratigraphic structures constrain the zones of cold
seep occurrences. In the eastern lower continental slope and continental rise, regional
normal faults control cold seep formation. On the central to northern sectors of the
continental rise and abyssal plain, several deep-water mounds are sourced by gas
chimneys and faults. Gravitational gliding systems are dominated by normal faults and
negative flower structures that produce cold seeps on proximal regions, defining the
extensional domain. These structural controls are related to the compressional domain of
the distal portion, where the decollement zones and series of faults and folds are
correlated to pockmarks and deep-water mounds. Near to the western compressional
domain, igneous intrusions control the development of leaking faults, gas chimneys, bright
spots, and pockmarks. These hydrocarbon-derived structures indicate potential petroleum
systems in the Albian to Turonian-Oligocene tectono-sedimentary sequences in the central
sector of the BEM. However, more refined techniques are needed to confirm the presence
of active hydrocarbon seepage and/or storage. Likewise, the Barreirinhas Basin can be a
vast field to the petroleum industry and scientific research, with the latter specially focusing
in the nature of the deep-water mounds, endowed of great potential for the geobiology. |
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