Caracterização morfológica-sedimentar do vale inciso Apodi-Mossoró e plataforma continental adjacente - Bacia Potiguar Offshore
Systems of incised valleys have been studied in different continental shelves, including the Brazilian continental margin. The interest to characterize this feature is given by the information that it can provide variations on sea level, as well as the ability to host economically significant quan...
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| Huvudupphovsman: | |
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| Övriga upphovsmän: | |
| Materialtyp: | doctoralThesis |
| Språk: | por |
| Publicerad: |
Universidade Federal do Rio Grande do Norte
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| Ämnen: | |
| Länkar: | https://repositorio.ufrn.br/jspui/handle/123456789/19900 |
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| Sammanfattning: | Systems of incised valleys have been studied in different continental shelves, including the
Brazilian continental margin. The interest to characterize this feature is given by the information that it
can provide variations on sea level, as well as the ability to host economically significant quantities of
hydrocarbons in reservoirs located in deposits filling of the incised valleys. This thesis has the overall
objective to characterize the morphology and sedimentary cover of the incised valley Apodi-Mossoró,
located in the Northern Continental shelf of Rio Grande do Norte state, adjacent to Areia Branca city.
The methodology included the integration of satellite imagery, bathymetric data, sedimentological
data, shallow seismic, and the identification of foraminifera. The results indicate that the ApodiMossró
incised valley is currently formed by two channels, shallow channel and deep channel, which
have distinct morphological and sedimentological characteristics. The deep channel has connection
with one of the heads of the Apodi Canyon, located in the slope area. The acquisition, processing
and interpretation of shallow seismic data allowed the recognition of the depositional surface,
erosional surface, discordance, and sismofaceis. The erosional surface mapped from shallow seismic
sections is possibly a indicative of an ancient surface of valley incision, where it would probably be
associated with the limit Pleistocene/Holocene. Different sismofaceis were identified and reflect the
rise in sea level with standards sometimes agradacional, sometimes progradational. The thickness of
sediments on this surface was estimated at a maximum of 22m thick in the central portion of the
incised valley. Statistically, there are differences between the adjacent continental shelf and
channels, and between these channels, for the content of calcium carbonate, organic matter, sand
and mud perceptual, except for the gravel grain size. The analysis of living and dead foraminifera
showed the presence of fifty species distributed in regards to morphology, depth and type of
sediment. Four type of seismic echocharacteres were identified and mapped, as well as their
bedforms, indicating different sedimentary processes along the incised valley. The integration of
results suggests an activation of the Apodi-Mossoró incised valley in the Late Pleistocene. |
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