Caracterização tectono-deposicional do Alto de Tutóia na porção submersa da Bacia de Barreirinhas - Margem Equatorial do Brasil
The Barreirinhas Basin integrates a group of sedimentary basins belonging to the Brazilian Equatorial Margin. Its genesis is associated to the separation of the South American and African continents in the equatorial region of the Atlantic Ocean during the Early Cretaceous. This margin is governed b...
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| Formato: | bachelorThesis |
| 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/123456789/50568 |
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| Resumo: | The Barreirinhas Basin integrates a group of sedimentary basins belonging to the Brazilian Equatorial Margin. Its genesis is associated to the separation of the South American and African continents in the equatorial region of the Atlantic Ocean during the Early Cretaceous. This margin is governed by a mixed tectonic regime related to distensionary forces resulting from the rupture of the Pangea continent associated with shear forces, influenced by the Romanche Fracture Zone. The main structures that are inserted or limited by the Barreirinhas Basin are: the Parnaíba Platform and the Tutóia, Atlantic and Ceará Highs. The Tutoia High is recognized in the literature as an extensive anticlinal structure of NNE-SSW orientation that delimits the Piauí and Barreirinhas basins. Although some authors describe the architectural features of this segment, further investigation is still needed about the geological and geophysical characteristics that certify the understanding of its regional tectonic evolution, in the context of the opening of the continental margins of the Equatorial Atlantic. For this purpose, twenty-three 2D reflection seismic sections integrated with geophysical data from two wells were interpreted. The application of seismic attributes together with the color spectrum pointed out characteristics and patterns that highlighted structural features and allowed the interpretation of normal faults that delimit the Tutoia High to NNE-SSW as well as the identification of the anticlinal feature, in which the literature defines the Tutoia High, besides the presence of N-S semi-grabens that accompany its hinge zone to the central portion of the high. The highlighting of the seismic horizons also allowed for the interpretation of erosional discontinuities and truncations, which, by means of well-seismic tying, were interpreted as belonging to Maastrichtian tectonism. Three other horizons relating to the Aptian, Albian and Campanian, respectively, were also mapped. The integration of the geophysical data resulted in the construction of a simplified structural model characteristic of the main faults that delimit the Tutoia High in the Barreirinhas Basin. |
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