1887

Abstract

Summary

The Brazilian Equatorial Margin (BEM) offshore area comprises, from south to north, five large basins, named Potiguar, Ceará, Barreirinhas, Pará-Maranhão, and Foz do Amazonas. The basin boundaries were roughly based on onshore basement structures, but this definition does not match the current geological knowledge of the area. The current BEM geographic subdivision is considered obsolete.

We propose that new data, as potential and 3D seismic, allow to assign the role of the transform fault zones and minor offshore structures on the tectono-sedimentation control in the area. To corroborate the conception of tectonic drawers acting, this study present evidence as tectonic lineaments extracted from gravimetric maps; transcurrent character of fracture zones; presence of siliciclastic wedges in seismic sections; structural lineament maps for each drawer; and sedimentary thickness map.

Due to this fact, it seems more reasonable to consider as BEM limits, the transform fault zones, as the slides of tectonic drawers described above, from south to north: Ceará South/Potiguar Mar, Pará-Maranhão South/Barreirinhas/Ceará, and Foz Central/Pará-Maranhão North.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202380020
2023-08-15
2026-04-15

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References

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Low-Impact Broad-Band Seismic Sources: Field Data Performance and Monitoring
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202380020
/content/papers/10.3997/2214-4609.202380020
/content/papers/10.3997/2214-4609.202380020
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