Article Dans Une Revue Marine Micropaleontology Année : 2020

Palaeontological framework from Pirabas Formation (North Brazil) used as potential model for equatorial carbonate platform

Orangel Aguilera
  • Fonction : Auteur
Olga Oliveira de Araújo
  • Fonction : Auteur
Austin Hendy
  • Fonction : Auteur
Anna A.E. Nogueira
  • Fonction : Auteur
Afonso C.R. Nogueira
  • Fonction : Auteur
Clovis Wagner Maurity
  • Fonction : Auteur
Vinicius Tavares Kutter
  • Fonction : Auteur
Maria Virgínia Alves Martins
  • Fonction : Auteur
Giovanni Coletti
  • Fonction : Auteur
Bruna Borba Dias
  • Fonction : Auteur
Silane A.F. da Silva-Caminha
  • Fonction : Auteur
Karen Bencomo
  • Fonction : Auteur
Ricardo Tadeu Lopes
  • Fonction : Auteur

Résumé

The Pirabas Formation (early to middle Miocene) from the equatorial margin of North Brazil is characterized by a shallow-marine carbonate platform with high fossil diversity and abundant micro- and macrofossil remains. The Pirabas Formation represents a unique carbonate system along the Atlantic margin of South America that developed before the onset of the Amazon delta. We studied the palaeontology and lithofacies of outcrops of the uppermost Pirabas Formation and found that was deposited in a coastal marine environment with marginal lagoons under the influence of a tidal regime and tropical storms. The remains of calcareous algae, molluscs, crustaceans, echinoiderms, bryozoans, solitary corals, fish and marine mammals, together with foraminifera, ostracods and other marine microfossils, shaped a biogenic framework, that together with the post-depositional processes of dissolution of skeletal grains, is responsible for the mean packstone-floatstone porosity of 14.9%. The palaeontological framework and the petrophysical characterization of the carbonate rocks from the uppermost Pirabas Formation outcrop represent a baseline to interpret the entire Pirabas Formation in the subsurface stratigraphic sections (cores) of this important Neogene unit. Considering that carbonate rocks account for ~50% of oil and gas reservoirs around the world, this research provides a model for Neogene tropical carbonate deposits useful for carbonate petroliferous reservoirs in the Brazilian equatorial basins.
Fichier non déposé

Dates et versions

hal-04900665 , version 1 (20-01-2025)

Identifiants

Citer

Orangel Aguilera, Olga Oliveira de Araújo, Austin Hendy, Anna A.E. Nogueira, Afonso C.R. Nogueira, et al.. Palaeontological framework from Pirabas Formation (North Brazil) used as potential model for equatorial carbonate platform. Marine Micropaleontology, 2020, 154, pp.101813. ⟨10.1016/j.marmicro.2019.101813⟩. ⟨hal-04900665⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More