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Title: Palaeontological framework from Pirabas Formation (North Brazil) used as potential model for equatorial carbonate platform
Author: Aguilera, Orangel
Oliveira de Araújo, Olga M.
Hendy, Austin
Nogueira, Anna A.E.
Nogueira, Afonso C.R.
Maurity, Clovis Wagner
Kutter, Vinicius Tavares
Martins, Maria Virgínia Alves
Coletti, Giovanni
Dias, Bruna Borba
da Silva-Caminha, Silane A.F.
Jaramillo, Carlos
Bencomo, Karen
Lopes, Ricardo Tadeu
Keywords: Marine fossil
Western atlantic
Carbonate platform
Micro CT
Issue Date: Jan-2020
Publisher: Elsevier
Abstract: 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.
Peer review: yes
DOI: 10.1016/j.marmicro.2019.101813
ISSN: 0377-8398
Appears in Collections:DGeo - Artigos
GeoBioTec - Artigos

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