Guarujá Formation

The Guarujá Formation (Portuguese: Formacão Guarujá) is a geological formation of the Santos Basin offshore of the Brazilian states of Rio de Janeiro, São Paulo, Paraná and Santa Catarina. The predominantly calcarenite formation with marls dates to the Early Cretaceous period; Early Albian epoch and has a maximum thickness of 2,500 metres (8,200 ft). The formation is the second-most important post-salt reservoir rock of the Santos Basin.

Guarujá Formation
Stratigraphic range: Early Albian
~113–108 Ma
↓
TypeGeological formation
Unit ofCamburi Group
UnderliesItajaí-Açu Fm., Juréia Fm.
OverliesAriri Formation
Thicknessup to 2,500 m (8,200 ft)
Lithology
PrimaryLimestone
OtherMarl
Location
Coordinates26°6′S 43°43′W
RegionSantos Basin, South Atlantic
Country Brazil
Type section
Named forGuarujá

Location of the Santos Basin

Etymology

The formation is named after the city of Guarujá, São Paulo.

Description

The Guarujá Formation is 832 to 2,500 metres (2,730 to 8,202 ft) thick,[1] and consists of oolitic calcarenites, which laterally grade to greyish ochre and brownish grey calcilutites and grey marls. These facies are interbedded with the alluvial clastics of the Florianópolis Formation. The Guarujá name is restricted to the lowest limestone intercalation, previously named Lower Guarujá by Ojeda and Ahranha in Pereira and Feijó (1994). The microfacies indicate a tidal flat to shallow lagoon and open carbonate platform depositional environment. The age based on planktonic foraminifera and pollen is Early Albian.[2]

Petroleum geology

The formation is the second-most important post-salt reservoir rock of the Santos Basin,[3] after the Itajaí-Açu Formation.[4][5]

Field Year Operator Reserves (in place, million barrels) Reserves (in place, million m3)
Notes
Cavalo Marinho2001Petrobras25.04 3.981
[4][6]
Caravela1992Petrobras48.81 7.760
[4][7]
Caravela Sul1991Petrobras5 0.79
[4]
Coral1990Petrobras22.57 3.588
[4][8]
Estrela do Mar1990Petrobras15.16 2.410
[4][9]
Tubarão1988Petrobras30 4.8
[10]
gollark: Unless you count the hardcoded digits of Tau.
gollark: PotatOS is several thousand lines of cryptic incomprehensible code and doesn't include trigonometry anywhere!
gollark: No use randomly writing mathematical code for a random platform when I have no idea what to do with it.
gollark: I don't see why I would want that, and that's not listed, but I imagine you could implement it.
gollark: <@201096871341588480> Actually, I might as well just link you the docs, this lists all the stuff it can do in MicroPython: https://microbit-micropython.readthedocs.io/en/v1.0.1/microbit_micropython_api.html

See also

References
  1. Kiang Chang et al., 2008, p.32
  2. Clemente, 2013, p.22
  3. Contreras, 2011, p.34
  4. "Santos Basin Fields". Archived from the original on 2017-09-07. Retrieved 2017-09-07.
  5. Vieira, 2007, p.9
  6. Juarez, 2013, p.14
  7. ANP Yearbook, 2014, p.30
  8. Coral Field: Case History in Oil Producing Albian Carbonates in Santos Basin, Brazil
  9. Estrela do Mar, Cavalo Marinho oil output by 2007
  10. Juarez, 2013, p.11

Bibliography
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