The Itanhaém Formation (Portuguese: Formacão Itanhaém) 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 shale formation with marls, siltstones and sandstones dates to the Early Cretaceous period; Early Albian epoch and has a maximum thickness of 1,500 metres (4,900 ft). The formation is the reservoir rock of the Tambaú Field in the Santos Basin.
| Itanhaém Formation | |
|---|---|
| Stratigraphic range: Early Albian ~ | |
| Type | Geological formation |
| Unit of | Camburi Group |
| Underlies | Itajaí-Açu Fm., Juréia Fm. |
| Overlies | Ariri Formation |
| Thickness | up to 1,500 m (4,900 ft) |
| Lithology | |
| Primary | Shale, siltstone, marl |
| Other | Sandstone |
| Location | |
| Coordinates | 26°6′S 43°43′W / 26.100°S 43.717°W |
| Region | Santos Basin, South Atlantic |
| Country |  Brazil |
| Type section | |
| Named for | Itanhaém |
 Location of the Santos Basin | |
Etymology edit
The formation is named after the town of Itanhaém, São Paulo.
Description edit
The Itanhaém Formation is 517 to 1,500 metres (1,696 to 4,921 ft) thick,[1] and consists of dark grey shales, siltstones and light grey marls, ochre-brown calcisilts and subordinated sandstones. These facies change laterally into the coarse clastics of the Florianópolis Formation. Facies analysis indicates a marine environment ranging from sub-littoral (inner neritic) and more rarely to pelagic (outer bathyal) conditions. The age based on planktonic foraminifera and pollen is Early Albian.[2]
The formation is the reservoir rock of the Tambaú Field in the Santos Basin.[3]
See also edit
References edit
Bibliography edit
- Clemente, Pilar. 2013. Petroleum geology of the Campos and Santos basins, Lower Cretaceous Brazilian sector of the South Atlantic margin, 1–33. Danmarks Tekniske Universitet. Accessed 2017-09-04.
- Kiang Chang, Hung; Mario Luis Assine; Fernando Santos Corrêa; Julio Setsuo Tinen; Alexandre Campane Vidal, and Luzia Koike. 2008. Sistemas petrolíferos e modelos de acumulação de hidrocarbonetos na Bacia de Santos. Revista Brasileira de Geociências 38. 29–46. Accessed 2017-09-04.
- Vieira, Juliana. 2007. Brazil Round 9 - Santos Basin, 1–73. ANP. Accessed 2017-09-04. Archived 2017-02-03 at the Wayback Machine