The Jureia Formation (Portuguese: Formacão Jureia) 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 with interbedded siltstones and fine sandstones formation dates to the Late Cretaceous period; Santonian-Maastrichtian epochs and has a maximum thickness of 2,000 metres (6,600 ft). The formation is a reservoir rock of the Merluza Field, the first discovery in the Santos Basin.
| Jureia Formation | |
|---|---|
| Stratigraphic range: Santonian-Maastrichtian ~ | |
| Type | Geological formation |
| Unit of | Frade Group |
| Underlies | Marambaia Formation |
| Overlies | Itanhaém Formation |
| Thickness | up to 2,000 m (6,600 ft) |
| Lithology | |
| Primary | Shale |
| Other | Siltstone, 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 | Jureia-Itatins Ecological Station |
 Location of the Santos Basin | |
Etymology
editThe formation is named after the Jureia-Itatins Ecological Station, São Paulo.
Description
edit
The Jureia Formation is 952 to 2,000 metres (3,123 to 6,562 ft) thick,[1] and includes a succession of clastics between the coarse facies of the Santos Formation in the western proximal part and the fine-grained clastics of the Itajai-Açu Formation in the eastern distal part of the Santos Basin. The formation is characterized by dark grey to greenish and brown shales, dark grey siltstones, fine-very fine sandstones and light ochre calcisilts. The depositional environment is thought to be of a marine platform setting as pro-delta facies on the shelf edge.[2] The age based on palynomorphs and calcareous nannofossils is Late Cretaceous (Santonian-Maastrichtian).[3] Two new ostracod species were identified in the drilling cuttings of wells drilled into the Santonian-Campanian section, ?Afrocytheridea cretacea and Pelecocythere dinglei.[4]
The formation is the reservoir rock of the Merluza Field, the first discovery in 1979 of the Santos Basin.[5][6]
See also
edit
References
edit- ^ Kiang Chang et al., 2008, p.32
- ^ Contreras, 2011, p.104
- ^ Clemente, 2013, p.23
- ^ Piovesan, 2010, p.177
- ^ "Santos Basin Fields". Archived from the original on 2017-09-07. Retrieved 2017-09-07.
- ^ Vieira, 2007, p.19
Bibliography
edit- Clemente, Pilar (2013), Petroleum geology of the Campos and Santos basins, Lower Cretaceous Brazilian sector of the South Atlantic margin, Danmarks Tekniske Universitet, pp. 1–33, retrieved 2017-09-04
- Contreras, Jorham (2011), Seismo-stratigraphy and numerical basin modeling of the southern Brazilian continental margin (Campos, Santos, and Pelotas basins) (PhD thesis) (PDF), Ruprecht-Karls-Universität Heidelberg, pp. 1–171, retrieved 2017-09-04
- Kiang Chang, Hung; Assine, Mario Luis; Santos Corrêa, Fernando; Setsuo Tinen, Julio; Campane Vidal, Alexandre; Koike, Luzia (2008), "Sistemas petrolíferos e modelos de acumulação de hidrocarbonetos na Bacia de Santos" (PDF), Revista Brasileira de Geociências, 38: 29–46, doi:10.25249/0375-7536.2008382S2946 (inactive 1 November 2024), retrieved 2017-09-04
{{citation}}: CS1 maint: DOI inactive as of November 2024 (link) - Piovesan, Enelise Katia; Trescastro Bergue, Cristianini; Fauth, Gerson (2010), "New ostracode species from the Upper Cretaceous of the Santos Basin, Brazil" (PDF), Revista Brasileira de Paleontologia, 13 (3): 175–180, doi:10.4072/rbp.2010.3.02, retrieved 2017-09-04
- Vieira, Juliana (2007), Brazil Round 9 - Santos Basin (PDF), ANP, pp. 1–73, retrieved 2017-09-04 Archived 2017-02-03 at the Wayback Machine