Chipaque Formation
| Chipaque Formation Stratigraphic range: Cenomanian-Turonian ~97–90 Ma |
|
|---|---|
| Type | Geological formation |
| Unit of | Villeta Group |
| Underlies |
Guadalupe Gp Arenisca Dura Fm |
| Overlies | Une Formation |
| Thickness | up to 1,700 metres (5,580 ft) |
| Lithology | |
| Primary | Organic shale |
| Other | Sandstone, limestone, siltstone |
| Location | |
| Coordinates | 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°WCoordinates: 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W |
| Region |
Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |
 Colombia
|
| Type section | |
| Named for | Chipaque |
| Named by | Hubach |
| Location | Chipaque |
| Year defined | 1957 |
| Coordinates | 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W |
| Region | Cundinamarca, Boyacá |
| Country |
Colombia
|
| Thickness at type section | 1,027 metres (3,370 ft) |
 Paleogeography of Northern South America 90 Ma, by Ron Blakey |
|
The Chipaque Formation (Spanish: Formación Chipaque, K2cp, Kc) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly organic shale formation dates to the Late Cretaceous period; Cenomanian-Turonian epochs and has a maximum thickness of 1,700 metres (5,600 ft). The formation, rich in TOC, is an important oil and gas generating unit for the giant oilfields Cupiagua and Cusiana of the Eastern Ranges as well as in the Llanos Orientales.
The formation was named in 1931 as group and as formation in 1957 by Hubach after Chipaque, Cundinamarca.
The Chipaque Formation with a maximum thickness of 1,700 metres (5,600 ft), is characterised by a sequence of pyritic organic shales, limestones and siltstones, with sandstone banks intercalated in the formation. The Chipaque Formation contains a high density of fauna. The formation is rich in TOC and one of the principal source rocks for oil and gas generation in the foothills of the Eastern Ranges, sourcing fields as Cusiana, Cupiagua and many others. Chipaque also sourced the oilfields of the Llanos Orientales. In the Chitasugá-1 well, drilled between 1980 and 1981, from the sandstones of the Chipaque Formation half a million m³ of water were produced. The sandstone beds are reservoir rocks for oil in the Eastern Ranges.
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Wikipedia