| Keg River Formation Stratigraphic range: Givetian |
|
|---|---|
| Type | Geological formation |
| Underlies | Muskeg Formation |
| Overlies | Chinchaga Formation |
| Thickness | up to 300 metres (980 ft)[1] |
| Lithology | |
| Primary | Dolomite, limestone |
| Location | |
| Named for | Keg River |
| Named by | J. Law, 1955 |
| Region | Alberta |
| Country | Canada |
The Keg River Formation is a stratigraphical unit of Givetian age in the Western Canadian Sedimentary Basin.
It takes the name from the Keg River, a tributary of the Peace River, and was first described in the California Standard Steen River 2-22-117-5W6M well (situated north of Zama Lake) by J. Law in 1955.
Contents |
The Keg River Formation is composed of dark dolomite with intercrystalline or vuggy porosity and wackestone limestone. [1] The Rainbow Member and upper Keg River Member are reef formations deposited in the Rainbow, Zama and Bitscho sub-basins.
Oil is produced from the Keg River reefs in the Zama Lake and Rainbow Lake areas of north-western Alberta.
The Keg River Formation occurs in the sub-surface from north-eastern to north-western Alberta and its sothern border is defined by the Peace River Arch. It varies in depth from 10 metres (30 ft) to 300 metres (980 ft).[1]
The Keg River Formation is conformably overlain by the Muskeg Formation and unconformably overlays the Chinchaga Formation.[1]
It is equivalent to the Pine Point Formation, Hume Formation and Nahanni Formation in north-eastern British Columbia and the Northwest Territories and to the Winnipegosis Formation in Saskatchewan and eastern Alberta.