Spirit River Formation
| Spirit River Formation | |
|---|---|
| Stratigraphic range: middle Albian | |
 Falher graywake and shale | |
| Type | Geological formation |
| Unit of | Fort St. John Group |
| Sub-units | Notikewin Member, Falher Member, Wilrich Member |
| Underlies | Peace River Formation |
| Overlies | Bluesky Formation |
| Thickness | up to 348 feet (110 m)[1] |
| Lithology | |
| Primary | sandstone, shale, siltstone |
| Other | coal, ironstone, greywacke |
| Location | |
| Coordinates | 55°46′30″N 118°54′22″W / 55.775°N 118.906°W |
| Region |  Alberta,  British Columbia |
| Country |  Canada |
| Type section | |
| Named for | Spirit River |
| Named by | Badgley, 1952 |
The Spirit River Formation is a stratigraphical unit of middle Albian age in the Western Canadian Sedimentary Basin.
It takes the name from the Spirit River, and was first described in Imperial Oil Spirit River No. 1 well by Badgley in 1952.[2]
Lithology
The Spirit River Formation consists, from bottom to top of fine to medium grained argillaceous sandstone, dark shale, ironstone, greywacke, shale, siltstone, coal and dark shale with thin sandstone and siltstone stringers.[1]
Hydrocarbon production
Gas is produced from channels developed in the Falher Member in northern Alberta.
Distribution
The Spirit River Formation reaches a maximum thickness of 348 metres (1,140 ft). It is found in the sub-surface in the Peace River Country, in an area stretching from Fort St. John, British Columbia to the Lesser Slave Lake from west to east, and from Grande Prairie, Alberta to Manning, Alberta from south to north.
Relationship to other units
The Spirit River Formation is conformably overlain by the Peace River Formation and conformably underlain by the Bluesky Formation. It grades laterally to the Buckinghorse Formation shales to the north-east, and into the sandy facies of the Malcolm Creek Formation south of the Wapiti River. It is equivalent to the upper Mannville Formation in Central Alberta and to the Clearwater Formation and Grand Rapids Formation in the upper Athabaska River area.[1]
Subdivisions
The Spirit River Formation is composed of the following sub-divisions from base to top:
| Sub-unit | Lithology | Max Thickness |
Reference |
|---|---|---|---|
| Notikewin Member | fine to medium grained argillaceous sandstone, dark shale, ironstone | 28 metres (90 ft) | [3] |
| Falher Member | greywacke, shale, siltstone, coal | 215 metres (710 ft) | [4] |
| Wilrich Member | dark shales thin sandstone and siltstone stringers | 154 metres (510 ft) | [5] |
References
- ^ a b c Lexicon of Canadian Geologic Units. "Peace River Formation". Retrieved 2009-02-11.
- ^ Badgley, Peter C., 1952. Notes on the subsurface stratigraphy and oil and gas geology of the Lower Cretaceous series in central Alberta (Report and seven figures); Geological Survey of Canada, Paper No. 52-11, 12 p.
- ^ Lexicon of Canadian Geologic Units. "Notikewin Member". Retrieved 2009-02-11.
- ^ Lexicon of Canadian Geologic Units. "Falher Member". Retrieved 2009-02-11.
- ^ Lexicon of Canadian Geologic Units. "Wilrich Member". Retrieved 2009-02-11.
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