Montney Formation
| Montney Formation Stratigraphic range: Anisian |
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|---|---|
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| Type | Geological formation |
| Underlies | Doig Formation, Fernie Group |
| Overlies | Belloy Formation |
| Area | 130,000 square kilometres (50,190 sq mi) |
| Thickness | up to 280 metres (920 ft) |
| Lithology | |
| Primary | Siltstone and shale |
| Other | Dolomitic siltstone, sandstone |
| Location | |
| Coordinates | 56°34′18″N 121°13′19″W / 56.57159°N 121.2219°WCoordinates: 56°34′18″N 121°13′19″W / 56.57159°N 121.2219°W |
| Region | British Columbia, Alberta |
| Country |
 Canada
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| Type section | |
| Named for | Montney, British Columbia |
| Named by | J.H. Armitage, 1962 |
The Montney Formation is a stratigraphical unit of Lower Triassic age in the Western Canadian Sedimentary Basin in British Columbia and Alberta.
It takes the name from the hamlet of Montney and was first described in Texaco's Buick Creek No. 7 well by J.H. Armitage in 1962. The well was drilled 41 kilometers (25 mi) north of Fort St. John, immediately east of the Alaska Highway.
The formation is composed of siltstone and dark grey shale, with dolomitic siltstone in the base and fine grained sandstone towards the top. The facies is shaley in the north and west of the extent (Fort St. John), silty in the center (Dawson Creek and Pouce Coupe areas) and becomes coarser (sandy) in western Alberta (Valleyview area).
The Montney Formation is a major shale gas and shale oil resource. A comprehensive joint study on the potential of the Montney Formation was completed by the National Energy Board, British Columbia Oil and Gas Commission and the Alberta Energy Regulator in 2013. This study found that the potential resources contained within the formation were 449 trillion cubic feet of marketable natural gas, 14,521 million barrels of marketable natural gas liquids (NGLs) and 1,125 million barrels of oil. This estimate makes it one of the largest known gas resources in the world and equivalent to 145 years of Canada's 2012 consumption.
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