Doig Formation
| Doig Formation Stratigraphic range: middle Anisian to Ladinian |
|
|---|---|
| Type | Geological formation |
| Underlies | Halfway Formation |
| Overlies | Montney Formation |
| Thickness | up to 190 metres (620 ft) |
| Lithology | |
| Primary | Siltstone, Shale |
| Other | Phosphate, Sandstone |
| Location | |
| Coordinates | 56°34′18″N 121°13′19″W / 56.57159°N 121.2219°W |
| Region | NW  AlbertaNE  British ColumbiaSE  Yukon
|
| Country |
 Canada
|
| Type section | |
| Named for | Doig River |
| Named by | J.H. Armitage, 1962 |
The Doig Formation is a stratigraphical unit of middle Triassic age in the Western Canadian Sedimentary Basin.
It takes the name from Doig River, a tributary of the Beatton River, and was first described in the Texaco N.F.A. Buick Creek No. 7 well (located north-west of Fort St. John, east of the Alaska Highway) by J.H. Armitage in 1962. .
The Doig Formation is composed of fine grained, grey argillaceous siltstone and dark calcareous shale. Nodular phosphates occur at the base of the formation. Anomalously thicker, Porous sandstone channels and bars are present locally in the upper units of the formation.
The Doig formation is an important source rock for the Triassic Halfway and Charlie Lake formations. Total organic carbon values in the "phosphate zone" at the base of the Doig are commonly greater than 4% by weight and can reach up to 11%. The "phosphate zone" is also a potential undeveloped shale gas reservoir with as much as 400 trillion cubic feet of natural gas in place. Oil and gas is also extracted from the Doig Formation in conventional reservoirs along the western Montney trend and in the Peace River Arch.
The Doig Formation reaches a maximum thickness of 190 metres (620 ft) in the Canadian Rockies foothills it thins towards the north and east. It occurs in the sub-surface in north-western Alberta, north-eastern British Columbia and southern Yukon, from 53ºN and 118ºW to the Canadian Rockies.
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