Leduc Formation
| Leduc Formation Stratigraphic range: Frasnian |
|
|---|---|
| Type | Geological formation |
| Unit of | Western Canadian Sedimentary Basin |
| Underlies | Duvernay Formation, Ireton Formation |
| Overlies | Beaverhill Lake Formation |
| Thickness | up to 300 m (980 ft) |
| Lithology | |
| Primary | Dolostone |
| Other | Limestone |
| Location | |
| Coordinates | 53°20′42″N 113°41′42″W / 53.3451°N 113.6949°WCoordinates: 53°20′42″N 113°41′42″W / 53.3451°N 113.6949°W |
| Region |
 Alberta
|
| Country |
 Canada
|
| Type section | |
| Named for | City of Leduc, Alberta |
| Named by | Imperial Oil Limited, 1950 |
The Leduc Formation is a stratigraphic unit of Late Devonian (Frasnian) age in the Western Canada Sedimentary Basin. It takes its name from the city of Leduc, and it was formally described from the B.A. Pyrz No. 1 well in central Alberta, between the depths of 1,623.7 m (5,327 ft) and 1,807.5 m (5,930 ft), by Imperial Oil Limited in 1950. Supplementary information came from a complete section of the formation that was cored in Imperial Oil's Leduc No. 530 well between 1,633 m (5,358 ft) and 1,863 m (6,112 ft).
The Leduc Formation is a major producer of oil and gas in central Alberta, and the drilling of the highly successful Leduc No. 1 well in 1947 ushered in a new era in the Western Canadian petroleum industry.
The Leduc Formation consists of fossil reefs that are highly porous, which makes them excellent reservoirs for oil and gas. They were deposited as limestone and mudstone in shallow water reef environments. Stromatoporoids were the primary reef-building organisms, and rock-types range from skeletal mudstones and floatstones to finer grained muddy packstones and wackestones. Many, but not all, of the reefs were later subjected to dolomitization during diagenesis, which increased their porosity, and they now consist of dolostone rather than limestone.
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