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 and , 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 and . The Leduc Formation is a major source 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. Lithology 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 dolomite rather than limestone. The dolomitization that took place in the region has increased the porosity primarily in the more deeply buried lagoonal back reef facies. The pre-existing porosity has also been preserved well due to the dolomitization. Porosity in the region is dominated by vuggy, moldic, intercrystalline, as well as fracture types of porosity. Generally, the mean porosity of the Leduc Formation is 5.2%, with the permeability of the rocks in the region being an even spread. Anhydrite is also common in the Leduc Formation, along with the replacement dolomitization. Oil and gas production The Leduc Formation is a major source of oil and natural gas in central Alberta. The Leduc No. 1 well drilled in 1947 produced 50 thousand cubic metres (more than 300 thousand barrels) of oil, marking the beginning of the post-war Albertan oil boom, and contributed to a large population boom in the cities of Calgary and Edmonton. The discovery and subsequent production from the wells also led to an economic boom in Alberta, which now puts Calgary among the forefront of producers of oil in North America. The Strachan and Ricinus West gas fields, discovered in 1967 and 1969, are also in Late Devonian Leduc-age reefs. The reefs were found using seismic