Winterburn Group

Winterburn Group Stratigraphic range: Frasnian PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Sub-units	Nisku Formation, Calmar Formation, Graminia Formation, Blue Ridge Member
Underlies	Wabamun Group
Overlies	Ireton Formation
Thickness	up to 150 metres (490 ft)^[1]
Lithology
Primary	Dolomite, limestone, siltstone
Other	Anhydrite, shale
Location
Coordinates	53°20′42″N 113°41′42″W / 53.3451°N 113.6949°W / 53.3451; -113.6949 (Winterburn Group)Coordinates: 53°20′42″N 113°41′42″W / 53.3451°N 113.6949°W / 53.3451; -113.6949 (Winterburn Group)
Region	Alberta
Country	Canada
Type section
Named for	Winterburn, Edmonton
Named by	Imperial Oil Limited, 1950

The Winterburn Group is a stratigraphical unit of Frasnian age in the Western Canadian Sedimentary Basin.

It takes the name from Winterburn area located west of Edmonton, and was first described in well P.A. Pyrcz No. 1 by Imperial Oil Limited in 1950.^[2]

Lithology

The Winterburn Group is composed of silty dolomite, evaporite, argillaceous limestone, red and green siltstone, anhydrite, silty dolomite and siltstone. Pinnacle reefs develop in the Nisku Formation. ^[1]

Hydrocarbon production

Oil is produced from the Nisku Formation in the Pembina oil field.

Distribution

The Winterburn Group reaches a maximum thickness of 150 metres (490 ft) west of the Leduc reef system. In central Alberta it is 30 to 70m thick. It thins out over the Peace River Arch, and disappears in north-eastern British Columbia.^[1]

Subdivisions

The Winterburn Group is composed, from bottom to top, of the Nisku, Calmar and Graminia Formations. The Graminia Formation includes the carbonate Blue Ridge Member west of the Rimbey-Meadowbrook reef trend.

Sub-unit	Age	Lithology	Max. Thickness	Reference
Graminia Formation	Frasnian	silty dolomite, anhydrite, siltstone Blue Ridge Member:^[3] silty dolomite, siltstone	18.3 m (60 ft)	^[4]
Calmar Formation	Frasnian	dolomitic shale and siltstone, anhydrite	13.4 m (40 ft)	^[5]
Nisku Formation	Frasnian	crystalline dolomite, dolomitic siltstone, green shale, anhydrite.	100 m (330 ft)	^[6]

Relationship to other units

The Winterburn Group is conformably overlain by the Wabamun Group and overlays the Ireton Formation, except in the Peace River Arch, where it rests on the Precambrian basement.^[1]

It is correlated with the Birdbear Formation and part of the Three Forks Group in Saskatchewan, with the Southesk Formation and Alexo Formation in the Canadian Rockies and with the Redknife Formation and Kakisa Formation in north-eastern British Columbia.

References

1 2 3 4 Lexicon of Canadian Geologic Units. "Winterburn Group". Retrieved 2009-03-01.
↑ Geological Staff, Imperial Oil Limited, Western Division, 1950. Devonian Nomenclature in Edmonton Area, Alberta, Canada. Bulletin of the American Association of Petroleum Geologists, Vol. 34, No. 9, pp. 1807-1825.
↑ Lexicon of Canadian Geologic Units. "Blue Ridge Formation". Retrieved 2011-04-02.
↑ Lexicon of Canadian Geologic Units. "Graminia Formation". Retrieved 2009-12-31.
↑ Lexicon of Canadian Geologic Units. "Calmar Formation". Retrieved 2009-12-31.
↑ Lexicon of Canadian Geologic Units. "Nisku Formation". Retrieved 2009-12-31.

Western Canadian Sedimentary Basin

Hydrocarbon history	Oil sands and heavy oil Frontier exploration and development Natural gas liquids Natural gas

Depositional Regions	Southern Alberta Central Alberta Northwestern Alberta Plains South-central Canadian Rockies foothills North-east Plains North-central foothills Liard River Fort Nelson Northern Rocky Mountains Fort St. John Saskatchewan Western Manitoba

Northwest Plains	Paskapoo FM Scollard FM Wapiti GRP Smoky GRP Puskwaskau FM Badheart FM Muskiki FM Cardium FM Kaskapau FM Pouce Coupe MBR Doe Creek MBR Dunvegan FM Fort St. John GRP Shaftesbury FM Peace River FM Spirit River FM Bullhead GRP Bluesky FM Gething FM Cadomin FM Nikanassin FM Fernie GRP Rock Creek MBR Poker Chip Shale Nordegg MBR Schooler Creek GRP Baldonnel FM Charlie Lake FM Halfway FM Doig FM Montney FM Belloy FM Stoddart GRP Taylor Flat FM Kiskatinaw FM Golata FM Rundle GRP Debolt FM Shunda FM Pekisko FM Banff FM Exshaw FM Wabamun FM Trout River FM Kakisa FM Redknife FM Jean Marie MBR Woodbend GRP Irteton FM Fort Simpson FM Leduc FM Duvernay FM Cooking Lake FM Beaverhill Lake GRP Waterways FM Swan Hills FM Fort Vermilion FM Elk Point GRP Watt Mountain FM Gillwood MBR Presqu’ile FM Sulphur Point FM Pine Point FM Muskeg FM Zama MBR Black Shale Keg River FM Rainbow MBR Chinchaga FM Cold Lake FM Ernestina FM Basal Red Beds Granite Wash Canadian Shield

Northeastern Plains	Bearpaw FM Belly River GRP Lea Park FM La Biche GRP Viking FM Joli Fou FM Colony SS Mannville GRP McLaren MBR Grand Rapids FM Waseca SS Sparky SS Gen. Petr. SS Clearwater FM Rex SS Lloydminster SS Wabiskaw MBR Cummings MBR McMurray FM Dina MBR Banff FM Exshaw FM Wabamun FM Winterburn FM Woodbend GRP Grosmont FM Irteton FM Cooking Lake FM Beaverhill Lake GRP Elk Point GRP Canadian Shield

Central Alberta	Paskapoo FM Scollard FM Edmonton GRP Battle FM Whitemud MBR Horseshoe Canyon FM Bearpaw FM Belly River GRP Ribstone Creek MBR Victoria MBR Brosseau MBR Lea Park FM Colorado GRP Cardium FM Mannville GRP Glauconitic Sandstone Ostracod Beds Sunburst Member Taber Member Detrital Beds Fernie GRP Rock Creek MBR Nordegg MBR Rundle GRP Mount Head FM Elkton MBR Shunda FM Pekisko FM Banff FM Exshaw FM Canadian Shield

This article is issued from Wikipedia - version of the Friday, January 23, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.