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The Mannville Group is a stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.

It takes the name from the town of Mannville, Albertamarker, and was first described in the Northwest Mannville 1 well by A.W. Nauss in 1945.

Lithology

The Mannville Group consists of interbedded continental sand and shale in the base, followed by a calcareous sandstone member, marine shale, glauconitic sandstone and salt and pepper sandstone. An additional non-marine sequence is present in north-eastern Albertamarker.

Hydrocarbon production

Bitumen is produced from the McMurray Formation at the Athabasca Oil Sandsmarker. Heavy Oil is produced from the Wabiskaw Member of the Clearwater Formationmarker in the Wabasca Oil Fieldmarker, and from multiple formations in the Lloydminstermarker and Provostmarker areas in eastern Albertamarker and western Saskatchewanmarker. Natural gas is extracted from the Ostracode and Glauconite beds in southern Alberta, and light oil is extracted from the Ellerslie Member in central and southern Alberta. Multiple oil fields and gas fields tap into the Manville Group.

Total gas reserves amount to 316,799 x 106m³ in the Lower Mannville and 644,774 x 106m³ in the Upper Mannville. Recoverable oil reserves amount to 105.64 x 106m³ in the Lower Mannville and 199.20 x 106m³ in the Upper Mannville.

Distribution

The Mannville Group reaches a thickness of in its type locallity. It occurs in the sub-surface in central Alberta, extending east-west from Edmontonmarker to Lloydminsterandmarker north-south from the Deep Basin to the United Statesmarker border.

Relationship to other units

The Mannville Group is discomformably overlain by the Joli Fou Formationmarker shale of the Colorado Group. It rests unconformably on the older Paleozoic carbonates.

It is correlated with the lower Blairmore Group in the Canadian Rockies foothills and to the Bullhead Groupmarker and the Spirit River Formationmarker of the Fort St. John Group on north-western Alberta. It is also equivalent to the Cantuar Formation in Saskatchewanmarker and the Swan River Formation in Manitobamarker.

Subunits

The Mannville Group includes the following sub-units:
Central Alberta and southern Alberta
Subdivision Sub-unit Age Lithology Max
Thickness
Reference
Upper Upper Mannville marine shale and sandstone
Glauconitic Sandstone Early Cretaceous very fine to medium grained quartz sandstone with siderite and glauconite
Lower Mannville
Ostracod Beds Early Cretaceous Unit A: shale and fossiliferous limestone
Unit B: argillaceous limestone with ostracod fossils
Unit C: dark shale with siltstone and sandstone interbed
Unit D: fine to medium grained lithic calcareous sandstone with kaolinite and chert


Ellerslie Membermarker Early Cretaceous Upper: fine grained sand with sandy shale and shaley sand lenses
Lower: medium grained quartz sand, siltstone, coal


Detrital Beds Early Cretaceous Chert pebbles, lithic sandstone, shale, siltstone
Athabasca region
Sub-unit Age Lithology Max
Thickness
Reference
Grand Rapids Formation Albian bitumenous fine to medium sand (A, B and C sands, separated by silt and shale)
Clearwater Formationmarker Albian black and green shales and sand
Wabiskaw Member Albian glauconitic sands with black fissile shale
McMurray Formationmarker late Barremian to Aptian fine grained bitumenous sands
Lloydminstermarker region and west-central Saskatchewanmarker
Sub-unit Age Lithology Max
Thickness
Reference
Waseca Sand Early Cretaceous sand with silt and shale
Sparky Sand Early Cretaceous sand and shale
General Petroleum Sand Early Cretaceous very fine to fine grained quartzose sand
Rex Sand Early Cretaceous very fine to fine grained quartzose sand with silt and shale
Lloydminster Sand Early Cretaceous unconsolidated quartz sand with silt
Cummings Member Cretaceous shale with beds of salt-and-pepper sandstone
Dina Member Early Cretaceous quartz sandstone with siltstone and shale


References


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