Mannville Group

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Template:Short description Template:Infobox Rockunit The Mannville Group is a stratigraphic unit of Cretaceous age in the Western Canadian Sedimentary Basin.

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

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 Alberta.

Hydrocarbon production

Bitumen is produced from the McMurray Formation at the Athabasca Oil Sands. Heavy Oil is produced from the Wabiskaw Member of the Clearwater Formation in the Wabasca oil field, and from multiple formations in the Lloydminster and Provost areas in eastern Alberta and western Saskatchewan. Natural gas is extracted from the Ostracod and Glauconite beds in southern Alberta, and light oil is extracted from the Ellerslie Member in central and southern Alberta. Multiple oil fields[2] and gas fields[3] tap into the Manville Group.

Total gas reserves amount to Script error: No such module "val". in the Lower Mannville and Script error: No such module "val". in the Upper Mannville.[4] Recoverable oil reserves amount to Script error: No such module "val". in the Lower Mannville and Script error: No such module "val". in the Upper Mannville.[5]

Distribution

The Mannville Group reaches a thickness of Script error: No such module "convert". in its type locality. It occurs in the sub-surface in central Alberta, extending east-west from Edmonton to Lloydminster and north-south from the Deep Basin to the United States border. It is present in the sub-surface in west-central and southern Saskatchewan.

Relationship to other units

The Mannville Group is discomformably overlain by the Joli Fou Formation 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 Group and the Spirit River Formation of the Fort St. John Group in north-western Alberta. It is also equivalent to the Cantuar Formation in Saskatchewan and the Swan River Formation in Manitoba.

Subunits

The Mannville Group includes the following sub-units:

Central 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 Script error: No such module "convert". [6]
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		 Script error: No such module "convert". [7]
Ellerslie Member Early Cretaceous Upper: fine grained sand with sandy shale and shaley sand lenses
Lower: medium grained quartz sand, siltstone, coal		 Script error: No such module "convert".
Script error: No such module "convert". 		[8]
Detrital Beds Early Cretaceous Chert pebbles, lithic sandstone, shale, siltstone Script error: No such module "convert". [9]
  • In southern Alberta, the Ellerslie Member is replaced by the Sunburst Member, Taber Sandstone, and Cutbank Sandstone.

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) Script error: No such module "convert". [10]
Clearwater Formation Albian black and green shales and sand Script error: No such module "convert". [11]
Wabiskaw Member Albian glauconitic sands with black fissile shale Script error: No such module "convert". [12]
McMurray Formation late Barremian to Aptian fine grained bituminous sands Script error: No such module "convert". [13]

Lloydminster region

Sub-unit Age Lithology Max
Thickness		 Reference
Colony Sand Early Cretaceous friable glauconitic and argillaceous sandstone Script error: No such module "convert". [14]
McLaren Member Early Cretaceous very fine grained sandstone and shale Script error: No such module "convert". [15]
Waseca Sand Early Cretaceous sand with silt and shale Script error: No such module "convert". [16]
Sparky Sand Early Cretaceous sand and shale Script error: No such module "convert". [17]
General Petroleum Sand Early Cretaceous very fine to fine grained quartzose sand Script error: No such module "convert". [18]
Rex Sand Early Cretaceous very fine to fine grained quartzose sand with silt and shale Script error: No such module "convert". [19]
Lloydminster Sand Early Cretaceous unconsolidated quartz sand with silt Script error: No such module "convert". [20]
Cummings Member Early Cretaceous shale with beds of sandstone Script error: No such module "convert". [21]
Dina Member Early Cretaceous quartz sandstone with siltstone and shale Script error: No such module "convert". [22]

Southern Saskatchewan

Sub-unit Age Lithology Max
Thickness		 Reference
Pense Formation Albian fine grained sandstone, clay, shaly silt Script error: No such module "convert". [23]
Cantuar Formation Aptian to Albian mudstone and sandstone Script error: No such module "convert". [24]
Success Formation Jurassic to Lower Cretaceous quartzose sandstone and siltstone Script error: No such module "convert". [25]

References

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  1. ↑ Nauss, Arthur William, 1945. Cretaceous stratigraphy of Vermilion area, Alberta, Canada; American Association of Petroleum Geologists (AAPG), AAPG Bulletin, vol. 29, no. 11 (November), pp. 1605-1629.
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