| Mannville Group | |
|---|---|
| Stratigraphic range: EarlyCretaceous | |
| Type | Geological group |
| Sub-units | Glauconitic Sandstone,Ostracod Beds,Ellerslie Member,Grand Rapids Formation,Clearwater Formation,McMurray Formation,Waseca Sand,Sparky Sand,General Petroleum Sand,Rex Sand,Lloydminster Sand,Cummings Member,Dina Member,Pense Formation,Cantuar Formation,Success Formation |
| Underlies | Colorado Group |
| Overlies | Rundle Group,Banff Formation,Wabamun Formation |
| Thickness | up to 145 metres (480 ft)[1] |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | 53°18′31″N111°09′15″W / 53.3087°N 111.1541°W /53.3087; -111.1541 (Northwest Mannville 1 well) |
| Region | Alberta,Saskatchewan |
| Country | Canada |
| Type section | |
| Named for | Mannville, Alberta |
| Named by | Nauss, 1945 |
TheMannville Group is astratigraphical unit ofCretaceousage in theWestern Canadian Sedimentary Basin.
It takes the name from the town ofMannville, Alberta, and was first described in theNorthwest Mannville 1 well by A.W. Nauss in 1945.[2]
The Mannville Group consists of interbedded continentalsand andshale 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-easternAlberta.
Bitumen is produced from the McMurray Formation at theAthabasca Oil Sands.Heavy Oil is produced from theWabiskaw Member of theClearwater Formation in theWabasca oil field, and from multiple formations in theLloydminster andProvost areas in easternAlberta and westernSaskatchewan. Natural gas is extracted from the Ostracod and Glauconite beds insouthern Alberta, and light oil is extracted from the Ellerslie Member incentral and southern Alberta. Multiple oil fields[3] and gas fields[4] tap into the Manville Group.
Total gas reserves amount to316799×106 m3 in the Lower Mannville and644774×106 m3 in the Upper Mannville.[5] Recoverable oil reserves amount to105.64×106 m3 in the Lower Mannville and199.20×106 m3 in the Upper Mannville.[6]
The Mannville Group reaches a thickness of 145 feet (40 m) in its type locality. It occurs in the sub-surface incentral Alberta, extending east-west fromEdmonton toLloydminster and north-south from the Deep Basin to theUnited States border. It is present in the sub-surface in west-central and southernSaskatchewan.
The Mannville Group isdiscomformably overlain by theJoli Fou Formation shale of theColorado Group. It rests unconformably on the olderPaleozoic carbonates.
It is correlated with the lowerBlairmore Group in theCanadian Rockies foothills and to theBullhead Group and theSpirit River Formation of theFort St. John Group in north-western Alberta. It is also equivalent to theCantuar Formation inSaskatchewan and theSwan River Formation inManitoba.
The Mannville Group includes the following sub-units:
| Subdivision | Sub-unit | Age | Lithology | Max Thickness | Reference |
|---|---|---|---|---|---|
| Upper | Upper Mannville | marineshale andsandstone | |||
| Glauconitic Sandstone | Early Cretaceous | very fine to medium grainedquartzsandstone withsiderite andglauconite | 35 m (110 ft) | [7] | |
| Lower Mannville | |||||
| Ostracod Beds | Early Cretaceous | Unit A:shale andfossiliferous limestone Unit B: argillaceous limestone withostracod fossils Unit C: dark shale withsiltstone and sandstone interbed Unit D: fine to medium grained lithic calcareous sandstone withkaolinite andchert | 40 m (130 ft) | [8] | |
| Ellerslie Member | Early Cretaceous | Upper: fine grainedsand with sandy shale and shaley sand lenses Lower: medium grained quartz sand, siltstone,coal | 40 m (130 ft) 30 m (100 ft) | [9] | |
| Detrital Beds | Early Cretaceous | Chert pebbles, lithic sandstone, shale, siltstone | 70 m (230 ft) | [10] | |
| Sub-unit | Age | Lithology | Max Thickness | Reference |
|---|---|---|---|---|
| Grand Rapids Formation | Albian | bitumenous fine to medium sand (A, B and C sands, separated bysilt andshale) | 125 m (410 ft) | [11] |
| Clearwater Formation | Albian | black and green shales and sand | 85 m (280 ft) | [12] |
| Wabiskaw Member | Albian | glauconitic sands with black fissile shale | 35 m (110 ft) | [13] |
| McMurray Formation | lateBarremian to Aptian | fine grained bituminous sands | 60 m (200 ft) | [14] |
| Sub-unit | Age | Lithology | Max Thickness | Reference |
|---|---|---|---|---|
| Colony Sand | Early Cretaceous | friableglauconitic and argillaceoussandstone | 15 m (50 ft) | [15] |
| McLaren Member | Early Cretaceous | very fine grained sandstone and shale | 18 m (60 ft) | [16] |
| Waseca Sand | Early Cretaceous | sand with silt and shale | 25 m (80 ft) | [17] |
| Sparky Sand | Early Cretaceous | sand and shale | 12 m (40 ft) | [18] |
| General Petroleum Sand | Early Cretaceous | very fine to fine grained quartzose sand | 15 m (50 ft) | [19] |
| Rex Sand | Early Cretaceous | very fine to fine grained quartzose sand with silt and shale | 14 m (50 ft) | [20] |
| Lloydminster Sand | Early Cretaceous | unconsolidated quartz sand with silt | 30 m (100 ft) | [21] |
| Cummings Member | Early Cretaceous | shale with beds of sandstone | 27 m (90 ft) | [22] |
| Dina Member | Early Cretaceous | quartz sandstone with siltstone and shale | 60 m (200 ft) | [23] |
| Sub-unit | Age | Lithology | Max Thickness | Reference |
|---|---|---|---|---|
| Pense Formation | Albian | fine grained sandstone, clay, shaly silt | 36 m (120 ft) | [24] |
| Cantuar Formation | Aptian to Albian | mudstone and sandstone | 120 m (390 ft) | [25] |
| Success Formation | Jurassic toLower Cretaceous | quartzose sandstone and siltstone | 75 m (250 ft) | [26] |
