The Geological Atlas of the Western Canada Sedimentary Basin

Chapter 12

Devonian Woodbend-Winterburn Strata

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Figure 12.1

Table of formations and selected members of the Woodbend-Winterburn strata of Western Canada.

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Figure 12.2

Isopach map of the combined Woodbend-Winterburn intervals.

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Figure 12.3

Isopach map of the Woodbend intervals.

Table 12.3a

Oil production from the Woodbend Group.

Table 12.3b

Gas production from the Woodbend Group.

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Figure 12.4

Isopach map of the Winterburn intervals.

Table 12.4a

Oil production from the Winterburn Group.

Table 12.4b

Gas production from the Woodbend Group.

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Figure 12.5

Structure map on top of Winterburn (Frasnian) strata.

Figure 12.6

Major arches and lineaments influencing deposition of Woodbend-Winterburn strata.

Figure 12.7

Schematic cross section showing the subdivision of Woodbend-Winterburn strata and their relation to key type sections. Bold correlation lines represent the bounding events used for interval map construction. Note that the Majeau Lake is divided into an upper and lower unit. Only the lower unit is equivalent to the Cooking Lake basin fill. However, for simplicity, the Cooking Lake carbonate is mapped separately from the combined Upper and Lower Majeau Lake shale.

Figure 12.8

Stratigraphic cross section showing correlation of the Redwater reef stages, defined by core data, to their equivalent basin-wide sequence boundary (shown by bold lines). Smaller orders of cyclicity are also evident (thin correlation lines), which can also be correlated over large areas of the basin. (Reef correlation and facies modified from Wendte and Callow, Fig. 4, page 191, in Stoakes, 1992b).

Figure 12.9

Schematic diagram illustrating the major transgressive-regressive cycles of the Woodbend-Winterburn interval. A stacked pattern of large carbonate platforms (initial transgression), followed by source rock and/or isolated reef complex development (maximum transgression), and finally by cycles of basin-filling shales and carbonates (regression) is observed throughout the Woodbend-Winterburn Interval.

Figure 12.10

Schematic cross section showing stages of reef, shelf and basin-fill development within Woodbend intervals. See Figure 12.7 caption for explanation of the Majeau Lake-Cooking Lake relationship.

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Figure 12.11

Index map showing the major Woodbend reef complexes, basins, oil and gas pools and lines of cross section. Palinspastically restored areas are modified from Andrews (1987).

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Figure 12.12

Isopach and lithofacies map of the Cooking Lake interval. Lower left inset cross section highlights the mapped interval. The isopach embraces only the Cooking Lake carbonate. Equivalent Lower Majeau Lake basin fill is combined with the Upper Majeau Lake in Figure 12.16.

Figure 12.13

South-north cross section H-H', showing Woodbend basin-fill strata immediately west of the Cooking Lake shelf margin from Strachan to the Grosmont area. Log traces are gamma ray. Line of section is shown on Figure 12.11.

Figure 12.14

West-east cross section J-J', showing Woodbend-Winterburn strata from Gold Creek to the Grosmont area. Log traces are gamma ray. Line of section is shown on Figure 12.11.

Figure 12.15

West-east cross section M-M', showing Woodbend-Winterburn strata from southern Alberta to Saskatchewan. Note that the Southern Leduc Shelf is divided into three major stages. Log traces are gamma ray. Line of section is shown on Figure 12.11.

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Figure 12.16

Isopach and lithofacies map of the Majeau Lake interval. Lower left inset cross section highlights the interval depicted in the map. Only the solid colour interval in this cross section is isopached. The equivalent (hachured) lower Leduc stage is not isopached.

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Figure 12.17

Isopach and lithofacies map of the Duvernay interval. The solid colour interval in the lower left inset cross section is isopached. The equivalent Middle Leduc stage (hachured) is not isopached.

Figure 12.18

South-north cross section K-K', showing Woodbend-Winterburn strata from Duhamel to Grosmont area. Log traces are gamma ray, except for 11-11-50-17W4, which is a spontaneous potential trace. Line of section is shown on Figure 12.11.

Figure 12.19

Northwest-southeast cross section L-L', showing Woodbend-Winterburn strata from the Peace River Arch to Rimbey. Line of section is shown on Figure 12.11.

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Figure 12.20

Isopach and lithofacies map of the Lower Ireton interval. Only the Lower Ireton and Westerdale basin fill south of the Peace River-Athabasca Arch is isopached. Lower Ireton equivalent basin fill north of the Arch is combined with the Upper Ireton isopach in Figure 12.29. The equivalent Upper Leduc stage, shown by hachured area in the inset lower left cross section, is not isopached.

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Figure 12.21

Maximum attained/preserved thickness of the Leduc Formation in Alberta. Although it is not illustrated, the combined thickness of the Grosmont stages and Lower Leduc Calling Lake reefs decreases northward. Maximum attained thickness in the northern extension of the combined Grosmont and Lower Leduc is 210 m. General thinning of the Leduc over the Peace River Arch, West Alberta Ridge, axis of the Athabasca Arch and southeast of the Meadow Lake Escarpment (southern shelf edge) suggests that paleotopographic control and reduced subsidence in these areas affected Leduc deposition. Palinspastically restored areas are modified from Andrews (1987).

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Figure 12.22

Summary of the evolution of the Woodbend reef/shelf and basin-fill deposits. a. Lower Leduc paleogeography. b. Middle Leduc paleogeography. c. Upper Leduc paleogeography. d. Evolution and pattern of Woodbend basin-fill deposition.

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Figure 12.23

Northwest-southeast cross section N-N', showing Woodbend-Winterburn strata from Grosmont to Killam barrier. Log traces are gamma ray. Line of section is shown on Figure 12.11.

Figure 12.24

Schematic southeast-northwest cross section P-P', showing Woodbend-Winterburn strata of the Rocky Mountain Front Ranges of Alberta. Line of section is shown on Figure 12.11.

Figure 12.25

a. Map of major Grosmont shelf edges. b. West-east cross section Q-Q', showing the Grosmont stages and highlighting the Lower Grosmont shale embayment. Log traces are gamma ray. See 12.25a for line of cross section. c. Series of schematic cross sections showing the evolution of Leduc reefs and Grosmont shelf development. Line of section is shown on 12.25a.

Figure 12.26

Correlation of reef stages from selected Leduc reef complexes of Alberta. Note that selected wells do not necessarily represent the maximum build-up from the reef complex. Log traces are gamma ray and sonic travel time.

Figure 12.27

West-east cross section R-R', showing Woodbend and Nisku equivalent basin-fill strata of northern Alberta.

Figure 12.28

Southwest-northeast cross section S-S', showing syndepositional faulting during Fort Simpson sedimentation. Note that the vertical scale (1:12 000 000) is markedly condensed from the Atlas cross section standard (1:3000).

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Figure 12.29

Isopach and lithofacies map of the Upper Ireton interval. North of the Peace River-Athabasca Arch, the isopachs embrace the combined Upper and Lower Ireton intervals.

Figure 12.30

West-east cross section B-B*, showing Woodbend-Winterburn strata of northeastern British Columbia, northern Alberta and southern Northwest Territories.

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Figure 12.31

Index map showing the major depositional elements of the Winterburn interval, and lines of cross section. White boxes show areas covered in Figure 12.32.

Figure 12.32

a. Producing Nisku pinnacle reefs in the Brazeau-West Pembina area, and a generalized depositional model for the Zeta Lake reef complexes. b. Winterburn hydrocarbon accumulations on the southern shelf. With the exception of Joffre and a portion of the Woodbend oil pool, all other depicted pools overlie Leduc reef complexes.

Figure 12.33

Schematic illustration of the key stratigraphic relationships of the Winterburn interval. Heavy correlation lines represent the key bounding events used to define the mapped Winterburn intervals. Note that for simplicity, the 'Z' marker event is picked at the base of the Nisku east of the Nisku shelf margin.

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Figure 12.34

Isopach and lithofacies map of the Nisku interval.

Figure 12.35

Northwest-southeast cross section T-T', illustrating Winterburn stratigraphy from the Meekwap shelf to the West Pembina area. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.

Figure 12.36

West-east cross section U-U', illustrating Winterburn stratigraphy from the northern Cynthia Basin to the Grosmont shelf. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.

Figure 12.37

Southwest-northeast cross section V-V', illustrating Winterburn stratigraphy from the northern Cynthia Basin to the Wild River Basin. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.

Figure 12.38

West-east cross section W-W', illustrating Winterburn stratigraphy across the Grosmont shelf edge. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.

Figure 12.39

Northwest-southeast cross section X-X', illustrating Winterburn stratigraphy across the Peace River Arch. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.

Figure 12.40

West-east cross section Y-Y', illustrating Winterburn stratigraphy across the Jean Marie shelf edge. Log traces are gamma ray. Line of section is shown in Figure 12.31. Vertical scale is 1:3000.