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  5. Table 12.3b

Chapter 12 Table Gas Production from the Woodbend Group

View Table 12.3b as an image.

Gas production from the Woodbend Group is primarily derived from D-3 reefs in south-central Alberta and especially occurs as solution gas in D-3 oil pools. There are 35 Woodbend gas fields with Initial Established Marketable Gas Reserves of over 1000 x 106m3 (35 BCF). The ten largest Woodbend gas fields, listed in order of Initial Established Marketable gas reserves, are shown in Table 1. Cumulative production data are updated for Alberta to the end of 1990.

Table 1. Ten Largest Woodbend Gas fields (in units of 106m3).

Initial Established
No. Field Formation No. of Pools Marketable Reserves In-place Volume Cumulative Production Discovery Year
1 Westerose South Leduc 1 39,200 52,407 38,938 1953
2 Strachan Leduc 3 29,369 44,364 25,891 1967
3 Ricinus West Leduc 1 24,500 49,756 21,545 1969
4 Homeglen-Rimbey Leduc sol'n 2 24,499 33,296 24,158 1952
5 Bonnie Glen Leduc sol'n 2 18,858 31,964 6,558 1951
6 Leduc-Woodbend Leduc sol'n 6 11,778 18,111 5,329 1947
7 Liege Grosmont 11 9,179 16,746 4,936 1974
8 Windfall Leduc sol'n 7 9,067 29,136 6,635 1955
9 Wimborne Leduc sol'n 1 8,006 14,443 5,349 1954
10 Westerose Leduc sol'n 1 6,166 8,815 3,123 1952

The largest field, Westerose South, occurs along the Rimbey-Meadowbrook Reef Trend, and the Strachan and Ricinus West fields are located in the deeper foothills of south-central Alberta. Six of the remaining seven largest Woodbend gas fields occur as solution gas associated with major Woodbend oil fields in south-central Alberta. The Liege gas field is the largest of a string of Grosmont gas fields along the Woodbend wedge edge in northeastern Alberta.

Total recoverable gas reserves in the Woodbend Group are estimated at 265.3 x 109m3, of which 188.9 x 109m3 (i.e. 71%) have already been produced. Initial Established In-Place Volume of Woodbend gas reserves totals 522.9 x 109m3. There are a total of 243 Woodbend gas pools, with an average 1092 x 106m3 recoverable gas reserves/pool. Table 2 lists the distribution of Woodbend gas reserves according to In-Place Pool Size.

Table 2. Size Distribution of Woodbend Gas Pools (in units of 106m3).

In-Place Pool Size Class No. of Pools Recoverable Reserves Cumulative Production
1.0 to 10 20 60 22
10 to 100 78 1,896 586
100 to 1000 92 18,913 7,389
1000 to 10000 41 69,822 37,914
over 10000 12 174,616 142,976
Total 243 265,307 x 106m3 188,887 x 106m3