Seismic Signature Of The Morinville Leduc Formation Reef


The Morinville and St. Albert-Big Lake fields are located in south-central Alberta, Canada, along the north-northeast trending Rimbey-Meadowbrook series of Leduc Fm reefs which separate the east and west Ireton shale basins (Figures 1 and 2). The Morinville field is subdivided into 36 assigned and unassigned pools, five of which (Table 1) are wholly or partially within the Morinville/St. Albert-Big Lake study area (Figure 3). The St. Albert-Big Lake field is similarly comprised of 8 pools, only three of which (Table 1) are wholly or partially in the study area. Only one of the 5 Morinville pools, D-3B, is a Leduc Fm reservoir; the other four, Lower Manvllle H, Lower Mannville K, Upper Mannville D and Viking B, produce from the Cretaceous. Similarly, only one of the three St. Albert-Big Lake pools, D-3B, is a Leduc Fm reservoir; the other two, D-1B and Ostracod A, produce from the Wabamun and Ostracod formations, respectively. In Table 1, cumulative production data are presented for the Morinville/St. Albert-Big Lake study area. The Leduc Fm, the principal reservoir formation, is differentiated in the study area into full reef and basal reef. The full reef, typified by the St. Albert reef (Figure 3), towers some 250 m above the Cooking Lake Fm platform. In contrast, the basal reef, typified by the Morinville reef, stands about 100 m above the platform. Both buildups are productive. With respect to Leduc Fm reefs, the Morinville/St. Albert-Big Lake study area is extremely interesting for two reasons: 1) Together the Morinville reef (D-3B pool) and St. Albert reef (D-3B pool) illustrate that some closely spaced Leduc Fm buildups attained startlingly dissimilar heights, implying that cessation of reef growth occurred at different times. 2) The Morinville reef is an excellent example of a basal-reef reservoir.


Geosciences and Geological and Petroleum Engineering

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Article - Conference proceedings

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Publication Date

01 Jan 1998