Distribution and continuity of carbonate reservoirs
Conference
·
OSTI ID:7109093
Industry's production experience in Canada includes carbonates ranging in age from Ordovician to Triassic. They encompass the whole domain of carbonate reservoir types, from the small pinnacle reefs of Silurian and Middle Devonian age in Ontario and the Rainbow basin of northern Alberta, through the large Leduc and Slave Point reef complexes of central Alberta, to widespread shoals and carbonate banks of Devonian, Mississippian and Triassic age extending over much of the Western Canada basin. Carbonate reservoirs are characterized by extreme heterogeneity of porosity and permeability, often within a single pool. They range from massive, vuggy and fractured reservoir types in the organic-reef facies, to highly stratified, often vertically discontinuous reservoirs in the back-reef and shoal facies. Depletion plans for these pools, most of which are on enhanced recovery operation, require detailed, integrated geological-engineering studies. Initially, reservoir description, consisting of lithofacies, correlation cross-sections and fluid saturation studies, is used to develop reservoir engineering numerical models. Continued monitoring of operating performance is essential to ensure that the geological model is valid. Four representative pools will be reviewed to illustrate how the internal reservoir geometry has affected performance. In addition, the Judy Creek Beaverhill Lake ''A'' reservoir will be discussed to illustrate how detailed geological-engineering studies can change the operating practice within a pool. This field was changed from a peripheral flood to a pattern flood, resulting in substantial increase in expected oil recovery.
- OSTI ID:
- 7109093
- Report Number(s):
- CONF-761008-131
- Country of Publication:
- United States
- Language:
- English
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