Petroleum geology and geochemistry of the Manyberries oil field, southeastern Alberta.

摘要

The Manyberries oil field is located in the southeastern corner of Alberta (township 4-5, range 4-5W4) and contains medium to light gravity crude oil (33{dollar}spcirc{dollar} to 45{dollar}spcirc{dollar} API) in quartzose, fluvial sands of the Mannville Formation. The hydrocarbon trapping mechanism for the area is stratigraphic due to the unconformable nature of the overlying contact with the overlying Upper Mannville Formation.; Organic geochemical analysis determined that the oils from the Manyberries field have similar characteristics and are designated here as Family M oils. A comparison of Family M organic geochemical characteristics to other Upper Jurassic to Lower Cretaceous oil fields from southeastern Alberta and north-central Montana indicates that oils from Black Butte (southeastern Alberta), Whitlash, and Fred and George Creek oil fields (Montana) are similar the Manyberries oil, and hence are also classified as Family M oils.; The hydrocarbon source for the Family M oils has not been identified, but organic geochemical characteristics suggest a carbonate source rock within the Upper Devonian Saskatchewan Group of the Williston Basin at peak oil generation, implying long distance oil migration ({dollar}>{dollar}400km) from central Williston Basin and into southeastern Alberta.