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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 52 (2004), No. 2. (June), Pages 105-120

Geochemistry of medium gravity crude oils in southern Alberta and northern Montana

B. K. Manzano-Kareah, P. M. Stevenson, C. L. Riediger

ABSTRACT

Petroleum geochemistry data from thirty-one oil samples from southern Alberta and northern Montana are used to distinguish oil families in this region. The highest quality oils (API gravity generally >35°, sulphur content <1.5 wt %) are grouped together as Family M. The second oil family displays lower oil gravity and higher sulphur values, and is correlated with Family E (as initially described by Karavas et al., 1998). Biodegradation of oils in the study area is relatively minor, and is restricted to only a few pools. The source rock for the Family E oils appears to be the Devonian-Mississippian Exshaw Formation, whereas calcareous shales of the Mississippian Banff/Madison Group are postulated as the source for the Family M oils.

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