The partly dolomitized Swan Hills Simonette oil field (Givetian-Frasnian) of west-central Alberta reached maximum burial (6500 m, Tpeak $=$ 160$\sp\circ$C) during the Paleocene. Five buildup stages are recognized. The most consistently porous facies comprise grainy, proximal reef lithofacies. Early calcite spars occluded pores which influenced fluid flow during burial diagenesis. Dolomites have the highest porosities (up to 20%) due to leaching of calcite fossils. Permeability is greatest (up to 1000 mD) in porous dolomitized matrices. Fractures are typically plugged with pyrobitumen. Dolomite distribution is controlled by the more porous primary lithofacies and by proximity to faults. Most limestones are cemented tight although some contain up to 10% irreducible pores. Late-stage fluids that precipitated dolomites, calcites and sulphides ($\sp{87}$Sr/$\sp{86}$Sr $=$ 0.7370) probably were derived from the crystalline basement. These data can be explained by vertical flow of Laramide hydrothermal fluids along faults and lateral flow along the more porous and permeable facies.