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RAINBOW ZAMA
Pn
v)
p:
e”t;
WIIl
ILL
SLAVE POINT
NO
HORIZONTAL
SCALE CORRELATlON SECTION
RAINBW-ZAMA AREA
Fig. 12-6. Stratigraphic section through Rainbow-Zama area, Alberta. (Reproduced from
Barss et at., 1970, p. 42, fig. 20, with permission.)
nearly full to spill point, and reefs with oil/water contacts above spill point
(Fig. 12-7). The reservoirs have a wide range of properties. The source of the
oil and gas is probably in contemporaneous strata in euxinic, deeper water
facies outside the reef area, with various migration paths.
Some 400 km to the south, and south of the Peace River arch, are the reefs
of the Swan Hills area (Fig. 12-8), which have been described by Murray
(1966) and Hemphill et al. (1970). These reefs, of latest Middle Devonian to
early Late Devonian age (rather younger than those to the north) also grew
op a carbonate shelf in normal marine waters, and stromatoporoids were the
main frame builders. Some fringed carbonate banks. They grew in a transgres-
sive sea to reach vertical thicknesses up to rather more than 100 m, and their
