Northwest
Territories
PLAY: SECOND WHITE SPECKS WILLESDEN GREEN-EDSON RESOURCE OIL
T125
E
Play Description: Covering much of southern Alberta and Saskatchewan, the Second White Specks (2WS) section comprises
organic-rich shales and sandy/silty shales, which mark an important anoxic event that resulted in a prolific source rock. In the
deeper parts of the basin, to the southwest, the rock sources oil, and to the northeast biogenic gas is produced. A 2WS
conventional oil trend runs NW-SE parallel to the Mesozoic deformation front in Alberta’s Deep Basin, from Fir (Edson) roughly
to the north end of Garrington (Willesden Green). This broad region also encompasses most of the oil resource play wells,
which produce from fractured shales and siltstones.
Mesozoic Defor
Alberta
T100
mation Fron
t
T75
NW
British
Columbia
Phanerozoic Erosional Edge
FIR
PINE CREEK
EDSON
SE
T50
PEMBINA
Saskatchewan
WILLESDEN
GREEN
R1W6
GARRINGTON
Manitoba
Resource Play
T25
Second White Specks Willesden Green-Edson Resource Oil
Structural and Geological Elements
Second White Specks Depositional/Erosional Edge*
Leduc Platform and Reefs*
Deep Basin Approximate Limit
R1E1
R1W1
Oil Sands Deposits
Fields Mentioned in Text
* (WCSB Atlas, 1994)
Idaho
R1W5
Montana
T1
R1W4
R1W3
R1W2
North Dakota