Geophysical Studies of the Steen River Impact Structure, Alberta, Canada

C-30 GEOPHYSICAL STUDIES OF THE STEEN RIVER IMPACT STRUCTURE ALBERTA CANADA Introduction Located in northern Alberta (59 o 30’N 117 o 38’W) the buried ~25 km diameter Steen River structure is the largest known impact crater remnant in the Western Canadian Sedimentary Basin (WCSB) (Winzer 1972). The structure has been a seasonal oil producer since June 1968 and a gas producer since March 1999 (Robertson 1997; Hladiuk et al. 1999). Current hydrocarbon production is ~685 BOPD and 12 Mmcf/d gas mostly from the Keg River and Slave Point Formations over a fraction of the crater rim. The feature is buried