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Discovery of the Redwater oil field in September, 1948, marked the second major Devonian reef field found in Alberta. The discovery well was located on the basis of detailed seismic work and came into production 19 months after discovery of the Leduc field. During May, 1950, 447 wells produced a market prorated average of 20,475 barrels per day of 34°-35° A.P.I. oil. Proved productive area is approximately 30,000 acres with calculated recoverable reserves in the order of 560 million barrels.
Cretaceous and Upper Devonian sediments only have so far been penetrated. Production is from a limestone reef (bioherm) occupying the same stratigraphic position as the dolomitized Leduc (D3) member of the Leduc oil field. At Redwater this zone lies at an average depth of 3,100 feet. The productive area trends northwest-southeast. It is limited on the east by the disappearance of the reef and on the west by edge-water. The north and south limits are not yet defined. The reef in its present structural attitude has a southwest dip of approximately 50 feet to the mile conforming to regional structure. Accumulation of the oil is probably both structural and stratigraphic. Various reef facies are present. These as well as the stratigraphy and structure are illustrated by slides and photogr phs.
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