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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The eight major discovery in Cook Inlet basin was announced on October 24, 1965, as a result of drilling the Union-operated Grayling 1-A well near the crest of a broad, low-relief anticline that had been mapped from seismic data as early as 1959. The prolific Hemlock Conglomerate was tested at rates exceeding 2,000 BOPD. As delineation wells confirmed the size of the accumulation, three separate platforms were ordered and were in place by July 1967, and within three months, production from the Hemlock had begun.
Additional oil-productive sands in the Tyonek Formation, immediately overlying the Hemlock as well as several more in the underlying West
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Foreland Formation, were placed on production in September 1969. Significant gas reserves in shallower Tyonek Formation sandstone have only been used so far for platform power and gas lift. Development plans are currently being formulated for these reservoirs in response to the recent increasing demands for gas in Cook Inlet.
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