The eighth 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...
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