The Ivishak Formation, the main reservoir in the Prudhoe Bay field, averages 600 ft (180 m within the field and consists of a lower progradational sequence (400 ft or 120 m) and an upper retrogradational sequence (200 ft or 60 m). Depositional environments interpreted from core examination and log correlation include delta-front, delta-plain, and coarsegrained coastal-plain facies within the lower sequence and a fine-grained coastal-plain facies in the upper sequence.

Coarsening-upward deposits of the delta-front facies overlie and interfinger with the marine to prodelta Kavik shale. Fluvially dominated deposition within a sand-rich delta resulted inoverlapping and coalescing channel-mouth bars occasionally...

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