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The hydrocarbon reservoir at Endicott Field, located offshore from the Sagavanirktok Delta in northeast Alaska, is the Kekiktuk Formation which is late Mississippian in age. It rests directly on weathered basement of weakly metamorphosed argillite. The lowermost Kekiktuk, known as Zone 1 in Endicott Field, is not recognized at the type section in the northeastern Brooks Range. It consists of coarsely interbedded mudstones, siltstones, coals and very fine to finegrained sandstones. Facies relationships suggest that deposition took place upon an undulating peneplaned basement surface in a number of environments. Those included: well and poorly drained swamps; deeper, swampplain lakes; partially and wholly abandoned fluvial channels, and a number of overbank environments including levees and possibly crevasse splays/lacustrine deltas. The overall setting was a lowlying swamp plain with numerous lakes, traversed by sluggish, mixed to suspendedload streams. In the Endicott Field area, the streams appear to have been more dominant in middle Zone 1 time; however, the distinction between streams and overbank environments was not marked, and the area was characterized by common overbank flooding and channel abandonment. By endZone 1 time, the entire area appears to have been blanketed by swamps and swampplain lakes.

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