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ABSTRACT

Navarin Basin, located on the northwestern margin of the Bering Sea Shelf, is a Cenozoic backarc extensional basin overlying Mesozoic rocks. Formation of the basin began with right-lateral oblique extension along northwest trending strike/ slip fault systems. Local highs provided sediment supply to syntectonic lows. Seismic facies analysis of this syntectonic fill suggested alluvial to shallow marine fill, possibly in an estuarine setting. Subsequent inversion of this syntectonic package resulted in its being in a structurally high position.

Analysis of the exploration potential of this syntectonic package suggested that it could be sand prone, and might provide an effective reservoir if seal rock was deposited prior to the major pulse of hydrocarbon generation from known Eocene oil-prone organic rich rock.

Drilling of the syntectonic package, following O.C.S. Sale 83 (April 1984) found tight, late Cretaceous non-marine to shallow marine facies with no hydrocarbons. Post-drill analysis confirmed that the tectonic inversion history did not provide effective topseal of the potential reservoir sandstones prior to the main pulse of hydrocarbon generation.

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