--> Abstract: Geology of Offshore Lower Cook Inlet, Alaska, from Seismic Data, by Michael A. Fisher; #90976 (1976).
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Abstract: Geology of Offshore Lower Cook Inlet, Alaska, from Seismic Data

Previous HitMichaelTop A. Fisher

In 1975 the U.S. Geological Survey acquired 500 km of 36-fold seismic data in the lower Cook Inlet from the Iniskin Peninsula on the north to Cape Douglas on the south. The lower Cook Inlet is divided by a subsurface, transbasin arch which extends from Augustine Island eastward to Seldovia. The character of reflections on opposite sides of this arch is different, so the arch probably influenced the type of deposition on the north and south sides.

There are numerous smaller anticlines which strike generally northeast and are bounded by high-angle reverse faults. The intersections of these smaller anticlines with the transbasin arch should provide structural closure in all directions. These intersections should be of prime interest for oil exploration.

Many smaller anticlines are evident in the shallow part of the seismic sections. The deepest reflectors show a considerably different structural style. The deeper folds are much broader and some do not extend into the shallower section.

The deeper reflectors onlap progressively southeastward as the Kenai Peninsula is approached from the northwest suggesting that the area near the Kenai Peninsula and the Barren Islands formed a sill of the basin of deposition.

AAPG Search and Discovery Article #90976©1976 AAPG-SEPM-SEG Pacific Section Meeting, San Francisco, California