History
The Avak structure was first recognized from seismic and gravity surveys in the National Petroleum Reserve No. 4 (NPR4) by the U.S. Navy during the period from 1943 to 1953. The Navy drilled the Avak 1 well in 1951, and encountered deformed rocks from near the surface to a total depth of 1,225 m (4,019 ft). This led to the suggestion that Avak might be an impact structure.
The Avak structure provides the structural trap for the natural gas in the adjacent South Barrow and East Barrow gas fields. These fields have accumulated about 37 bcf of natural gas in Jurassic sandstones.
In 1996, geologists from the U.S. Geological Survey found geologic evidence that indicated that the Avak structure was a meteorite impact structure. The presence of planar deformation features (PDFs) was reported in 1995, so Avak is considered to a "confirmed" impact structure
Read more about this topic: Avak Crater
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