The Droshky No.1 well, previously called Troika Deep, lies about 137 miles (220 km) south-southwest of Venice, Louisiana, in about 2,900 feet (884 meters) of water.
The well was drilled to 21,190 feet, and encountered a reservoir with about 250 of net oil pay, the Houston-based company said.
Marathon, which owns a 100 percent interest in the find, has started to drill up to two sidetrack wells, which will be followed by engineering development studies.
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