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Shell Upstream International Director Andy Brown. Image courtesy of Shell/Youtube.

Shell discovered a “substantial” frontier exploration reservoir in offshore Gabon, it said Wednesday.

The well Leopard-1 encountered a gas column with a 656 feet net gas pay in a pre-salt reservoir.

Leopard-1 is located about 90 miles off Gabon’s coast, west of Gamba.

The well was drilled in water depths of 6,922 feet to a total vertical depth of 16,610 feet.

Shell and its partner, China’s CNOOC, are planning to undertake an appraisal program to further determine the resource volumes.

“This latest deep water discovery is a testament to the innovation of our explorers in pursuing new plays, and application of our global sub-surface expertise,” Shell Upstream International Director Andy Brown said.

Leopard-1 was drilled in license BCD10.

Shell holds a 75 percent operating interest in the license and CNOOC holds a 25 percent interest.