By Ian Walker

LONDON--Oil major Royal Dutch Shell PLC (RDSB.LN) said Wednesday the Leopard-1 well has encountered a substantial gas column, with around 200 meters net gas pay in a pre-salt reservoir, and it now plans an appraisal program to further determine resource volumes.

The well, which is located around 145 kilometers off the Gabonese coast, west of Gamba, was drilled in water 2,110 meters deep to a total vertical depth of 5,063 meters.

Shell is the operator of the well with a 75% interest. CNOOC Ltd. (CEO) has the remaining 25% interest.

Write to Ian Walker at ian.walker@wsj.com

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