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The Discoverer Americas rig. Image courtesy of Paul Joynson-Hicks /Statoil.

A joint venture between Norway’s Statoil and ExxonMobil made a new natural gas discovery at its Giligiliani-1 exploration well in offshore Tanzania.

The joint venture discovered an additional 1.2 trillion cubic feet of natural gas in place at Giligiliani-1, bringing total in-place volumes at the block to 21 trillion cubic feet.

The Giligiliani-1 discovery is located along the western side of block 2 at a water depth of 8,202 feet.

The discovery extends the proven gas play to the western part of the block and opens up additional prospects.

The new gas discovery was made in Upper Cretaceous sandstones.

“Our success rate in Tanzania has been high and opening up a new area will be key to continuing our successful multi-well programme,” senior vice president for Statoil’s exploration activities in the western hemisphere Nick Maden said.

The rig Discoverer Americas will now drill the Kungamanga prospect located in the central part of block 2.

The Giligiliani-1 discovery is the joint venture’s seventh discovery in the block.

Statoil operates the block and holds a 65 percent stake on behalf of state owned Tanzania Petroleum Development Corporation.

ExxonMobil Exploration and Production Tanzania Limited holds the remaining 35 percent.

The block covers 2,123 square miles with water depths between 4,921 and 9,842 feet.