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BG Group and Ophir strike gas at Tanzania offshore well

05th June 2014

Ophir Energy has announced a new gas discovery at the Taachui-1 and subsequent Taachui-1 ST1 well in Block 1, Tanzania

BG Group and Ophir strike gas at Tanzania offshore well
The size of the gas column is such that the discovery could extend into a second compartment to the west which has the potential to be of a similar size

The Taachui-1 well was drilled by the Deepsea Metro I drillship close to the western boundary of Block 1. The well was side-tracked for operational reasons to complete as the Taachui-1 ST1 well and was drilled to a total depth of 4,215 metres.

The well encountered gas in a single gross column of 289 metres within the targeted Cretaceous reservoir interval. Net pay totalled 155 metres. Observed reservoir properties are in-line with those encountered at Mzia, the other Cretaceous-aged discovery on Block 1.

Estimates for the mean recoverable resource from the discovery are around 28 billion cubic metres.

The size of the gas column is such that the discovery could extend into a second compartment to the west which has the potential to be of a similar size. An appraisal well will be required to confirm this upside and is under consideration by the JV partners.

Ophir holds 20 per cent of Blocks 1, 3 and 4. BG Group operates with 60 per cent.

A drill stem test will now be performed on the Taachui discovery with results expected before the end of June.

“The Taachui-1 discovery continues the 100 per cent drilling success rate on Blocks 1, 3 and 4 and adds further resource to support the LNG development in Tanzania,” said Nick Cooper, Ophir CEO. “The result is important to Ophir for two reasons: firstly it extends the proven hydrocarbon system to the eastern limit of, and partly de-risks, Ophir’s East Pande permit on which the Tende-1 well will be drilled later in 2014; secondly the aggregate recoverable volumes of around 16.7 trillion cubic feet are now approaching the threshold needed to underpin a potential third LNG Train from Blocks 1, 3 and 4.”

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