According to partner Ophir Energy the drillship Deepsea Metro I drilled Taachui-1 and the subsequent ST1 side track to a TD of 4,215 m (13,829 ft) MD.
The well encountered gas in a 289-m (948-ft) gross column within the target Cretaceous reservoir interval. Total net pay was 155 m (508 ft). Reservoir properties appear to be in line with those encountered at Mzia, the other Cretaceous discovery on the block.
Ophir estimates Taachi’s potential recoverable resource at around 1 tcf (28 bcm), adding that the gas column could extend into a second compartment to the west that could be of a similar size. However, this will need to be confirmed by appraisal drilling.
Results from a drillstem test on the Taachui discovery are expected to be issued before end-June.
Ophir CEO Nick Cooper said: “The Taachui-1 discovery continues the 100% drilling success rate on blocks 1, 3 and 4, and adds further resource to support the LNG development in Tanzania. 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 about16.7 tcf (470 bcm) are approaching the threshold needed to underpin a potential third LNG train from blocks 1, 3, and 4.”