Exploration • Drilling • Field Services
Mixed results dominate African exploration activities
The latest exploration results from Africa show the presence of both conventional and unconventional resources. Eugene McCarthy reports.
Eugene McCarthy informa que los últimos resultados de exploración en África mostraron la presencia de recursos convencionales y no convencionales.
Neueste Explorationen in Afrika zeigen das Vorhandensein von sowohl konventionellen als auch unkonventionellen Ressourcen. Eugene McCarthy berichtet.
O
phir Energy has announced results from the Taachui-1 and subsequent Taachui-1 ST1 well in Block 1, Tanzania,
resulting in a new gas discovery. Ophir holds 20% of Blocks 1, 3 and 4. BG Group operates with 60% (Fig. 1). Te Taachui-1 well was drilled by
the Deepsea Metro I drillship close to the western boundary of Block 1. For operational reasons this well was sidetracked to be completed as the Taachui-1 ST1 and was drilled to a total depth of 4,215m measured depth (MD). Te well encountered gas in a single
gross column of 289m within the targeted Cretaceous reservoir interval. 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 1 trillion ft3
. Te size
of the gas column is such that the discovery could extend into a second compartment to the west that has the potential to be a
similar size. An appraisal well is required to confirm this upside and is under consideration by the joint venture partners. A drill stem test will now be performed
on the Taachui discovery with results expected soon. Nick Cooper, CEO, commented: “Te
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. Te 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 ft3
are now approaching the
threshold needed to underpin a potential third LNG train from Blocks 1, 3 and 4.” Less successful has been the company’s
efforts with the Affanga Deep-1 well in the Gnondo Block offshore Gabon. Te well encountered thinner than expected sandstone sections with poor reservoir
Fig. 1. BG holds a 60 per cent stake in the Tanzanian blocks.
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