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Monday, May 26, 2014
Drilling in Ethiopia has not gone as hoped on the latest well drilled by Tullow Oil and Africa Oil Corp. Tullow reported that the Shimela-1 well drilled on the South Omo Block encountered water bearing reservoirs.
The well was drilled to test a prospect in a northwestern sub-basin of the vast Chew Bahir basin. The frontier wildcat well encountered lacustrine and volcanic rocks including almost 100 meters of net sandstone reservoir within siltstones and claystones. Trace thermogenic gas shows were recorded at 1,900 meters.
The Exalo 205 rig drilled Shimela-1 to a final depth of 1,940 meters. The rig will now be moved to drill the Gardim-1 wildcat well in a completely separate sub-basin, in the southeastern corner of the Chew Bahir basin.
Tullow operates the South Omo with a 50% interest and is partnered with Africa Oil with 30% and Marathon Oil 20%.
Commenting on the Shimela-1 well Angus McCoss, Tullow’s exploration director said: “Although the Shimela well only found traces of thermogenic gas, it has provided key data to continue to build our understanding of the north-western part of the Chew Bahir basin. The prospectivity at the Gardim-1 well, which is targeting an independent petroleum system in a separate south-eastern sub-basin, is not affected by this result.”
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