Lake Albert oil discovery may be biggest yet


Lake Albert oil discovery may be biggest yet

UK-based Tullow Oil announced that results from its Ngassa-2 exploration well in Uganda’s Lake Albert Basin suggest a “significant” oil find that could be the largest in the basin.

The Ngassa-2 exploration well, located in the Kaiso-Tonya region of Block 2, encountered 7 m of oil pay in a 14-m gross sand. Pressure data acquired through logging operations indicates a potentially significant oil column down-dip that could fill the entire 150-sq-km closure.

Ngassa-2 is a deviated well drilled from the Angara spit, 3.5 km from the crest of the structure, to a total depth of 3,392 m beneath Lake Albert. Logging, downhole pressure testing and sampling confirmed the presence of moveable oil.

Wireline log characteristics indicate that the reservoirs seen in Ngassa-2 are equivalent to those encountered in the Kingfisher discovery some 40 km southwest, pointing to significant lateral reservoir extent. This de-risks the down-dip potential, the remaining amplitude-supported prospectivity within the overall Ngassa closure and the neighboring offshore prospects, such as Pelican.

Further offshore appraisal drilling is planned to test a deeper 15-m gross sand at the well location.

The well has been suspended for future production testing, thereby completing the company’s current Block 2 exploration program. Exploration drilling activity is expected to re-commence in late 2009 in Block 1.

Tullow has interests in three licenses in the Lake Albert Rift Basin in Uganda; it operates Block 2 with a 100% interest and has a 50% interest in Blocks 1 and 3A, which are operated by Heritage Oil (50%).


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