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Oil discovery in the Ngara-1 exploration well in Uganda

Tullow Oil plc (Tullow) announces that the Ngara-1 exploration well, which is located in the Butiaba region of Uganda Block 2, has encountered over 8 metres of net oil pay.

Located approximately one kilometre from the crest of the structure, the well was drilled to a total depth of 741 metres and has been successfully logged and sampled. Good quality basal sands were encountered with over 8 metres of net oil pay in a 17 metre gross reservoir interval with additional potential up-dip.

The Ngara-1 well is located approximately 3 km south of the Ngege-1 discovery and de-risks two adjacent traps within the Ngara fault block. Consideration will be given to these and other prospects as part of the next Block 2 drilling campaign which is expected to commence early in 2010.

The well is now being suspended as a future oil producer. The Ngara-1 well and the other discoveries made in Uganda will form part of the detailed basin development plan which the integrated project team is currently working on.

Commenting today, Angus McCoss, Exploration Director, said:
"Ngara-1 is the tenth discovery in the Victoria Nile Delta play and marks the end of a very successful opening phase of the Tullow-operated exploration campaign in the Butiaba region of Block 2. We are now planning to integrate all regional well and seismic data with the recently acquired gravity survey. The results from this work will further enhance our understanding of the subsurface and identify additional prospectivity within the region.

Preparations are now under way to commence a new drilling programme with our partner, Heritage Oil, in Block 1 in the fourth quarter of this year. We are also looking forward to the results from the Ngassa-2 well which remains on track to reach Total Depth in August."

For further information contact:

Tullow Oil plc Citigate Dewe Rogerson Murray Consultants
(+44 20 8996 1000) (+44 207 638 9571) (+353 1 498 0300)
Angus McCoss Martin Jackson Joe Murray
James Arnold George Cazenove Ed Micheau

Notes to Editors
Tullow is a leading independent oil & gas, exploration and production group, quoted on the London and Irish Stock Exchanges (symbol: TLW) and is a constituent of the FTSE 100 Index. The Group has interests in over 85 exploration and production licences across 22 countries and focuses on four core areas: Africa, Europe, South Asia and South America.

In Africa, Tullow has production in Gabon, Côte d'Ivoire, Mauritania, Congo (Brazzaville) and Equatorial Guinea and two large appraisal and development programmes in Ghana and Uganda. Tullow also has exploration interests in Gabon, Côte d'Ivoire, Liberia, Mauritania, Senegal, Congo (DRC), Tanzania, Madagascar, Namibia and Angola.

Tullow's European interests are primarily focused on gas in the UK Southern North Sea where it has significant interests in the Caister-Murdoch System and the Thames area. The company also has interests offshore the Netherlands and Portugal.

In South Asia, Tullow has exploration and production in Pakistan and Bangladesh. In South America, Tullow has exploration interests in Guyana, French Guiana and Suriname.

For further information please refer to our website at www.tullowoil.com.