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Tullow Oil plc - Drilling Update: Banda NW ST-1, Offshore Mauritania

    LONDON, May 7 /PRNewswire/ -- ROC Oil, a participant in the Banda NW
exploration well, in which Tullow Oil plc (Tullow) is also a partner, today
issued the following press release:

    "Roc Oil (Mauritania) Company, a wholly owned subsidiary of ROC,
advises that as at midnight (local time) on 3 May 2008, the Banda NW ST-1
sidetrack well had been suspended.

    The results of the wireline logging, Modular Dynamic Tester (MDT)
pressure testing and sampling indicate that Banda NW ST-1 intersected an 85
metre gross gas column, with 15 metres (18%) net gas pay and a 15 metre
gross oil column, with 10 metres net oil pay (67%). The fluid contacts were
as expected and the well is interpreted to be in communication with the
original Banda-1 discovery well drilled in 2002, approximately 2 kilometres
to the east. The Banda Field is in approximately 300 metres of water and
spans PSC Area A and PSC Area B.

    The Atwood 'Hunter' will commence with the planned well intervention
work on the Chinguetti Field, once it has completed the move from Banda NW
ST-1."


Participating Interests in the PSC Area A Joint Venture are: ROC Group Companies 4.155% PC Mauritania I Pty Ltd (Operator) 53.846% Tullow Oil plc 24.300% Mauritania Holdings B.V. 13.084% Fusion Mauritania A B.V. 3.000% FP Mauritania A B.V. 1.615% Participating Interests in the PSC Area B Joint Venture are: ROC Group Companies 3.693% PC Mauritania I Pty Ltd (Operator) 53.846% Tullow Oil plc 21.600% Mauritania Holdings B.V. 11.630% Premier Oil Mauritania B Limited 9.231% Commenting today, Aidan Heavey, Chief Executive of Tullow said: "The success of Banda NW and its sidetrack has presented a clear opportunity to drill an appraisal well in the east of the field to assess the size of this exciting oil and gas discovery. Additionally, data from these wells will prove invaluable in our evaluation of the remaining exploration potential of the offshore Mauritanian acreage." 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 100 exploration and production licences across 23 countries and focuses on four core areas: Europe, Africa, South Asia and South America. 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-Hewett areas and operates over 70% of its production. The company also has interests offshore the Netherlands and Portugal. In Africa, Tullow has exploration and production in Gabon, Cote d'Ivoire, Mauritania and Equatorial Guinea and two large appraisal and development programmes in Ghana and Uganda. Tullow also has exploration interests in Mauritania, Senegal, Congo (DRC), Tanzania, Madagascar, Namibia and Angola. In South Asia, Tullow has exploration and production in Pakistan and Bangladesh and high impact exploration activities in India. In South America, Tullow has high impact exploration interests in Trinidad and Tobago, French Guiana and Suriname.
For further information please refer to our website at http://www.tullowoil.com. Contact: Aidan Heavey Tom Hickey Chris Perry Tullow Oil plc +44-20-8996-1000 - or - Brian J. Rafferty Taylor Rafferty 212-889-4350
SOURCE Tullow Oil plc




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Related links:
  • http://www.tullowoil.com
    CONTACT:
    Aidan Heavey, Tom Hickey, or Chris Perry,
    +44-20-8996-1000, all of Tullow Oil plc; or Brian J. Rafferty of
    Taylor Rafferty, +1-212-889-4350, for Tullow Oil