Well Update - Replacement

Tullow Oil PLC
09 October 2007


          This release replaces RNS no. 3633F entitled 'Well Update'.



Shallow Water Tano exploration well update


9 October 2007 - Tullow Oil plc (Tullow) announces that the 1N-3X appraisal well
in the Shallow Water Tano block has been drilled to a total depth of 3,075m.
Following the results of logging operations the well will not be flow tested.

The 1N-3X well tested a previously undrilled fault block in this near-shore
shallow water licence.  The objective was to determine if modern drilling
techniques, designed to reduce formation damage, could be used to achieve
commercial flow rates from the low permeability Albian reservoirs encountered in
previous wells. Hydrocarbon bearing sandstones were encountered in this well but
logging results indicated that the sandstones would not flow at commercial
rates. The well has therefore been plugged and abandoned.

Future operations in Shallow Water Tano will continue to focus on further
appraisal of existing discoveries and delineation of exploration prospects in
this block, which is updip of Tullow's recent Santonian reservoir discoveries,
Mahogany and Hyedua.  These discoveries were made in June and August this year
in the adjacent Deepwater Tano and West Cape Three Points licences.

Tullow (31.5%)  operate Shallow Water Tano  on behalf of partners Interoil
(31.5%), Al Thani (22.5%), Sabre Oil and Gas (4.5% carried) and GNPC (10%
carried).

Tullow  is also the operator of the Deepwater Tano licence (49.95%) and a
partner in the West Cape Three Points licence (22.9%).



For further information contact:

Tullow Oil plc                     Citigate Dewe Rogerson              Murray Consultants
([phone])                 ([phone])                  ([phone])
Tom Hickey                         Martin Jackson                      Joe Murray
Chris Perry                        Kate Delahunty


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 120 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.



In Africa, Tullow has exploration and production in Gabon, Cote d'Ivoire, Congo
(Brazzaville), Mauritania and Equatorial Guinea and a gas field development in
Namibia. Tullow also has exploration programmes in Mauritania, Senegal,
Cameroon, Uganda, Congo (DRC), Tanzania, Madagascar, Angola and Ghana.



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 www.tullowoil.com

                                      ENDS


                      This information is provided by RNS
            The company news service from the London Stock Exchange  ND

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