Tullow Oil Mputa-4 appraisal

Tullow Oil PLC
02 October 2007


Successful Mputa-4 appraisal well in Uganda

2 October 2007 - Tullow Oil plc (Tullow) announces the successful drilling and
logging of the Mputa-4 appraisal well in Uganda's Block 2 which the Group
operates with a 100% interest.

Mputa 4 is located 1km east of the Mputa-1 discovery well and was drilled to
test an adjacent fault block. The well reached a total depth of 1,073m and
encountered three separate oil bearing zones with a total net pay of 15.4m.
Downhole pressure testing and sampling indicated moveable light sweet crude with
very good permeabilities as seen in the other Mputa wells.

Mputa-4 is the third and final well being drilled as part of the Kaiso-Tonya
appraisal programme and has proved the lateral extent of oil bearing reservoirs
across the region. The data from this programme, which includes ongoing 3D
seismic and the possibility of further production testing on existing wells,
will help to determine the ultimate reserve potential of the area and provide
critical information for the Early Production System development.


Commenting today, Aidan Heavey, Chief Executive of Tullow said:

'We are very pleased with the results of the three-well appraisal programme in
the Kaiso-Tonya area. The programme, which was completed on time and within
budget, has improved our understanding of the ultimate reserve potential of this
onshore region, and will be further enhanced over the coming months by the
results from the ongoing 3D seismic acquisition. Activity in Uganda continues
apace with the high impact Ngassa well scheduled to spud in October.'


For further information contact:

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



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 24 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


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