Exploration Well Update

Tullow Oil PLC
10 October 2006


Tullow Oil plc - Kingfisher-1 Exploration Well Update


10 October 2006 - Heritage Oil, the operator of the Kingfisher-1 exploration
well in Uganda, in which Tullow Oil plc (Tullow) is a 50% partner, today issued
the following press release.



    Heritage Oil to production test Kingfisher-1 exploration well in Uganda


Heritage Oil Corporation (TSX: HOC) today announced that it is preparing to
production test the Kingfisher-1 exploration well in Block 3A, Uganda. The
Company is planning to test up to four intervals with a total net pay of 37
metres in a stacked sand and shale sequence that is typical of the basin. In
order to do so, drilling operations have been temporarily suspended.


The well has been drilled to a depth of 2,125 metres, and wireline logs and
formation pressure testing and sampling have evidenced encouraging indications
of hydrocarbons. Heritage anticipates that it will commence testing of the
Kingfisher-1 well within a month and the testing program is scheduled to take up
to three weeks.


The well encountered hydrocarbons within a section above the primary objective.
Drilling to the primary objective is planned to recommence after this initial
well testing operation has been completed. It is estimated that it could take a
further 60 days to reach target depth of between 3,000 and 4,000 metres.


Further details about Heritage's exploration activities in Uganda will be
announced when the results of the initial test program are available.


Heritage is the Operator of Block 3A in Uganda with a 50% equity in the license,
with Tullow Oil holding the remaining 50% interest.


For further information contact:

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


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 250 Index. The Group has interests in approximately 90
exploration and production licences across 17 countries and focuses on three
core areas: NW Europe, Africa and South Asia.


Tullow's NW Europe 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 60% of its production.


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


In South Asia, Tullow has exploration and production in Pakistan and Bangladesh
and high impact exploration activities in India.

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