Boulton H Gas Production

Tullow Oil PLC
15 March 2004

Tullow Oil plc
15th March 2004


                                 Tullow Oil plc
              Commencement of Production from Boulton H Gas Field

Following the successful completion of the Boulton H development well, 44/
22b-H1x, production commenced on 6th March from this gas field, situated in the
UK Southern North Sea. The initial production rate has been measured at nearly
140mmscfd gross.

Boulton H is the last field to be brought on production as part of the five
field CMS III development programme, which has been developed using the
production and transportation facilities of the Caister Murdoch System (CMS),
located some 115 miles north east of the Lincolnshire coast. Tullow has a 14.1%
unitised equity in CMS III.

Production from the five fields, Murdoch K, Hawksley, McAdam, Watt, and now
Boulton H, originates from a number of different Carboniferous reservoirs. The
current combined production from the fields is 310mmscfd gross.

In addition to production from the new well, the additional compressor unit
installed as part of the CMS III development programme is fully operational on
the Murdoch platform. This doubles the CMS compression capacity and boosts
overall CMS production by around 15%. The added compression allows ample
provision for handling future developments. Tullow is currently reappraising a
number of discoveries in this area using the latest seismic technology.

Partners in the CMS III development are:
Tullow Oil UK Limited                             - 14.1%
ConocoPhillips (U.K.) Limited (operator)          - 59.5%
GDF Britain Limited                               - 26.4%

Aidan Heavey, Tullow's CEO stated: 'We congratulate ConocoPhillips on bringing
the CMS III project to a successful conclusion. The CMS III project demonstrates
the successful application of modern technology to existing discoveries and we
look forward to further value-creating initiatives in the area, via both new
drilling and third party business.'

For Further Information Contact:

Tullow Oil plc ([phone])
Aidan Heavey
Tom Hickey
John Lander

Citigate Dewe Rogerson ([phone])
Martin Jackson

Murray Consultants ([phone])
Joe Murray

Notes for Editors

Tullow Oil plc is one of the leading Independent International Oil & Gas
Exploration and Production companies in Europe. Tullow is quoted on the London
and Irish stock exchanges (symbol TLW) and is a member of the FTSE 250 Index.

Strategy

Tullow's strategy is to build strong and secure cash flow from low risk
production acreage while applying discretionary funds to exploration territories
with high potential. These activities will be undertaken in a manner that
reflects a genuine concern for the environment and the health and safety of all
personnel.

Production and Development Assets

Tullow has interests in over 50 exploration and production licences spread over
three core areas:  UK North Sea, West Africa and South Asia.

In the North Sea, Tullow's principal interests are in the CMS (where Monroe
exploration well is currently drilling) and the Thames/Hewett group of licences
in addition to the operatorship of the Bacton onshore gas-processing terminal.

The Espoir field in Cote d'Ivoire, West Africa, is Tullow's principal source of
international production.  Tullow is also active in exploration and development
programmes in Cameroon and Gabon.

In South Asia, Tullow has production and exploration interests in Pakistan and
exploration activities in India.  In Bangladesh, a three well drilling programme
in Block 9 is under way.

For further information see www.tullowoil.com


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