Kingfisher Well Update

Tullow Oil PLC 16 February 2007 Tullow Oil plc - Kingfisher Well Update - Uganda 16 February 2007 - Heritage Oil, the operator of the Kingfisher-1 exploration well in Uganda, in which Tullow Oil plc ('Tullow') is a 50% partner, yesterday evening issued the following press release: HERITAGE OIL TO PRODUCTION TEST DEEPER HORIZONS IN KINGFISHER WELL IN UGANDA Calgary, Alberta, February 15, 2007 - Heritage Oil Corporation (TSX: HOC) today announced that it is preparing to production test deeper intervals in the Kingfisher-1A deviated exploration well in Block 3A, Uganda. The Company is planning to test three intervals with a total thickness of 44 metres between 2,260 and 2,367 metres. A shallower interval, at a depth of 1,783 metres, was tested successfully in the Kingfisher-1 well in November 2006, producing 4,120 bopd over a 10 metre interval. The tested oil was light (c. 30degrees API) and sweet with a low gas-oil ratio and some associated wax. Flow data from the test indicated the reservoir had an extremely high permeability of over 2,000 milliDarcies. Kingfisher-1A was drilled to a total depth of 3,195 metres, which was determined to be close to the limit of the rig's operational capability. Wire-line logs and formation pressure testing have evidenced encouraging indications of hydrocarbons over the planned test intervals, the thickest of which is 21 metres. Heritage currently anticipates that it will commence testing within 10 days. The test program is scheduled to take up to three weeks. Test equipment has remained at the wellsite following the initial successful test of the Kingfisher-1 well. Further details about Heritage's exploration activities in Uganda, including acquiring a 3D seismic survey and further appraisal drilling to evaluate the deepest potential of the basin will be announced when the results of the test program are available. Heritage is the Operator of Block 3A in Uganda with a 50% equity interest in the license, with Tullow Oil holding the remaining 50% interest. For further information contact: Tullow Oil plc Citigate Dewe Rogerson Murray Consultants (+44 20 8996 1000) (+44 20 7638 9571) (+353 1 498 0300) Martin Jackson Joe Murray Chris Perry Angus McCoss 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 250 Index. The Group has interests in over 100 exploration and production licences across over 20 countries and focuses on three principal 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), Mauritania 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),Tanzania, Madagascar, Angola and Ghana. In South Asia, Tullow has exploration and production in Pakistan and Bangladesh and high impact exploration activities in India. Following the recently completed acquisition of Hardman Resources Limited, Tullow also has high impact exploration interests in French Guiana, Suriname and the Falkland Islands. 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

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