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RNS Number : 7236D 
Tullow Oil PLC 
08 December 2009 
 

News Release 
 
 
 
 
 
 
Successful appraisal well drilled on the Odum field 
 
8 December 2009 - Kosmos Energy, the operator of the Odum-2 appraisal well 
offshore Ghana, in which Tullow Oil plc (Tullow) is a 22.896% partner, today 
issued the following press release. 
 
 
DALLAS, Texas, December 8, 2009 - Kosmos Energy announces today that the Odum-2 
appraisal well confirmed the company's Odum oil discovery made in early 2008 
offshore the Republic of Ghana on the West Cape Three Points Block. The results 
of drilling, wireline logs and reservoir fluid samples show the Odum-2 well 
penetrated net hydrocarbon-bearing pay of 20 meters (66 feet) in high-quality 
stacked sandstone reservoirs over a gross interval of 182 meters (597 feet). The 
well is about 4 kilometers (km) northeast of the Odum-1 well, which is 
approximately 18 km east of Kosmos' Mahogany-1 exploration well and the Jubilee 
oil field. Kosmos is operator of the West Cape Three Points Block. 
 
 
The Odum-2 well encountered 20 meters (66 feet) of net oil pay in two intervals 
that appear to be in static pressure communication with the Odum-1 well. The 
Odum-2 well encountered an oil-water contact 58 meters (190 feet) below the 
lowest-known oil in the Odum-1 well, extending the known oil column beyond the 
deepest oil seen in the Odum-1. Reservoir fluid samples recovered indicate an 
oil gravity of approximately 18-19 degrees API. The Odum-2 well was drilled by 
the "Atwood Hunter" semi-submersible rig to a total depth of 2,506 meters (8,222 
feet) in a water depth of 816 meters (2,677 feet). 
 
 
"We are pleased that we have successfully confirmed the second of our four oil 
and gas discoveries to date offshore Ghana," said Brian F. Maxted, Kosmos Chief 
Operating Officer. "The Odum-2 well validates the upside potential of the 
Campanian play on the West Cape Three Points Block, which has been determined to 
be separate from the Jubilee Field play. We will continue to evaluate the well's 
results." 
 
 
Kosmos has drilled nine consecutive successful exploration and appraisal wells 
offshore Ghana for a 100 percent success rate in the region. 
 
 
Following the drilling of the Odum-2 well, the "Atwood Hunter" will be moved to 
the adjacent Deepwater Tano Block where it will drill the Tweneboa-2 appraisal 
well that will evaluate the most recent oil find made by Kosmos and its block 
partners in the area. Kosmos and its block partners are currently drilling the 
Mahogany Deep-2 appraisal well using the "Aban Abraham" drillship. 
 
 
West Cape Three Points Block 
Kosmos Energy is the operator of the West Cape Three Points Block in which the 
company holds a 30.875% interest.  An affiliate of Anadarko Petroleum 
Corporation (NYSE: APC) has a 30.875% interest; an affiliate of Tullow Oil plc 
(LSE: TLW) has a 22.896% interest; the EO Group has a 3.5% interest; Sabre Oil & 
Gas has a 1.854% interest; and GNPC has a 10% carried interest. 
 
 
Deepwater Tano Block 
Kosmos holds an 18% interest in the Deepwater Tano Block.  An affiliate of 
Tullow Oil plc (LSE: TLW) operates the block with a 49.95% interest.  An 
affiliate of Anadarko Petroleum Corporation (NYSE: APC) has an 18% interest; 
Sabre Oil & Gas has a 4.05% interest; and GNPC has a 10% carried interest. 
 
 
 
 
FOR FURTHER INFORMATION CONTACT: 
+-------------------------+-------------------------+-------------------------+ 
| Tullow Oil plc          | Citigate Dewe Rogerson  | Murray Consultants      | 
| (+44 20 8996 1000)      | (+44 207 638 9571)      | (+353 1 498 0300)       | 
| Angus McCoss            | Martin Jackson          | Joe Murray              | 
| Chris Perry             | George Cazenove         | Ed Micheau              | 
| James Arnold            |                         |                         | 
+-------------------------+-------------------------+-------------------------+ 
 
 
 
 
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 over 85 
exploration and production licences across 23 countries and focuses on four core 
areas: Africa, Europe, South Asia and South America. 
 
 
In Africa, Tullow has production in Gabon, Côte d'Ivoire, Mauritania, Congo 
(Brazzaville) and Equatorial Guinea and two large appraisal and development 
programmes in Ghana and Uganda. Tullow also has exploration interests in Gabon, 
Côte d'Ivoire, Liberia, Sierra Leone, Mauritania, Senegal, Congo (DRC), 
Tanzania, Madagascar, 
Namibia and Angola. 
 
 
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 area. The company also has interests offshore the Netherlands and 
Portugal. 
 
 
In South Asia, Tullow has exploration and production in Pakistan and Bangladesh. 
In South America, Tullow has exploration interests in Guyana, French Guiana and 
Suriname. 
 
 
For further information please refer to our website at www.tullowoil.com. 
 
This information is provided by RNS 
            The company news service from the London Stock Exchange 
   END 
 
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