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Tullow Oil Achieves Good Result On Jubilee Field Offshore Ghana

05-07-2008

Tullow Oil's Mahogany-2 appraisal well on the Jubilee field off Ghana intersected a column of light oil.  Results of drilling, wireline logs and samples of reservoir fluid indicate that Jubilee is a single continuous stratigraphic trap extending at least 11 kilometers (6.8 miles) to the Hyedua-1 discovery well in the adjacent Deepwater Tano licence.

Mahogany-2, which lies in the West Cape Three Points licence, is the first appraisal well on the Jubilee field and is targeting the Turonian turbidite sandstones encountered in the Mahogany-1 and Hyedua-1 discovery wells.  The well encountered a gross reservoir interval of 243 metres (797 feet), containing 63 metres (206 feet) of high quality stacked reservoir sandstones, and net hydrocarbon-bearing pay of 50 metres (164 feet).  Results of logging and pressure testing indicate that the combined hydrocarbon columns are in excess of 600 metres (1,968 feet).

Analysis of the oil samples from the Mahogany-1 discovery well suggested the potential for a gas cap at the Mahogany-2 location.  However, no gas cap has been encountered in the well, thereby indicating the potential for the Jubilee field to extend further up-dip of that location.

A limited flow test will now commence on Mahogany-2 to determine potential production rates from these excellent quality reservoirs and to collect further oil samples for analysis.  Testing is expected to take approximately four weeks and the well will then be suspended for use as a potential development well.

Mahogany-2 was drilled to a total depth of 3,443 metres (11,295 feet) by drillship Songa Saturn in water depths of 1,080 metres (3,543 feet).  Three more Jubilee appraisal wells are planned for 2008 and will be drilled by Dolphin Drilling semisubmersible Blackford Dolphin.  The next Jubilee appraisal well, Hyedua-2, is expected to commence in July in the adjacent Deepwater Tano licence.

Partners include operator Kosmos Energy with 30.875 percent, Anadarko Petroleum with 30.875 percent, Tullow Oil with 22.9 percent, E.O.Group with 3.5 percent, Sabre Oil & Gas with 1.85 percent and Ghana National Petroleum Corp. with 10 percent carried interest.  Tullow is the Unit Operator of the Jubilee field.