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GHANA'S OIL FIELD THE JUBILEE OIL FIELD

In 2007, based on the results of the first two exploration wells, the Jubilee field partners and the Government of Ghana jointly took the early decision to proceed with the development of the Jubilee field. An Integrated Project Team (IPT) was rapidly assembled, bringing together major deepwater skills and experience from across the partnership.

In parallel, Tullow quickly developed a deepwater development drilling capability and a total of 16 wells have been drilled to date. First oil is scheduled for the fourth quarter of 2010, representing a record time from discovery to delivery of major deepwater production.

Offshore cape three points area in the western region of Ghana is the Jubilee field. this is currently the operational field for the start of production of crude oil in commercial quantities for the emerging oil industry of Ghana.the name jubilee is as a result of the period oil was discoverd in commercial quantities in Ghana. in 2007 Ghana celebrated 50 years of independence from Great Britain and that was exatly the period crude oil was discovered after several years of exploration works.hence the name of the field, Jubilee.

The Tullow operated Jubilee field, which straddles the Deep Water Tano (Tullow 49.95%) and the West Cape Three Points (Tullow 22.896%) licences, was discovered by the Mahogany-1 and Hyedua-1 exploration wells in 2007. The two wells were drilled five kilometres apart and intersected a large continuous accumulation of light sweet crude oil in excellent quality stacked reservoir sandstones.









Gross resource base

The Jubilee Unit Area is considered to have a gross resource base of 500 mmbo (P90) through a most likely 700 mmbo (P50) to an upside of 1,000 mmbo (P10). This resource base will be developed in several phases, of which Phase 1a is under way with first oil expected in Q4 2010.
Appraisal well

Six successful exploratory appraisal wells, Mahogany-2, Hyedua-2, Mahogany-3, Mahogany-4, Mahogany Deep-2 and Mahogany-5 have so far been drilled. Each of these discoveries has intersected considerable hydrocarbon columns. Mahogany-3, Mahogany-4, Mahogany Deep-2 and Mahogany-5 have also intersected potentially extensive underlying sands which will require further evaluation and appraisal.

In 2010, Tullow began a two well exploratory appraisal campaign in the southeast Jubilee Area. The first of these wells, Dahoma-1, was a bold down-dip well 11km away from Mahogany-3. Unfortunately the well was water bearing at this location and was Tullow's first unsuccessful well in Ghana after 12 previous successes. The next well, Mahogany-5, encountered 23 metres of net oil pay 2km eastwards of Mahogany-3.

The potential resource range for the southeast Jubilee Area, which is currently under review, is 100 million barrels (P90) to an upside 500 million barrels (P10) of oil.

Flow tests have been performed on Mahogany-1&2 and Hyedua-2 confirming that the Jubilee field is a highly productive and well-connected reservoir. In addition, a water injection test was conducted during the fourth quarter of 2009 demonstrating well communication over a distance of up to six kilometres with injection rates in excess of 23,000 barrels of water per day. The wells have demonstrated that they are capable of delivering in excess of 20,000 barrels of 37.6 API quality crude oil per day.

Production is currently ongoing at the Jubilee field

source: Tullow oil and GNPC