Uganda: Tullow wells find two large oil fields

By OGJ editors
-- Tullow Oil PLC, acting as interim operator of Uganda’s EA1 onshore license until September 2011, has drilled two wells that proved oil accumulations at large seismic and gravity data anomalies.

The Jobi-East-1 well went to 563 m and discovered 20 m of net hydrocarbon-bearing reservoir in a fault block adjacent to the giant Jobi-Rii oil field. The well was drilled 4.4 km east of the Jobi-1 discovery well in a downdip location. Logging and sampling confirmed the presence of oil in two zones of high-quality reservoir totaling 15 m of net pay. The well also logged and sampled gas in sands totaling 5 m of net pay.

An accelerated drilling campaign of as many as four Jobi-East appraisal wells is planned for the second half of 2011 to assess the full extent of this important new oil accumulation, the company said.

The Mpyo-3 well went to 513 m and intersected 21 m of oil-bearing reservoir sands at 340 m. The well was drilled 1.6 km southeast of Mpyo-1 in a downdip location within a fault block adjacent to the Mpyo-1 discovery. Logs confirmed the sands to be of good quality and to contain highly viscous oil similar to that encountered in Mpyo-1.

Tullow suspended both wells to allow future reentry to run production tests.

Subject to completion of the farm-down, Tullow will have a 33.33% interest in the EA1 license, and its partners will be Total SA and China National Offshore Oil Corp. with 33.33% each.

Tullow said, “The Jobi-East-1 and Mpyo-3 well results mark an excellent start to this next phase of our exploration and appraisal campaign in the Lake Albert Rift basin. We look forward to many more exciting wells as we endeavour to determine the total oil resource base which will underpin the basin-wide development preparations currently in progress.”

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