Major oil discovery offshore Ghana

Tullow Oil plc (Tullow) announced recently that the Owo-1 exploration sidetrack in the Deepwater Tano licence offshore Ghana has significantly extended the column of high quality light oil discovered by the Owo-1 well.

Results of drilling, wireline logs and samples of reservoir fluids confirm that Owo is a major new oil field. The Owo-1 well encountered 53 m of net oil pay and the sidetrack, drilled 0.6 km east of the Owo discovery well, encountered an additional 16 m of net oil pay in the lower part of the same channel system. Pressure data indicates that this oil pay is in communication with the reservoirs penetrated in the Owo-1 well and confirms at least 69 m of total net oil pay in a substantial gross oil column of 200 m. Beneath the Owo oil field, 13 m of net condensate pay was also discovered, with an additional 6 m of net gas pay logged in the deepest sand encountered. No water was encountered in any of the hydrocarbon bearing reservoirs in either well.


Following completion of logging operations the well will be suspended for future use in appraisal and development.

The Sedco-702 dynamically positioned semi-submersible drilled the Owo-1 sidetrack to a final depth of 3,998 m in water depths of 1,428 m. On completion of operations, the rig will remain in the Deepwater Tano block to drill the Onyina-1 exploration well which targets a large Campanian prospect between the Tweneboa and Jubilee fields.

Tullow (49.95 per cent) operates the Deepwater Tano licence and is partnered by Kosmos Energy Ghana (18 per cent), Anadarko Petroleum (18 per cent), Sabre Oil & Gas (4.05 per cent) and the Ghana National Petroleum Corporation (GNPC) (10 per cent carried interest).

Commenting on the discovery, Angus McCoss, Exploration Director, said, “The Owo-1 sidetrack has proved a very substantial 200 m gross oil column in the heart of the Owo oil field and new condensate and gas accumulations below. Appraisal wells are currently being planned to extend the main Owo oil discovery up-dip and down-dip, to appraise the adjacent Tweneboa oil and gas condensate accumulation and, to refine further our estimates of recoverable resources of both fields. The discovery of very material volumes of light oil in Owo and the fact that the oil is concentrated in high quality channel sands greatly enhances our outlook for the efficient future development of both the Owo and Tweneboa fields.”

Alain Charles Publishing, University House, 11-13 Lower Grosvenor Place, London, SW1W 0EX, UK
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