Tweneboa Field

Tweneboa Field

In March 2009, the Tweneboa-1 exploration well, in the Deep Water Tano licence 25km from Jubilee, discovered a highly pressured light hydrocarbon accumulation of up to 1.4 billion barrels of oil equivalent.

The well encountered 21 metres of net pay on the edge of a giant 200 sq km fan system related to the Jubilee play. Intriguingly, the well also encountered a four-metre over-pressured oil-bearing sand and an over-pressured zone at total depth.

Tullow planned to carry out appraisal drilling to test core areas of the structure where thicker reservoir sections are mapped. The second well, Tweneboa-2, began drilling towards the end of 2009. In January 2010 Tullow announced that the well had encountered two separate hydrocarbon columns containing oil and gas-condensate legs. In total, 32 metres of net pay were encountered.

A significant exploratory appraisal programme is now scheduled for 2010 which will include up to four Tweneboa wells to allow Tullow to fully evaluate this giant fan system. The Sedco-702 rig has been contracted for this accelerated appraisal programme and commenced drilling at Owo-1 in June 2010.



Field characteristics

• Water depth 1,500m - 1,700m

• Tweneboa field comprises the eastern part of a bifurcating Turonian channel/fan system

• Proven gas/condensate in Upper Channel overlying oil in a Lower Channel

• Gas water contact unknown

• Oil water contact intersected by T-2


Field appraisal

• T-3 well to test frontal splay (Ntomme lobe) of a fan complex within stratigraphic/structural trap

• Excellent AvO support, Tw-3 will calibrate bright Ntomme anomaly

• Expected spud in 2H 2010

• T-4 targets a secondary channel within the easternmost part of the fairway

• Project team is in place to evaluate field development options




Additional information