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The well encountered 21 metres of net pay and was drilled to a depth of 3,593 metres and is currently being deepened to further assess the discovery and the up-dip limit of a potential deeper fan system.

The well was optimally located to penetrate multiple targets, including the edge of an undrilled major Turonian fan system. Further drilling will now be required to test core areas within this potentially giant stratigraphic trap where thicker Turonian reservoir sections are mapped. The upside area of approximately 200 square kilometres includes two de-risked prospective parts, Owo and Ntomme.

The Tweneboa-1 well was drilled by the Eirik Raude deepwater rig in a water depth of 1,148 metres some 25 kilometres west of the Jubilee Field.

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

Commenting today, Angus McCoss, Exploration Director, said:

"Tweneboa is another outstanding discovery offshore Ghana which maintains our 100% success rate in the region. Substantial upside has been identified and a material appraisal programme will follow. This result has the potential to deliver yet another transformational growth step for Tullow."

Contacts

Tullow Investor Relations Camarco (Media)

ir@tullowoil.com
Matthew Evans

(+44 20 3757 4980)
Billy Clegg
Georgia Edmonds
Rebecca Waterworth

Notes to editors

Tullow is an independent energy company that is building a better future through responsible oil and gas development in Africa. Tullow's operations are focused on its core producing assets in Ghana. Tullow is committed to becoming Net Zero on its Scope 1 and 2 emissions by 2030, with a Shared Prosperity strategy that delivers lasting socio-economic benefits for its host nations. The Group is quoted on the London and Ghanaian stock exchanges (symbol: TLW). For further information, please refer to: www.tullowoil.com.

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