- Created on Tuesday, 10 May 2011 16:50
The Sankofa -1A well drilled in its Cape Three Points Block, offshore Ghana, by the Ghana National Petroleum Corporation (GNPC) in conjunction with Vitol Upstream Ghana Limited (Vitol), encountered a net hydrocarbon column of approximately 36.3 metres comprising 33.1 metres of gas column and 3.2 metres of oil column in reservoir sands of Campanian age. The success of this well confirms the prospectivity of these Upper Cretaceous reservoir sands in the Tano/Cape Three Point Basin blocks offshore Western Ghana where the Jubilee field was discovered and is being developed.
The Sankofa -1A well, located 38km east of the Jubilee Field and 21km east of the Odum discovery in the West Cape Three Points block, has been suspended for possible re-entry. The target reservoir was successfully cored and a full wireline logging program was also run.
The well was drilled with the Blackford Dolphin Semi-Submersible drilling rig in water depths of 866 metres and reached a total depth of 3,704 metres MD (3,674 metres TVDSS). The Vitol Block covers a total area of 2,080 square kilometers in water depths ranging from 50 metres to 1,400 metres. This is the first exploration well to be drilled during the first phase (that is 3 years) of the three-phased seven-year exploration period provided for in the Petroleum Agreement entered into with the Government of Ghana and GNPC in 2006.
Vitol has 90% interest in the block while GNPC has 10% carried interest. GNPC has the option of acquiring an additional 10% paying interest on commercial discovery. Vitol also operates the offshore Cape Three Points South Block.
The Sankofa-2 well was drilled in 864 meters water depth at a distance of about 55 km from the coast to appraise the field , which was discovered by the Sankofa-1 well drilled by Vitol Upstream Ghana Limited in 2009. The well was tested and delivered a (constrained) rate of approximately 29,5 mmscfd of high quality gas and 1000 boepd of 52° API condensate. The appraisal well confirmed the presence of 35m net gas and condensate sands of the Cretaceous age with excellent reservoir characteristics. A six metre oil leg, which will be the object of further studies, was also encountered.
Initial evaluations indicate that the appraisal well has significantly increased the preliminary estimate of gas in place at the discovery, confirming Sankofa's potential to become the first development of non-associated gas from the Ghana offshore.
The Sankofa well results provide evidence of the success of the exploration activities carried out by the Eni-led consortium, in full compliance with safety and environmental protection standards.
Eni Ghana Exploration and Production Limited is the operator of the OCTP license with a 47.22% interest, Vitol Upstream Ghana Limited 37.78% and state company Ghana National Petroleum Corporation GNPC (15.00%). GNPC will have a back in option for an additional 5%.