Tullow has encountered oil in excellent quality sandstone reservoirs in the Enyenra-2A (formerly Owo) appraisal well in the Deepwater Tano license offshore Ghana. The appraisal and discovery well show evidence of good communication, confirming that the Owo (Enyenra) oil discovery is a major light oil field.
Situated about 4 miles (7 kilometers) south and down-dip of Owo-1, the well was drilled to appraise the Upper and Lower channels of the Enyenra oil field. Results from gathered data show that Enyenra-2A has intersected 69 feet (21 meters) of net oil pay in the Upper Channel and 36 feet (11 meters) of net oil pay in the Lower Channel.
Pressure data from the Upper Channel has also demonstrated that the oil is in communication with the Owo-1 well; and oil pressures in the Lower Channel suggest it may also be in communication with the deeper pools seen in the discovery well and its sidetrack. The Enyenra-2A well also tested a deeper Turonian fan where 16 feet (5 meters) of gas-condensate bearing sandstones were intersected.
Tullow stated that interpretation of the extent and thickness of this zone away from the well is ongoing. Drilled to a total depth of 13,891 feet (4,234 meters) by the Deepwater Millennium drillship, the Enyenra-2A well is located in a water depth of 5,492 feet (1,674 meters). Once operations are completed, the well will be suspended for later use.
The drillship will remain in the Deepwater Tano block to complete the drilling of the Tweneboa-4 well. The next appraisal well will be the Enyenra-3A, located up-dip to the north of the Owo-1 discovery. Tullow operates the block, holding a 49.95% interest; Kosmos Energy holds 18%; Anadarko Petroleum holds 18%; Sabre Oil and Gas holds 4.05%; and the Ghana National Petroleum Corporation holds a 10% carried interest.
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