Tullow Encounters Oil Pay at Ntomme Appraisal

Kosmos Energy announced that the Ntomme-2A appraisal well, located in the Deepwater Tano Block offshore Ghana, has successfully encountered significant quantities of light oil. The well, located over 4 kilometers (2.7 miles) south of the Tweneboa-3 sidetrack which discovered the Ntomme field, was designed to test the potential for an oil leg beneath the previously-identified gas-condensate at Ntomme.

Results of drilling, wireline logs and fluid samples indicate that the well encountered 45 meters (148 feet) of high-quality stacked reservoir sandstones, including 39 meters (128 feet) of 35 degrees API gravity net oil pay. Pressure data from the well and the original discovery well suggests the potential for an oil column at Ntomme of approximately 125 meters (410 feet) below the gas-condensate accumulation.

Paul Dailly, Senior VP of Exploration, stated, "The presence of a significant oil leg at Ntomme is a great result for Kosmos Energy. Ntomme was originally identified as a gas-condensate discovery; however, this well confirms the majority of resources to be oil. The result enhances both the momentum and value of our near-term development of the TEN project, which includes Tweneboa, Enyenra, and Ntomme. It is an excellent start to our active drilling program in 2012."

The Ntomme-2A well was drilled to an interim depth of 3,905 meters (12,812 feet) in water of 1,730 meters (5,675 feet). The well is currently being deepened to a total depth of 4,010 meters (13,156 feet). Following the completion of drilling operations, a drill stem test of the well is planned.

Operational Update

WCTP and DT Blocks Offshore Ghana

On the West Cape Three Points Block, Kosmos anticipates significant near-term appraisal activities at the Teak discovery. The Teak-4A appraisal well is planned to commence late in the first quarter 2012. In addition, the Company plans to perform a drill stem test and further appraisal drilling at Teak immediately following the Teak-4A well.

On the Deepwater Tano Block, the Enyenra-1 well, which was a redrill of the Owo-1 discovery well, was recently completed. A flow test at Enyenra-1 is underway to test field wide reservoir connectivity, with pressure gauges deployed in the Enyenra-2A and Enyenra-3A wells. Enyenra-3A (to the north) and Enyenra-2A (to the south) are approximately 14 kilometers (8.7 miles) apart. Following the flow test, the Enyenra-4A well, which will be located an additional 6.8 kilometers (4.2 miles) south of Enyenra-2A, will begin drilling. A declaration of commerciality and plan of development for the TEN project is expected to be submitted to the government of Ghana in the third quarter of 2012.

Kosmos Energy holds an 18 percent interest in the Deepwater Tano Block and a 30.875 percent operated interest in the West Cape Three Points Block offshore Ghana. The Company's working interest in the Jubilee Unit is 24.1 percent.

New Ventures

Offshore Morocco, the Company's planned 5,000 square kilometer 3D seismic data acquisition in the Agadir basin is progressing as planned. Approximately half of the data to be acquired covers the Essaouira Block with the remainder in the Foum Assaka Block. Of the Essaouira Block planned 3D, nearly 80 percent has been performed to date. The Foum Assaka planned 3D will immediately follow completion of the Essaouira 3D. The Company anticipates full completion of its 3D program in April 2012, followed by approximately six months for processing and interpretation.

Kosmos announced that it has negotiated a Production Sharing Contract for exploration on the Fako Block onshore Cameroon. The Fako Block, which borders the southeast portion of the Company's Ndian River Block, covers approximately 1,290 square kilometers gross (320 thousand acres). Kosmos operates the Fako Block area with a 100 percent working interest and a commitment to gravity and magnetics work in the initial exploration phase.


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