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Employees and contractors at our Brae platform add profitable production from the North Sea. Other core regions include the U.S., Canada and Equatorial Guinea.

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United Kingdom

Assets

Reliability

Marathon has been producing oil and natural gas in the United Kingdom for more than 20 years. The Company's current holdings in the U.K. include the Company-operated Brae Complex and the Foinaven Field. Our European operations are based in Aberdeen, Scotland. Marathon's base assets offshore the U.K. represented 9 percent of our total international liquids sales and 13 percent of international gas sales in 2010.

Brae Complex

Marathon is operator and owns a 42 percent working interest in the South, Central, North and West Brae fields;
A 38 percent working interest in the East Brae Field; and
A 27.8 percent working interest in the Braemar Field.

The Brae Alpha platform and facilities act as host for the underlying South Brae Field, as well as the adjacent Central Brae and West Brae fields. The North Brae Field and the East Brae Field are gas-condensate fields.

The export of Brae Field liquids is via the Marathon-operated Brae-Forties pipeline, in which the Company has a 42 percent interest, and via the BP-operated Forties pipeline system to Cruden Bay in Scotland. Stabilized crude liftings are made at the Firth of Forth loading terminal near Edinburgh, Scotland.

On East and North Brae, low pressure operations projects continue to help maximize gas recovery and maintain high gas deliverability rates into the U.K. market.

SAGE

The Brae group owns a 50 percent interest in the outside-operated SAGE pipeline, which provides transportation for Brae and Beryl area gas and has a total wet gas capacity of approximately 1.1 billion cubic feet per day (bcfd). The SAGE terminal at St. Fergus provides processing for gas from the SAGE pipeline and processing for 1 bcfd of third-party gas.

Foinaven

Marathon holds a non-operated working interest in the Foinaven area, west of the Shetland Islands in water depths between 1,300 and 1,900 feet. The Company's working interests comprise a 28 percent stake in the main Foinaven Field, 47 percent of East Foinaven and 20 percent of the T35 and T25 accumulations.

The export of Foinaven liquids is via shuttle tanker direct from FPSO to market. All gas sales are to the non-operated Magnus platform for use as injection gas. Current upgrading of the FPSO will extend the life of this project through 2021.

Marathon Oil UK LLC
Marathon House
Rubislaw Hill, Anderson Drive
Aberdeen, AB15 6FZ, Scotland
Phone: +44 1224-80-3000
Fax: +44 1224-80-3190

Improving Brae Reliability

The Brae Complex is one of the most competitive mature assets in the U.K. North Sea. With investments in reliability improvements and other strategies, Marathon has extended the expected life of Brae. Higher reliability also means safer operations, increased production and reduced costs.

Marathon established a dedicated team in 2007 to focus on reliability and increase operational availability in the Brae field. The team aims to eliminate surprises through early warnings, focusing on condition based maintenance through regular monitoring of all critical equipment. Monitoring methods include vibration, lubrication analysis, thermography surveys, motor current monitoring, and collection and review of process data. Performance is also considered.

Marathon uses an Asset Health Report that lists approximately 200 items on rotating equipment on each installation that is surveyed continuously. The report gives the status of all critical machines at a glance to help avoid surprises. The team includes dedicated reliability and lubrication technicians to ensure that lubrication, a critical element for any rotating equipment, is done properly.

Even with this proactive approach, unexpected failures still occur, although at a much reduced level. Root cause analysis helps Marathon fully understand the cause of such failures and put measures in place to prevent recurrence. The Brae team also uses case histories to share knowledge across all three Brae platforms and other Marathon assets globally.

As part of the commitment to the highest standards of safety and reliability, Marathon made a significant investment in the Brae Field power generation system. Two new power generation units, each the size of a small house and weighing more than 250 tonnes total, came online in early 2011.

The Brae complex ranked number one in production efficiency according to the 2010 McKinsey analysis of assets in the U.K. North Sea. Marathon achieved 92.5 percent operational availability in 2010, and 92.9 percent in the first quarter of 2011.