Athabasca Oil Sands Project (AOSP)

The AOSP is a joint venture among Marathon Oil Canada (20 percent), Shell Canada (60 percent) and Chevron Canada (20 percent). Shell is the operator. The AOSP's base project encompasses the Muskeg River Mine and the Scotford Upgrader. At full production, the mine's current gross production is 155,000 bpd of bitumen, a naturally occurring heavy oil.

Expansions

Given the significant resource base, the AOSP joint venture plans to increase production over the next 10 to 20 years. Expansion 1 is currently under construction and will add mining and extraction facilities at the new Jackpine Mine located on the east side of Lease 13. This expansion, which is anticipated to be in full production in 2011, will also provide expanded froth treatment facilities and an increase in capacity at the Scotford Upgrader. After Expansion 1 is
complete, Marathon will have more than 50,000 bpd of production and upgrading capacity in the Canadian oil sands.

In addition, further expansions and debottlenecking opportunities exist, providing Marathon with a secure production stream for decades.