Colorado

Marathon's leasehold position in the Piceance Basin of Colorado, includes approximately 9,000 net acres, with net risked recoverable resources estimated to be as much as 900 billion cubic feet (bcf). The acreage, in Garfield County in the Greater Grand Valley Field Complex, is flanked by, and on-trend with, adjacent production.

The Piceance Basin is currently one of the most active basins in North America. The primary reservoir is the Williams Fork Formation of the Mesaverde Group, which is characterized as a massive 3,000-foot thick sequence of stacked over-pressured channel sands in a continuous gas accumulation. The target reservoir is encountered at measured depths of 6,500 to 8,500 feet. Marathon anticipates drilling approximately 750 to 900 wells over the next 10 years. Drilling and production operations started in 2007. The Company is currently running four rigs, and anticipates drilling approximately 50 wells within the Basin during 2008. This program has the potential to add net peak production of up to 170 mmcfd of gas by 2014.

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Piceance Fact Sheet (PDF 849KB)