Marathon added 143 million boe in proved reserves (107 percent of 2006 production) through discoveries, extensions, improved recovery and revisions of previous estimates, principally in Libya and Equatorial Guinea. In addition, 3 million boe were added through acquisitions. At year-end 2006, Marathon had estimated proved reserves of 1.262 billion boe with a reserve life of 9.7 years, based upon 2006 production from continuing operations.
Property acquisition, exploration and development costs incurred for oil and natural gas producing activities during 2006 were $2.648 billion, which includes capitalized asset retirement costs of $295 million. Additionally, Marathon's share of costs incurred for oil and natural gas producing activities by equity method investees during 2006 was $4 million.
"Marathon has continued to achieve strong proved reserve replacement performance over the past five years," said Clarence P. Cazalot, Jr., Marathon president and CEO. "We have delivered on this important measure of success through a balanced exploration program, improved recoveries and other enhancements to our base business, as well as with select acquisitions of assets that hold substantial resource potential.
"In addition, over the past five years we increased our total resource base by approximately 86 percent, from 2.1 billion to 3.9 billion barrels of oil equivalent. This expanded resource base will drive our future reserve additions and fuel our long-term, profitable production growth."
For the three-year period ended December 31, 2006, Marathon added net proved reserves of 648 million boe, excluding dispositions of 48 million boe, while producing 380 million boe, for a three-year reserve replacement of 171 percent. Costs incurred for oil and natural gas producing activities for this same three-year period were $6.163 billion, which includes capitalized asset retirement costs of $516 million. Additionally, Marathon's share of costs incurred for oil and natural gas producing activities by equity method investees was $165 million for these three years.
At year-end 2006, approximately 40 percent of the Company's proved reserves were located in Organization for Economic Cooperation and Development (OECD) countries, with the remaining reserves located in Marathon's African operations in Equatorial Guinea, Gabon and Libya. Of the total 1.262 billion boe in proved reserves, 54 percent are liquid hydrocarbons and 46 percent are natural gas.
Additionally, 68 percent of Marathon's proved reserves were developed at year-end 2006. Of the 405 million boe of proved undeveloped reserves at year- end 2006, less than 10 percent of the volume is associated with projects that have been included in proved reserves for more than three years, while 11 percent were added during 2006 in Libya, Norway, U.S. resource plays and other areas.
Third-party consultants are engaged to prepare independent reserve estimates for fields that make up 80 percent of our reserves over a rolling four-year period. Marathon met this goal for the four-year period ended in 2006.
Estimated Proved Reserves of Liquid Hydrocarbons & Natural Gas (millions of barrels of oil equivalent) U.S. Europe Africa Discontinued Total Operations As of December 31, 2005 390 179 682 44 1,295 Extensions, discoveries & other additions 16 18 19 4 57 Improved recovery 3 0 0 0 3 Revisions of previous estimates 1 9 72 1 83 Purchases of reserves in place 0 1 2 0 3 Sales of reserves in place 0 0 0 (45) (45) Production (60) (25) (45) (4) (134) As of December 31, 2006 350 182 730 0 1,262
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