Russia 's biggest oil producer OAO Rosneft (ROSN.RS) said Thursday it added more hydrocarbons to its reserves than it produced in 2010, posting a reserve replacement rate of 106%.

Rosneft's proven reserves totaled 22.77 billion barrels of oil equivalent as of Jan. 1, which include 18.11 billion barrels of oil and 791 billion cubic meters of gas, in accordance with the Petroleum Resources Management System, or PRMS, standards.

Under the U.S. Securities and Exchange Commission standards, Rosneft's proven reserves totaled 15.20 billion barrels of oil equivalent, which include 13.75 billion barrels of oil and 247 billion cubic meters of gas.

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