UPDATE 1-Rosneft builds reserves, replaces 180 pct of output
* Proven reserves up to 33 bln boe under SEC classification
* Reserve life at 24 years under current output rates
* Rosneft expects modest oil output growth (Adds detail, CEO quote)
MOSCOW, Jan 21 (Reuters) - Rosneft, Russia's top crude producer, reported an almost 180 percent hydrocarbon reserves replacement ratio in 2013 thanks to acquisitions and increased drilling, though the company expected only modest growth in oil output.
Rosneft's reserves life - or the amount of time they would last at current rates of production - amounted to 24 years, with 20 years for oil and 50 for gas.
Kremlin-controlled Rosneft, headed by Igor Sechin, a long-time ally of President Vladimir Putin, produces 40 percent of all Russian oil, in part thanks to its $55 billion acquisition of the Anglo-Russian TNK-BP oil firm last year.
As a state company it enjoys privileged access to enormous offshore hydrocarbon reserves that are off limits to its private competitors. It plans to develop its Arctic reserves in alliance with ExxonMobil, Eni and Statoil.
Rosneft said on Tuesday that under Petroleum Resources Management System (PRMS) criteria, its proven hydrocarbon reserves - the largest among the world's listed oil companies - rose to 41.8 billion barrels of oil equivalent (boe) from 39.1 billion boe a year earlier.
"During the past five years, the company has been steadily replacing over 100 percent of its production by adding new reserves. Resource base growth is one of the key elements of increasing shareholder value," Sechin said in a statement.
Under the more stringent U.S. Securities and Exchange Commission's (SEC) methodology, its proven hydrocarbon reserves rose to 33.0 billion boe as of Dec. 31, from 29.6 billion a year earlier.
As part of its buying spree, Rosneft last year acquired oil producer Taas-Yuryakh in East Siberia as well as Itera Oil and Gas Company.
Despite its vast reserves, Rosneft is pencilling in annual production growth of only 1 percent until 2017. Output growth should then accelerate to between 3 and 4 percent as new projects ramp up.
Rosneft plans to increase production of natural gas to 100 billion cubic metres (bcm) by 2020 from around 40 bcm in 2013. It has several projects that are due to come on line in the next couple of years.
It also wants to increase production at its major Vankor group of oilfield in East Siberia, where it expects to reach an output plateau of 500,000 barrels per day by 2019. (Reporting by Vladimir Soldatkin; Editing by Douglas Busvine and Jane Baird)
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