MOSCOW, June 30 (Reuters) - Kazakhstan may exceed its

previous oil production forecast by around 2% this year

following an upgrade to output at its largest Caspian oilfields,

Reuters calculations, based on data from state-owned energy

company KazMunayGaz, showed.

According to calculations, oil output in Kazakhstan may rise

this year to around 97.7 million metric tons, or 2 million

barrels per day, from a previous projection of 96.2 million

tons.

Kazakhstan, among the world's 10 biggest oil producers, has

persistently exceeded quotas set by OPEC+, an alliance between

the Organization of the Petroleum Exporting Countries and other

producers led by Russia.

KazMunayGaz raised its forecasts for oil output at the country's

largest oilfield, Tengiz, by 900,000. It also revised up

expectations for output at Kashagan by 200,000 tons and

Karachaganak by 360,000 tons.

U.S. major Chevron ( CVX ) embarked in January on a $48

billion expansion of Tengiz, which is one of the world's deepest

and most complex fields due to high sulphur levels and harsh

weather conditions.

Output at the field from January to May reached 15.9 million

tons, according to KazMunayGaz.

Kazakhstan produced 87.8 million tons last year.