GEORGETOWN, Feb 12 (Reuters) - A consortium led by Exxon

Mobil ( XOM ) is getting ready for a very active year for

exploration and production in Guyana amid upgrades that expanded

the capacity of some of its floating facilities and the expected

arrival of a fourth vessel, the head of the U.S. oil major in

Guyana said on Wednesday.

The group has requested environmental permits from Guyana's

government for its Longtail project, the first that will produce

non-associated gas, and to explore the Hamlet well in the

southeast portion of its massive Stabroek offshore block.

Longtail is expected to add up to 250,000 barrels per day

(bpd) of crude output capacity and 1 billion cubic feet per day

of natural gas production, said Alistair Routledge, president of

Exxon Guyana, in a press conference.