HOUSTON, May 6 - A consortium led by Exxon Mobil XOM.N that controls all oil and gas output in Guyana produced 668,000 barrels per day (bpd) of oil last week, the U.S. company's head for the South American country, Alistair Routledge, said in a conference on Tuesday.

The group, which is working to install its fourth floating output facility after receiving it in Guyana's waters in February, in March produced 627,000 bpd. The 631,000 bpd average achieved in the first quarter was 3% higher year-on-year, data from the country's energy ministry showed last month.

(Reporting by Sheila Dang and Marianna Parraga)

((marianna.parraga@thomsonreuters.com))