SINGAPORE, Nov 20 (Reuters) - GS Caltex Singapore Pte Ltd said on Monday it has sold its first cargo of biofuel-blended marine gasoil to Maersk Oil Trading (MOT) at the world's largest bunker hub Singapore as it seeks to expand into lower carbon fuels.

The company delivered 1,000 metric tons of marine gasoil blended with 24% of Used Cooking Oil Methyl Ester (UCOME), to MOT's bunker barge on an ex-wharf basis on Nov. 8, said GS Caltex, the Singapore-based trading arm of South Korea's second-largest refiner.

Maersk said it cannot comment on individual deals.

(Reporting by Jeslyn Lerh and Florence Tan in Singapore; additional reporting by Jacob Gronholt-Pedersen in Copenhagen Editing by Shri Navaratnam)