SINGAPORE  -

* Qatar Petroleum (QP) has sold four cargoes of December-loading al-Shaheen crude at an average premium of $3.1 a barrel to Dubai quotes via a spot tender, the highest since at least 2013, two trade sources said on Thursday

* The 500,000-barrel cargoes were offered to load over Dec. 1-2, 19-20, 28-29 and 29-30

* The buyers are not immediately known

* QP also set the price for term buyers at a premium of $3.26 a barrel to Dubai quotes, they said

* Prior to the tender, several cargoes of al-Shaheen crude were sold at premiums of around $3.1 a barrel to Dubai quotes to Japanese and Indian buyers in spot trades, traders had said on Wednesday.

(Reporting By Shu Zhang; editing by Uttaresh.V) ((shu.zhang@thomsonreuters.com; +65-6870-3549; Reuters Messaging: shu.zhang.thomsonreuters.com@reuters.net; Twitter @shuzhang4))