SINGAPORE -

* Qatar Petroleum has set the April official selling price (OSP) for its Marine crude at 90 cents a barrel above the average of Platts Oman and Dubai quotes, up 25 cents from the previous month, a pricing document showed on Thursday

* The April OSP for Qatar Land crude was set at 75 cents a barrel above the Platts Oman/Dubai average, up 40 cents from the previous month, the document showed

(Reporting by Shu Zhang; Editing by Jacqueline Wong) ((shu.zhang@thomsonreuters.com; +65-6870-3549; Reuters Messaging: Twitter @shuzhang4))