The Middle East crude market firmed up, with April differentials strengthening on swift cargo trade and thinning supplies. The Abu Dhabi benchmark grade, Murban, was pegged at a slight premium of 0-5 cents a barrel to the Adnoc official selling price. April Oman traded on the DME was at a premium of $3.31 to Dubai swap quotes at 0830 GMT, using the settlement price for DME futures, the ICE one-minute marker for Singapore and the Brent-Dubai EFS as calculated by Reuters. Front-month Brent/Dubai Exchange of Futures for Swaps (EFS) for April rose 56 cents from the previous session to $4.35 a barrel. An Iranian supertanker loaded with crude has made a rare journey to an anchorage point off the coast of an Indonesian island used for offshore sales and storage of oil. Myanmar will launch a global tender for six onshore oil and gas blocks as the reforming Southeast Asian country seeks to tap more foreign investment from the West, two Yangon-based sources with direct knowledge of the deals said. Saudi Arabia’s concern is to keep the global oil market well supplied, its deputy oil minister said on Thursday.