began at the Atrush field in mid-April. The field’s partners are testing heavy oil from the Atrush-3 well, and plan to dilute it with volumes from the nearby Chiya Khere-10 well. The heavy oil facilities can handle 5,000 b/d, implying that total capacity has increased to 35,000 b/d.

Atrush is undergoing a shareholder revamp, with Marathon selling its 15% stake to partners Shamaran and UAE’s Taqa. Shamaran says it expects the deal to close shortly, following which the partners...