Abu Dhabi’s two key offshore operating companies are to merge in 2018 in the latest development in the shake-up of the emirate’s oil and gas sector.

Abu Dhabi state oil firm Adnoc will integrate the Abu Dhabi Marine Operating Company (Adma-Opco) and the Zakum Development Company (Zadco) in early 2018, Adnoc CEO and Director General Sultan al-Jabir announced on 4 October.

The two companies have around 97% of Abu Dhabi’s 1.3mn b/d offshore production capacity. With...