Aspects of this topic are discussed in the following places at Britannica.
...A Japanese consortium operates an offshore rig at Al-Mubarraz, and other offshore concessions are held by American companies. Onshore oil concessions are held by another ADNOC company, the Abu Dhabi Company for Onshore Oil Operations, which is likewise partially owned by American, French, Japanese, and British interests. Other concessions also are held by Japanese companies.
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