The German giant blamed the lack of a grant of access to local infrastructure for its decision to pull up sticks and quit the major Middle Eastern gas-producing state.

Wintershall is shutting its office in the capital Doha and returning its 80% operated stake in Block 4 North, where it is partnered by state player Japan's Mitsui on 20%.

The partners made the Al Radeef gas discovery on the Khuff field in the block in 2011 after four years of intensive exploration.

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