The Galkynyş Gas Field, formerly known as Ýolöten gas field or South Ýolöten – Osman field, is a large natural gas field near Ýolöten, Mary Province, Turkmenistan. It is the world's second-largest gas field.

History The discovery of the gas field was announced on 2 November 2006. Late Turkmen president Saparmyrat Nyýazow invited Chinese CNPC and Turkish Çalik Enerji to participate in the exploration and development of the Ýolöten field. In 2008, the gas field was audited by Gaffney, Cline & Associates (GCA). According to GCA, Galkynyş is five times larger than the Döwletabat gas field and the fourth- or fifth-largest gas field in the world.

In December 2009, the contracts to develop the field were awarded to CNPC, Hyundai Engineering and Petrofac.

In November 2011, the field was renamed as Galkynyş. Production started in September 2013.

Description The gas field ranks among the world's five largest with estimated reserves of between of natural gas and proven commercial reserves of . It lies on zone of in length and in width at a depth of . Galkynyş consists of Ýolöten, Minara, Osman and Ýaşlar fields. Other nearby gas areas are Günorta Garaköl, Garaköl, Jürji, Gazanly, Gündogar Ýolöten and Günbatar Ýandakly.

Oil reserves are 300 million tons. The crude oil extracted at Galkynyş is transported to the Seýdi Oil Refinery.

Development The field is developed by Türkmengaz. CNPC, Hyundai Engineering and Petrofac built gas processing plants.

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