Kashagan field is considered the world’s largest discovery in the last 40 years, as well as the largest offshore oil field. Kashagan field represents a single hydrocarbon reservoir with oil and gas initially in place estimated at 6.4 billion tonnes (51 billion barrels) and covers an area of about 820 square km. Kashagan contains significant reserves of natural gas of more than 1 trillion cubic metres.
The field is located 80 km to the south-west of Atyrau, the reservoir lies below the shallow waters of the northern part of the Caspian Sea. The field was discovered in the year of 150th anniversary of 19th century Kazakh poet from Mangystau, Kashagan Kurzhimanuly, and named after him. Opened on June 30, 2000.