Chevron is Kazakhstan's largest private oil producer, holding important stakes in the nation's two biggest oil-producing projects—the Tengiz and Karachaganak fields.

Tengiz is the world's deepest operating super-giant oil field, with the top of the reservoir at about 12,000 feet deep (3,657 m). Chevron holds a 50 percent interest in Tengizchevroil (TCO), which operates the field. The partnership also is developing the nearby Korolev Field.

TCO completed a $7.4 billion expansion, referred to as the Sour Gas Injection and Second Generation Plant, in 2008. The integrated expansion projects increased TCO's crude oil production capacity by approximately 80 percent.