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in 1979, has recoverable reserves estimated at between six billion and nine billion barrels. The field was jointly developed in 1993 as a 40-year venture of Chevron Texaco (50%), KazMunayGas (20%), US ExxonMobil (25%) and LukArco (5%). The joint venture company is known as Tengizchevroil (TCO). Chevron is the operator of the TCO field.The Tengiz oil fields entered

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