Chevron: Tengiz Expansion may add 12 Million Tons of Oil a Year

    By Jacob Gronholt-Pedersen     A planned expansion of the Tengiz oil field in Kazakhstan would add 12 million metric tons of crude production a year by 2016, Chevron Corp. (CVX) Vice President Ian MacDonald said Thursday.     The decision whether to expand the Tengiz field may be taken in 2011, MacDonald said at a...