Tengizchevroil raise Oil Output in 2010

    Tengizchevroil, a Chevron-led Kazakh upstream venture, will raise oil output to 23.5 million tons this year from 22.5 million in 2009, it said on Wednesday.     "We don't discuss forecasts any further than that, but we are working to continue to expand production from our existing facilities as well as on opportunities...