OREANDA-NEWS. National Company KazMunaiGas JSC (Astana), whose bonds are officially listed on Kazakhstan Stock Exchange (KASE), has by an official letter informed KASE of "signing an Addendum No. 7 to the Agreement No. 2546 dated December 29, 2007 for exploration and production of hydrocarbons on the site "H" located in Kazakhstan part of the Caspian Sea (state registration number No.4122-УВС-МЭ of March 13, 2015)."