(EnergyAsia, December 4 2013, Wednesday) — ExxonMobil has reduced its original 60% shareholding in the development of a block of Iraq’s giant West Qurna oilfield to 25% after concluding sales to two state-owned firms of China and Indonesia. PetroChina said it has bought a 25% stake in the West Qurna-1 oilfield project from Exxon Mobil,…