UPDATE 1-PetroChina reviews multi-billion-dollar push to produce LNG used in transport -sources
(Adds details on China's natural gas price reforms) By Chen Aizhu BEIJING, Aug 18 (Reuters) - China's biggest energy firm PetroChina is reviewing its multi-billion-dollar push to produce liquefied natural gas (LNG) to fuel trucks and ships in place of diesel, shutting two major gas l
