PetroChina Said to Study $10 Billion Russia Gas Investment

PetroChina Co. is seeking to invest in Russian gas fields as part of efforts by the two countries to conclude gas-supply negotiations that have dragged on for almost a decade, four people with knowledge of the matter said.

PetroChina, the publicly traded unit of state-owned China National Petroleum Corp., is interested in spending at least $10 billion for a minority share of eastern Siberian gas fields operated by OAO Gazprom and OAO Rosneft, said three of the people, who asked not to be named as deliberations are private.