Negotiations between major US oil companies and the Venezuelan government have reached an impasse over access to some of the country's most productive oil assets, slowing Washington's efforts to boost crude output from the sanctions-hit South American nation, according to a report by The Wall Street Journal .
Talks involving companies such as ExxonMobil and Chevron have stalled over fiscal guarantees and access to the most attractive oil fields, with disagreements persisting between the companies and Venezuela's state-run oil company, Petróleos de Venezuela SA (PdVSA), the report said.
