(Recasts, adds details on explosion, PDVSA response) CARACAS, Venezuela, Dec 7 (Reuters) - Venezuelan state oil company PDVSA has contained a fire the day after an explosion rocked a natural gas pipeline in the west of the country, the company said on Thursday. PDVSA did not say what caused the explosion on Wednesday but said it was "almost impossible" anyone had been injured. The company did not respond to requests for further details. The pipeline runs through an area operated by oil company Petrocumarebo, but a source at that company said the explosion took place miles away from any of the company's facilities. State news agency ABN initially reported the fire occurred in the installations of Petrocumarebo, a joint venture between PDVSA and a subsidiary of Canadian energy company Petrofalcon <PFC.TO>. A witness told Reuters by telephone that the fire broke out after a massive explosion that was heard from more than 10 miles (16 km) away. PDVSA and the energy ministry have designated a commission to study the causes of the incident.
