Adds details, context from paragraph 2 onwards

By Tibisay Romero

MORON, Venezuela, June 25 (Reuters) - Venezuela's Moron Petrochemical Complex, the country's second largest in operation, was restarting on Thursday after a preventive shutdown due to quakes that caused infrastructure damage, the local chief of firefighters said.

The quakes, which killed more than 160 people, left Venezuela's vast oil and gas infrastructure mostly untouched, including the 146,000-barrel-per-day El Palito refinery in central Carabobo state near the epicenter, according to preliminary reports from workers. But assessments are expected to continue this week as repairs are done, they added.

Carlos Miquileno, head of firefighters for Moron and Urama, also said that a key power plant in the central region, Planta Centro, was expected to restore supply starting on Thursday.

Workers from the Moron complex had been told not to come in while an initial assessment on damages was conducted, sources from that center had said earlier, adding that a leak from a storage tank had been detected on Wednesday.

It was not immediately clear if the leak was repaired. State petrochemical company Pequiven and PDVSA have not provided information about the status of its operations. Venezuela's oil ministry did not immediately reply to a request for comment.