SAO PAULO, Jan 3 (Reuters) - Brazil's state-controlled oil company Petroleo Brasileiro SA and Repsol Sinopec, a joint Spanish-Chinese venture in the country, are handing back exploration rights at the Piracucá field in the Santos basin due to lack of commercial viability, the companies said.
Brazil's oil regulator, ANP, said the companies had given up the concession to explore the oil and gas field, which was awarded by the government in 2000, according to a statement in Brazil's Official Gazette.
Piracucá was declared commercial in 2009 but further studies showed the area was not commercially viable, Petrobras, as the Brazilian state-controlled oil company is commonly known, said in a statement sent to Reuters.
It did not elaborate on any possible financial charges related to the decision.
Repsol Sinopec told Reuters in a statement that it has booked a charge but did not elaborate on its value. (Reporting by Luciano Costa; Writing by Tatiana Bautzer; Editing by Daniel Flynn and Paul Simao)