SAO PAULO/RIO DE JANEIRO, March 17 (Reuters) - A Brazilian court on Saturday barred 17 executives from Chevron and Transocean from leaving Brazil, pending criminal charges related to a high-profile oil spill last November.

A federal judge in Rio de Janeiro state granted a request from prosecutors who are pressing for charges against both firms, a spokesman for prosecutor Eduardo Oliveira said in a phone interview. George Buck, who heads Chevron's Brazil unit, and the other 16 executives must turn in their passports to the police within 24 hours, the spokesman said.

Charges are expected to be filed on Tuesday or Wednesday, according to the prosecutors' press office.