A Brazilian court...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...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...Neither Chevron nor any of its executives "have been formally notified of any action by the judiciary yet," the company statement said. "Any legal decision will be abided by the company and its employees. We will defend the company and its employees."...Navy staff found the stain...after flying over the area off Brazil's Atlantic coast...