BUZZ-Petrobras: Brazilian polls show potential tie
** Brazilian oil company's U.S.-listed shares up 1.5 pct at $17.78
** Company involved in corruption scandal under focus in presidential debate
** Brazilian regulators said Tuesday they were confident new ANP Regulation 25 will trump 2010 oil law provisions
** Rules don't prohibit Brazil from giving operator rights to some existing fields to Petrobras
** Nearly 20 million shares changed hands by 12.51 a.m. ET, making them most traded on the New York Stock Exchange
** Petrobras shares rose 6.6 pct on the Sao Paolo Stock Exchange in afternoon trading on Tuesday on news of tie between presidential candidates
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