China's "Big Three" oil majors have each expressed firm interest in participating in Brazil's upcoming tender for the giant presalt Libra field, according to a senior official from Brazil's National Petroleum Agency (ANP). Libra reserves could total as much as 12 billion barrels of oil equivalent but Brazil's demand for a record 15 billion real ($6.5 billion) signature bonus has deterred many international oil companies from the competition.
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