By Jeff Fick 

RIO DE JANEIRO--The group of oil companies exploring Brazil's largest offshore discovery will spend between $400 million and $500 million on the field in 2014, consortium leader Petroleo Brasileiro SA, or Petrobras, said late Thursday.

Petrobras heads the group of companies that will develop Libra, a field that is estimated to hold between 8 billion and 12 billion barrels of recoverable oil buried beneath a thick layer of salt under the Atlantic Ocean seabed. The consortium, which paid about $7 billion for rights to the field at an auction last October, also includes France's Total SA, Royal Dutch Shell, Cnooc Ltd. and China National Petroleum Corp.

The group will reprocess seismic data of the area containing the field, drill two wells and evaluate whether to hire a firm to do a new seismic survey of the area, Petrobras said. Drilling will start in the second half of 2014 and is expected to be concluded by mid-2015, the company added.

A well test is also planned for the end of 2016.

The companies have four years to carry out the exploration program, Petrobras said. Development of the field is expected to cost $174 billion over the 35-year life of the concession contract.

Libra is part of a series of large crude-oil deposits discovered off Brazil's southeast coast. Brazil's government wants to use development of the fields to spark a homegrown services industry supporting the oil and natural gas sector. Royalties, meanwhile, will be earmarked for funds that will invest in education, health care and social welfare projects.

Brazil's government expects the field to generate more than $400 billion in revenues from royalties and taxes over the next 35 years.

Write to Jeff Fick at jeff.fick@wsj.com

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