By Will Connors 

Rio de Janeiro--International oil companies operating in Brazil are cautiously optimistic that no matter who wins this Sunday's presidential election, the new administration will take steps to restart investments in the nation's once-booming oil sector.

Falling petroleum prices, a weak economy and slumping profits at state-owned Petroleo Brasileiro SA have increased the urgency for the government to woo foreign capital back to help develop the nation's massive reserves, analysts said.

President Dilma Rousseff has promised to simplify taxes for outside investors and hold more frequent lease auctions, if elected. Her challenger Aécio Neves, who is trailing the incumbent in most polls, says he will consider make production-sharing agreements more favorable to foreigners.

"I think there is a realization on both sides that changes need to be made if the potential of Brazil's upstream [oil] sector is to be fully realized," said Ruaraidh Montgomery, an analyst at oil consulting firm Wood Mackenzie.

Just a few years ago Brazil's oil industry was among the world's most promising.

In 2007 Petrobras discovered massive deep-water oil reserves off the Atlantic coast, and the government announced a more than $200-billion spending plan that would make Brazil one of the world's top five oil producers. Investors including George Soros bought up shares in the company. Foreign companies not already active in Brazil rushed to set up offices here and bid for access to the new fields.

But Ms. Rousseff's government made a number of changes to the oil industry in an attempt to give Petrobras home-field advantage and harness newfound oil revenue for social programs. A new law required Petrobras to hold at least a 30% stake and be the sole operator of some of the most sought-after oil fields. Foreign companies were required to use more local materials and companies for projects, which drove up costs. Oil field auctions became less predictable.

Those changes soured foreign companies and investors, who soon spotted new, more lucrative opportunities elsewhere as the U.S. shale boom gathered steam and Mexico signaled it would open its oil sector. Several smaller oil companies left Brazil, while bigger companies paused or slowed down their investment plans.

Meanwhile, Petrobras has faced its own headwinds. In a bid to curb inflation, the government forced the company to sell fuel at a loss to Brazilian consumers, hurting its profitability. The oil giant has also been rocked by corruption scandals allegedly involving Brazil's main political parties. Petrobras shares have fallen more than 80% from their May 2008 peak. Moody's this week downgraded the company's debt to Baa 2 from Baa 1.

"Brazil is falling off the world oil map," Milton Costa Filho, the executive secretary of the Brazilian oil, gas and biofuels institute, an industry advocacy body, said at a conference here last month. "Investors have other options now."

In debates and in stump speeches, both presidential candidates have sought to assure oil companies that things would be better going forward.

Ms. Rousseff's government recently announced that bidding rounds for oil fields will happen more often, starting with an auction in early 2015. The previous auction, held last year, the first in five years, attracted just one bid. And officials in her ruling Workers' Party have said they would look to simplify the country's complex tax laws.

That is welcome news to Pal Eitrheim, the Brazil country director for Norway's Statoil, which has a majority stake in one producing oil field and holds seven exploration licenses in Brazil.

"Countries that can offer predictable competitive terms will attract international investment," he said. "That's a challenge Brazil needs to be dealing with going forward."

Still, investors had been pinning their hopes on a change in administration. The candidates had been locked in a technical tie down the stretch, but two polls on Thursday showed Ms. Rousseff opening a lead over Mr. Neves. Petrobras shares fell 5.6%.

Mr. Neves, of the conservative Brazilian Social Democracy Party, has promised to end government fuel subsidies that have siphoned profits from Petrobras. And he told The Wall Street Journal in a recent interview that he would consider loosening production-sharing rules implemented under Ms. Rousseff that have curbed foreign investment. Currently outsiders must grant Petrobras at least a 30% stake in all projects in Brazil's so-called pre-salt offshore fields.

"I want to discuss the pre-salt exploration model, respecting the current contracts," Mr. Neves said.

Despite the barriers to doing business in Brazil, the nation's vast offshore deposits remain attractive to major oil companies. Brazil has 13.2 billion barrels of proven oil reserves, 16th in the world, according to the U.S. Energy Information Administration, though some industry officials think the number could be much higher.

"Companies always look at options around the world, and there are options," said Guillermo Quintero, BP's regional president for Brazil, Uruguay, Venezuela and Colombia. "But that doesn't mean BP is discarding Brazil, at all. The money will go where the best opportunities are."

Luciana Magalhaes contributed to this article.

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