By Asa Fitch 

Lower oil prices are threatening to curtail the spending that energy-rich Persian Gulf governments have used to shore up support since the Arab Spring.

A continuing decline in prices could curb foreign-asset purchases by the governments of Bahrain, Oman, Saudi Arabia, United Arab Emirates, Qatar and Kuwait and put a drag on the post-Arab-Spring construction growth that has benefited multinational contractors.

Such a reconsideration could have implications for global asset markets, for regional politics and for the pace of a development boom into which governments have pumped hundreds of billions of dollars and from which many foreign companies have profited.

Leaders in the Gulf have begun talking more openly about spending adjustments and economic diversification away from energy.

Oman's minister of oil and gas, Mohammed al Rumhi, said this month that the price decline is "a challenge, because the country depends on oil," according to the Muscat Daily. "Oil prices going down will affect the state budget," he said.

High oil prices have helped Gulf governments in their attempt to head off the kind of unrest that toppled regimes in Tunisia and Egypt in 2011. To keep their citizens content, the royal-family hegemonies used their energy-fueled fiscal muscle to start building schools, hospitals, housing for citizens, roads and other social projects.

Government spending by the Middle East's oil exporters jumped above $700 billion in 2011 and grew by about 15% annually until this year, when estimates show the rate of increase slowing, according to the Institute of International Finance

"If revenues are not forthcoming, something has to give," said John Sfakianakis, the Middle East regional director for Ashmore, a U.K.-based emerging-market asset manager. "Eventually some of these huge projects will have to slow down."

If oil prices, which have dropped to below $80 a barrel from more than $100 a barrel in July, continue to stay low, this slowdown could persist.

The scale of the coming budget problem is biggest in Saudi Arabia, the Gulf's leading economy. Saudi Arabia spent $265 billion last year, according to International Monetary Fund estimates. If it doesn't alter fiscal policy, it is on pace to run a budget deficit amounting to 1.4% of economic output next year, despite its enormous wealth.

Saudi Arabia needs oil to trade at about $97.50 a barrel this year to sustain its spending without running a deficit or tapping reserves, according to the IMF.

Oil prices fell below Saudi's break-even budget level in July and have remained below it since. The break-even levels for the Gulf countries apart from Qatar and Kuwait are already above current oil prices.

Light, sweet crude futures settled at $76.51 in New York on Friday. Brent crude, the leading European oil benchmark, traded at an average of around $110 a barrel between 2011 and 2013.

Spending also has ballooned in the U.A.E., where Abu Dhabi pledged last year to build $90 billion of projects through 2017--many of them with the help of foreign companies. Bahrain, Qatar, Oman and to a lesser extent Kuwait have been on spending sprees, too.

The Gulf's big energy exporters, including Saudi Arabia, Kuwait, the U.A.E. and Qatar, could try to fight the decline in oil prices.

As some of the most influential members of the Organization of the Petroleum Exporting Countries, the cartel of big oil producers, they could agree to cut output in a bid to buoy prices.

But the group has so far failed to reach any consensus about reining in production, and it is unclear how much impact OPEC would have on prices if it did act.

The countries also could issue debt or tap into government savings if current oil receipts can't pay for planned expenditures, tiding them over while they make budget adjustments.

In the U.A.E., for example, there was "no need now to adjust very quickly to lower revenues" because of the existence of the Abu Dhabi Investment Authority and other sovereign asset pools, said Harald Finger, the head of the IMF's mission to the country.

Still, Gulf countries are reluctant to drain sovereign-wealth funds, together estimated at more than $1 trillion, leaving spending cuts as the only other option outside of borrowing.

Such cuts, however, could endanger spending that has been a boon to foreign companies and investors. U.S. construction company Bechtel Group Inc. and Germany's Siemens AG won contracts to help build a $23.5 billion metro in Riyadh last year, while Royal Dutch Shell PLC signed a deal in 2012 with Qatar Petroleum to build a huge new petrochemicals complex in Qatar.

If Gulf countries do decide to dip into sovereign funds, it could force a pullback by some of the world's most active institutional investors.

Gulf funds have spent billions of dollars in recent years on everything from London real estate to Australian and U.S. infrastructure, and have served as key financial backstops for large Western banks in the throes of the financial crisis. Funds in Abu Dhabi and Qatar helped rescue Citigroup Inc. and Barclays PLC in 2007 and 2008.

In an era of greater austerity, funds may still make new investments using dividends and investment gains, but the flow of Gulf money into international markets could be slower.

The shift toward domestic spending has already prompted changes in sovereign-fund allocations in Qatar, where more new energy revenues have been flowing directly to the government, bypassing the Qatar Investment Authority, its main sovereign-wealth fund. The QIA "has been changing its strategy, becoming less illiquid and Europe-centric on the international side and more engaged in the local economy," said Victoria Barbary, the director of Institutional Investor's Sovereign Wealth Center, a London-based research group.

The IMF, meanwhile, recently reiterated calls to rein in spending. Christine Lagarde, the IMF's managing director, in October said Gulf countries needed to balance budgets more urgently given the oil-price decline.

The financial realities faced by oil-rich Gulf countries and the investors and companies that have grown used to high prices are stark.

"I think the Gulf economies will have to project fiscal discipline," Mr. Sfakianakis, the Ashmore director, said. "They don't want to be seen as profligate."

Write to Asa Fitch at asa.fitch@wsj.com

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