Companies in the six Gulf Arab states are under pressure as governments reduce spending in response to a slump in oil revenues, Standard and Poor's ratings services said on Monday.

"Corporate and infrastructure companies in the (Gulf Cooperation Council) GCC face a weaker operating environment at present on the back of lower oil prices," S&P said in a report.

Low oil income has slowed government expenditures on which these companies largely depend, it said.

World oil prices have dropped by more than 50 percent since June 2014.

The International Monetary Fund forecasts that that will result in a $300 billion drop in revenues this year for the six GCC states -- Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates.

Some infrastructure projects have been scrapped as a result, S&P said.

"We observe, however, that GCC governments continue to invest in large public sector infrastructure projects," said S&P credit analyst Karim Nassif.

"Still, the longer the oil price remains near current low levels, the higher the likelihood of seeing more infrastructure projects postponed or dropped," he said.

S&P said the Dubai real estate market is also suffering with residential prices projected to fall by between 10 percent and 20 percent this year.

But it said it expected UAE property firms to withstand the correction.