In a report titled: 'Hooked On Hydrocarbons: How Susceptible Are Gulf Sovereigns To Concentration Risk?, it said their high concentration on this sector, in which prices and volumes are highly cyclical, is a credit risk.
The significant oil and gas reserves and the high income that the oil and gas sector generates results in general government surpluses, low government financing needs, and net external asset positions for most Gulf Cooperation Council (GCC) countries - Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the UAE.
"A sharp and sustained fall in the oil price or in hydrocarbon export volumes would significantly dent their economic and financial indicators."
On average, hydrocarbon revenues constitute 46 percent of nominal GDP and three-quarters of total exports of the six GCC countries.
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Furthermore, this strong dependence on hydrocarbon revenues appears to be increasing, it said.
"Nevertheless, some GCC countries appear more vulnerable than others to a drop in oil prices, according to Standard & Poor's analysis of certain economic, external, and fiscal risk indicators.
"We assess Bahrain and Oman as highly vulnerable to a fall in hydrocarbon prices or production. They have the highest fiscal break-even oil prices among GCC states.
Based on 2013 data, for Bahrain the oil price needs to be USD 18 higher than the current oil price for the sovereign to achieve a balanced budget, the report said.