OPEC has been celebrating this year with soaring oil prices, but shale oil is a

This year, oil prices have risen to their highest levels since May 2015 and may appear to be a reason for the OPEC's delight, but some members are worried that such increases may also push shale oil companies to open their supply gates and re-market the market again crude.

 
Indicator Brent crude rose further above $ 68 a barrel on Tuesday as gains have been limited to major oil-producing countries such as the Organization of Petroleum Exporting Countries (OPEC) and Russia, which is scheduled to be implemented by the end of 2018.

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Soaring oil prices have greatly boosted oil-producing countries' incomes and many countries have not recovered from the plunge in oil prices since mid-2014 when oil prices plunged significantly from over $ 100 a barrel due to oversupply.

However, some OPEC countries are worried about the rising oil prices, which may stimulate the increase of shale oil production in the United States and cause more surplus supply, dragging oil prices and taking away OPEC's market share.