The global hunt for new sources of oil will slow by around US$3 billion ($4.2b) this year even as oil prices climb to fresh highs not seen in over two years.
The oil price is now more than two and a half times higher than the historic lows endured by oil companies two years ago, but they are still keeping a lid on risky oil exploration even as prices climb to US$68 a barrel.
Oil prices have rallied in recent days in line with growing fears that political unrest in Iran, the third largest oil producer with the Organisation of Petroleum Exporting Countries (Opec), could lead to supply disruptions.
Andrew Latham, a researcher with Wood MacKenzie, said most companies are likely to remain "highly cautious" about investing in exploring for fresh oil reserves.
"Global investment in conventional exploration and appraisal will be around US$37 billion in 2018. This will be 7 per cent less than 2017's spend of US$40 billion, and more than 60 per cent below its 2014 peak," he said.