The study by the Carbon Tracker Initiative highlighted 20 of the biggest projects around the world that need a minimum oil price of US$95 per barrel to be economically viable.
Most on the list require prices well north of US$110 per barrel and a few in the oilsands even need prices higher than US$150.
Oilsands players flagged as having some of the most economically risky projects include global majors such as ConocoPhillips, Royal Dutch Shell and ExxonMobil.
Other pricey projects highlighted in the report were in deepwater or ultra deepwater off West Africa and Brazil, as well as in the Arctic.
In total, the 20 projects represent close to $91 billion in capital spending over the next decade; the report's authors say the money would be better spent returning cash to shareholders than invested in risky projects.