Petrotahlil - Spanish energy major Repsol (REP.MC) lowered its oil price LCOc1 assumptions on Thursday, bringing its long-term outlook in line with most European rivals which have booked writedowns and leaving Equinor as a bullish outlier in the sector.
Repsol took a writedown of $1.5 billion in second-quarter results, after it had already booked 5.7 billion euros ($6.61 billion) in upstream asset impairments last year.
It had previously assumed oil prices might reach $87 a barrel in 2035, adjusting for inflation, but has now revised its headline figure to an average of $59.6 a barrel until 2050 in this year's prices.
Equinor (EQNR.OL) forecasts oil prices to jump to around $80 a barrel in 2030, in 2019 prices.
This month, Eni (ENI.MI) announced a 3.5 billion euro impairment on the value of its assets after revising down its long-term oil price outlook.
That came on the back of Royal Dutch Shell's (RDSa.L) $22 billion writedown last week and BP's (BP.L) $17.5 billion hit in June.
While break-even prices for new development projects typically lie below future oil price assumptions, these writedowns have raised questions about the risk of stranded assets - or resources that are left underground because they are uneconomical to tap - in the oil and gas sector.