For many years, markets had focused on ‘peak oil’, whereby escalating costs of production as new oil deposits became harder to source and rising levels of depletion meant that an increasing amount of production would be needed each year to keep overall supply unchanged.
In the International Energy Agency’s (IEA) 2008 World Energy Outlook, it published for the first time a study of depletion rates in the top 800 global oil fields. It concluded that depletion rates had risen to 5.1% p.a. from 4.5% a few years previously and forecast that this would continue to rise over the coming decades.
This meant that the global oil market balance would naturally tighten every year by 4-5m b/d (million barrels per day) and the IEA report concluded that, “it is becoming increasingly apparent that the era of cheap oil is over”.
However, in the background, a technology, which was initially discovered in the mid 19th century, was already gaining traction: hydraulic fracturing. The US shale oil revolution crept up on markets in the following years and then rapidly accelerated from 1.2m b/d in 2010 to a peak of 5.36m b/d in March 2015.