The rebalancing of the global oil market may still be in its early stage with the outlook “only getting murkier”, according to the International Energy Agency, as uncertainties remain about demand and supply responses to the steep drop in prices.

OPEC's strategy of holding output steady is not working and the group's members should discuss production levels before its next meeting in June, Iran's oil minister said, a sign of the pain lower prices are causing OPEC's less wealthy producers.

OPEC members (predominately Saudi Arabia) have traditionally been the only countries with the ability to ramp-up production through spare oil supply capacity. Nowadays, however, following the shale revolution, the US onshore market is widely being touted as the industry’s new ‘swing’ producer.

Iraq boosted crude shipments in March to the highest level in more than three decades, adding to a global supply glut that has helped push down oil prices by 46% in the last year.

Based on crude oil market assessments in the Short-Term Energy Outlook, EIA estimates that members of the Organization of the Petroleum Exporting Countries (OPEC), excluding Iran, will earn about $700 billion in revenue from net oil exports in 2014, a 14% decrease from 2013 earnings and the lowest earnings for the group since 2010.

With Saudi Arabia reluctant to cut production, crude oil prices over the next decade depend greatly on producers’ costs, says a veteran observer of oil markets and the Middle East.

OPEC and lower global oil prices delivered a one-two punch to the drillers in North Dakota and Texas who brought the U.S. one of the biggest booms in the history of the global oil industry.

China’s Sinopec has become the latest oil major to cut its capital expenditure, after the slide in crude prices knocked nearly one-third from its 2014 profit.

Steady climb in global demand growth prompts slight upward revision of 2015 forecast.

Capital spending budgets are being cut back, drilling rigs idled and staff laid off. The remarkable growth of US oil production, which brought more than 1m barrels per day of additional supply on to world markets in each of the past three years, seems likely to flatten out this year.