Opec raised its forecast of oil supplies from non-member countries in 2017 as new fields come online and US shale drillers prove more resilient than expected to cheap crude, pointing to a larger surplus in the market next year.

Demand for crude from the Organization of the Petroleum Exporting Countries will average 32.48 million barrels per day (bpd) in 2017, Opec said in a monthly report on Monday. That is down from the previous forecast of 33.01 million bpd.

Opec itself kept output near a multi-year high in August, pumping 33.24 million bpd, according to figures Opec collects from secondary sources, down 23,000 bpd from July's figure, the report said. – Reuters