The Organization of the Petroleum Exporting Countries (OPEC) said on Monday that global oil demand is expected to zoom 23 percent by 2045 even as the global economy doubles in size.
Brent crude futures rose 95 cents, or 1.3%, to $74.80 a barrel by 2300 GMT on Sunday. U.S. West Texas Intermediate (WTI) crude was at $70.04 a barrel, up 88 cents, or 1.3%.
Following the Saudi output cuts, US crude oil prices rose 2.4 percent to $73.47 per barrel and the Brent crude futures advanced 3 percent to $79 per barrel.
China's foreign exchange reserves have been rising steadily since 1997, from 15 percent of the gross domestic product around that time to more than 40 percent currently.