Demand worriesNegative_sentimentflipped the oil market into a contango last week , a market structure where prices for near-term contracts are lower than those for later contracts , indicating ample suppliesOversupply.
`` Fear of global economic growth slowingSlow.weak-LRB- is -RRB- afflicting the entire energy complex with worriesNegative_sentimentthat demand growth will be bearishSlow.weakthis year , '' Peter Kiernan , lead energy analyst at the Economist Intelligence Unit -LRB- EIU -RRB- , said .