Call it a crude conundrum: global oil production is surging, demand is falling and prices are dropping fast. Brent Crude fell under $100 a barrel this week and hit a 17-month low on Thursday, and West Texas Intermediate was trading close to $90 a barrel. All of which has some traders asking when—or if—producers will cut output in order to buttress prices.

An oil drilling rig operated by Petroleos Mexicans (Pemex) off the coast of Ciudad del Carmen, Mexico.

While crude demand typically drops in the fourth quarter, traders are increasingly concerned about longer-term global growth and its overall effect on crude demand. Specifically, problems in the euro zone and signs that China is importing less crude are making the market anxious.