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(Bloomberg) Here’s Why This Is Only the Fourth Time Oil Has Tanked. For oil companies, the legacy of $100 crude is starting to run dry.

A wave of projects approved at the start of the decade, when oil traded near $100 a barrel, has bolstered output for many producers, keeping cash flowing even as prices plummeted. Now, that production boon is fading. In 2016, for the first time in years, drillers will add less oil from new fields than they lose to natural decline in old ones.

About 3 million barrels a day will come from new projects this year, compared with 3.3 million lost from established fields, according to Oslo-based Rystad Energy AS. By 2017, the decline will outstrip new output by 1.2 million barrels as investment cuts made during the oil rout start to take effect. That trend is expected to worsen.

“There will be some effect in 2018 and a very strong effect in 2020,” said Per Magnus Nysveen, Rystad’s head of analysis, adding that the market will re-balance this year. “Global demand and supply will balance very quickly because we’re seeing extended decline from producing fields.” A lot of the new production is from deepwater fields that oil majors chose not to abandon after making initial investments, Nysveen said in a phone interview.

Royal Dutch Shell Plc is scheduled to start the Stones project in the Gulf of Mexico’s deepest oil field this year after approving it in May 2013. Benchmark Brent crude averaged $103 a barrel that month compared with about $41 on Monday. Stones will add about 50,000 barrels a day to Gulf of Mexico output at a peak rate, according to Shell.Two other deepwater projects, run by Noble Energy Inc. and Freeport-McMoran Inc., are due to commence this year, the U.S. Energy Information Administration […]