Diamondback Energy Inc. epitomizes the problem shale poses for traditional oil majors and oil-reliant economies such as many of OPEC's members.The E&P company reported results late Tuesday that blew away earnings expectations, marking the eighth such quarter in a row, according to figures compiled by Bloomberg. Diamondback's stock duly popped by as much as 4.5 percent on Wednesday morning, staying in the green even after another weak set of inventory data from the Energy Information Administration pushed down oil prices. Indeed, remarkably, Diamondback's stock has held pretty steady this year as oil prices have dropped, taking down E&P stocks and even weighing on the relative darlings of the sector, its fellow Permian-shale-focused companies:

Diamondback is a practiced user of the force that really propels the shale boom: U.S. capital markets. It has raised about $4.1 billion from a series of stock sales, the most recent one in December. Its share count is now 2.7 times what it was at the end of 2012. That's a lot of dilution to absorb unless you see results.Fortunately for Diamondback, it is delivering what E&P investors want; namely, growth and efficiency gains.Production in the first quarter was up 61 percent from a year earlier, to 62,000 barrels of oil equivalent per day. Three quarters of that was higher-value crude oil versus natural gas and natural-gas liquids. On a trailing four-quarter basis, Diamondback's average production of 49,000 barrels a day was up 150 percent since 2014. Importantly, production per share, despite the rapid increase in the share count, is 43 percent higher over the same time frame. Meanwhile, Diamondback's unit costs keep dropping.

OPEC's efforts to juice prices have helped, too, of course. Diamondback's realized price of almost $42 per barrel of oil equivalent in the first quarter was up almost $17 versus the same period in 2016, when oil prices crashed below $30. However, Diamondback's cash margin was up even more, by almost $19 a barrel. And its guidance, reaffirmed with the results, suggests further gains to come. While production and transportation costs in the first quarter were already at the low end of the company's guidance range for the year, both G&A and interest costs, $2.48 and $2.21 per barrel of oil equivalent, respectively, were above or toward the top end of their ranges. at the mid-point of Diamondback's guidance, and assuming the same production mix as the past 12 months, it should earn a cash margin per barrel of almost $30 this year, up almost 50 percent from 2016. That assumes an average realized oil price of $50, $3 for natural gas and $20 for natural-gas liquids. And, of course, this higher margin would be earned on 69 percent more barrels, at the mid-point of guidance, implying a cash margin of $780 million, not far short of expected capital expenditure of $900 million. Diamondback's credit facility, just raised by $250 million, is more than enough to cover that, even allowing for some cash taxes in the mix. The company's nearest bond maturity isn't until 2024.In other words, Diamondback is coming close to self-funding very high double-digit growth at $50 oil, meaning it could slow the pace of stock sales. This very fact, though, means it probably will keep acquiring more acreage, coming back to the market to fund that -- and finding the market quite willing to do so.