Is the world sleep-walking into an oil crisis?
November 10, 2025
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8 min
For decades, the oil industry was defined by reinvestment. When prices were high, cash was recycled into new exploration, drilling, and supply. The last ten years broke the cycle. Over the past decade, large-cap oil and gas companies have generated extraordinary cash flows, yet much of that money was diverted into green-energy initiatives, and even more into shareholder distributions through dividends and buybacks.
At first glance, this seems like healthy discipline: avoiding the waste of past booms, rewarding shareholders, and spending cautiously on transition projects. However, if you follow the capital-allocation trail, history shows a different pattern. When oil companies divert capital away from upstream reinvestment, the result is the same: future supply crunches. Today, with shale rolling over and global decline rates rising, the warning signs are flashing again.
Diverted CapEx and historical parallels
The diversion of cash flows away from oil production is not new. One of the clearest examples came in 1979, when Exxon acquired Reliance Electric, a Midwestern manufacturer of motors and automation systems. As explored in Capital Allocation Almanac, Volume 2, “When Big Oil Tried to Go Electric”, the deal reflected a familiar late-cycle impulse: seeking growth outside the core business as the cycle peaks. Exxon paid more than $1 billion for Reliance, only to divest it less than a decade later at a fraction of the price. It remains a case study in how capital misallocation, not geology, often drives scarcity: every dollar spent diversifying away from energy is a dollar not invested in future supply.
The pattern repeated in the 2000s, when majors poured money into downstream refining, petrochemicals, and gas while conventional exploration lagged. When global demand accelerated mid-decade, supply could not keep up, culminating in the 2008 oil-price spike. After the 2014 crash, companies swung the other way, prioritizing dividends and buybacks over new long-cycle projects. That decision looked prudent when prices were low but left the system unprepared when demand rebounded.
History’s lesson is simple: when the majors allocate away from oil, they starve the system of future supply, and the next crisis follows.
Capital returns over reinvestment
Since COVID, the world’s top 20 oil and gas producers generated roughly $1 trillion in additional operating cash flow compared to the five years preceding the pandemic. Yet little of that new cash has gone toward expanding traditional oil supply.
Of that incremental $1 trillion, roughly 60% went to dividends, 25% to share buybacks, and the remaining 15% to other projects― mainly chemicals and renewables.
In other words, nearly four out of every five incremental dollars earned since COVID left the upstream system. For an industry defined by depletion, that marks a fundamental shift. The last time producers generated comparable cash flow― during the 2004–2008 cycle ― reinvestment surged. This time, it stagnated.
Saudi Aramco’s CEO Amin Nasser underscored the point, warning that the industry’s biggest mistake is “underinvesting in oil and gas supply during the energy-transition narrative.” He noted that global upstream spending, around $500 billion per year, remains $200 – 250 billion below what is needed to avoid a supply crunch later this decade. Even Aramco, the world’s lowest-cost operator, capped its sustainable capacity at 13 million barrels per day, focusing on maintaining that level through steady reinvestment rather than new greenfield expansion.
Upstream CapEx remains near pre-COVID levels in nominal terms and materially lower in real terms, even as free cash flow and shareholder distributions hit record highs. The industry is behaving as if shale’s flexibility will last forever.
The irony is that the same “capital discipline” investors reward today will be the source of tomorrow’s scarcity. Each dividend and buyback may look prudent in isolation but together represent a lost decade of reinvestment in an industry earning more than ever yet ill-prepared for what comes next.
Peak shale: the end of capital efficiency
For more than a decade, U.S. shale was the most productive investment story in the global energy market. Each dollar spent yielded barrels almost instantly. The infrastructure was already in place― pipelines, refineries, and service capacity built over generations. Unlike deepwater projects that required years of lead time, shale wells could be drilled and producing within months.
The short cycle responsiveness was the key to shale’s success. It was not just about geology, but capital efficiency. Shale allowed the industry to grow output without the multi-year investment cycles that defined earlier eras. It became the world’s swing supply, the shock absorber that balanced markets whenever prices moved.
But that era is ending. The best acreage in the Permian, Eagle Ford, and Bakken has been drilled. Productivity gains have flattened. “High-grading,” or drilling only the most productive zones, boosted short-term output, but accelerated long-term decline. The remaining rigs are moving into less prolific zones, where wells cost more, decline faster, and produce less.
As shale development spreads into new basins, the infrastructure advantage disappears. Each new field requires additional gathering, processing, and transport capacity. What made shale high-return was that the hard work had already been done; the next phase will not have that inheritance.
For years, shale’s short-cycle nature enabled companies to avoid big, long-cycle projects. They could return cash to shareholders while remaining confident shale could fill any gap. That cushion is now gone. Replacing shale barrels requires more capital, longer lead times, and higher break-even prices.
The world’s low-cost swing supply is losing its elasticity. History shows what happens when that transition collides with strong demand: volatility, scarcity, and the seeds of the next oil shock.
The decline rate problem: shale’s hidden cost
The defining strength of the shale revolution was speed. U.S. producers brought new supply online in months, not years. But that same speed came with a cost: decline. Each new shale well delivers rapid output followed by steep losses ― typically 60–70% in the first year, according to the U.S. Energy Information Administration (EIA).
As U.S. tight oil grew from near zero in 2008 to roughly 10% of global liquids supply today, those declines became embedded in the global production mix. The International Energy Agency (IEA) estimates the world’s observed decline rate has risen from 3.5 – 4% before the shale boom to 4.5 – 5% today. Short cycle barrels now make up a larger share of total supply, and they fade faster than conventional oil.
Conventional fields in OPEC and offshore basins once provided multi-decade stability, with decline rates below 3%. By contrast, today’s mix of short-lived shale wells and aging conventional assets requires constant drilling just to hold output flat. When capital slows, production declines almost immediately.
In short, the shale era traded longevity for flexibility. The world gained a supply source that could respond to prices quickly but lost the endurance that kept decline rates low. Now, with investment discipline limiting reinvestment, the global system faces a sharper decline curve than it has in decades.
Transition: when the math stops working
The numbers no longer add up. The world must replace four to five million barrels a day of natural decline each year, roughly the output of an entire OPEC member, to remain flat. Yet reinvestment in new long-cycle projects is at record lows. Shale, which once filled that gap, is now peaking. OPEC’s spare capacity is thin, and Russia’s production faces rising risks from infrastructure damage and sanctions. For the first time in decades, every major source of incremental supply is constrained at once.
As Amin Nasser put it, “Underinvestment, not peak demand, will be the dominant force shaping energy markets in the years ahead.” Aramco’s strategy reflects that reality: maintaining roughly $50 billion a year in upstream CapEx through 2028 to preserve 13 million barrels per day of sustainable capacity, not by building new megaprojects, but through continuous reinvestment in existing assets.
Capital discipline may look like prudence, but in an industry built on decline, it is the slow arithmetic of scarcity.
The capital allocation view
The capital-allocation choices of the past decade have created a fragile supply picture. Billions have been diverted into green projects that, while politically popular, do not meaningfully replace oil supply. Trillions have been returned to shareholders rather than reinvested in upstream capacity. The majors look disciplined today, but history shows this discipline eventually produces its own crisis.
The winners will be the few producers and countries still willing to invest countercyclically in oil supply before the next shortage hits. The warnings are clear: diverted CapEx, shale exhaustion, and accelerating decline all point to a structural undersupply risk. The next oil shock will not come from a demand boom, but from a decade of capital restraint.
Vaughan Nelson’s capital allocation framework and ‘Winners & Warnings’ series
There are few irrefutable truths in investing. Prudent capital allocation, however, is almost always at the heart of success. Companies, industries, and countries that invest in high-return opportunities while others hesitate consistently outperform.
Vaughan Nelson’s Winners & Warnings series examines these dynamics in real time, identifying the conditions that shape tomorrow’s leaders. Guided by its Capital Allocation Framework (CAF), the Vaughan Nelson team assesses not only what companies do, but when and why. By tracking industry investment levels and returns on capital, they aim to capture the inflection points where leadership changes.
For Further Reading
Capital Allocation Almanac | Vol. 2 — “When Big Oil Tried to Go Electric”
Follow Vaughan Nelson Deputy CIO Adam Rich @AdamRich_CAF on X (formerly Twitter) for more investment insights
