Crude Oil: What It Is and How It Moves Markets

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Crude oil is unrefined petroleum: a liquid mix of hydrocarbons pumped from underground reservoirs and then processed into gasoline, diesel, jet fuel, heating oil, asphalt and the feedstocks behind plastics and chemicals. It moves markets because almost every part of the economy uses it, directly as fuel or indirectly through transport and manufacturing. A sustained change in its price passes through to what households pay at the pump, what companies pay to make and ship goods, and therefore to inflation, corporate profits and stock and bond prices.

Crude oil is also one of the most actively traded commodities, priced both in physical markets for immediate delivery and in futures markets where contracts for later delivery change hands every trading day. How those two prices relate is the basis for reading oil market news and for any investment that tracks oil.

What crude oil is

Crude oil formed over millions of years from the remains of plants, algae and animals buried on ancient sea and lake beds, where sustained heat and pressure converted them into hydrocarbons, molecules made mostly of hydrogen and carbon. It collects in porous rock formations, often trapped beneath a layer of impermeable rock.

Because that process took geological time, crude oil cannot be replaced at anything close to the rate the world consumes it. It is a nonrenewable resource, and its limited, unevenly distributed supply is a large part of why oil carries so much economic and political weight.

Crude grades: light, heavy, sweet and sour

Not all barrels are worth the same. Two physical traits drive most of the difference in value:

• Density. Light crude has a lower density and yields more high-value products such as gasoline and diesel with simpler refining. Heavy crude is denser and needs more processing. The industry measures density with API gravity, where a higher number means a lighter oil.
• Sulfur content. Sweet crude has low sulfur; sour crude has more. Sulfur must be removed to meet fuel standards, which adds cost, so sweet grades generally command a premium over sour grades of similar density.

WTI and Brent are both light, sweet crudes, which is one reason they serve as reference prices. Many other grades are priced as a differential to one of these benchmarks, a premium or discount that reflects their quality, location and transport costs.

From reservoir to refinery

Oil is usually extracted by drilling wells into a reservoir. Conventional wells tap reservoirs where oil flows relatively freely. Horizontal drilling combined with hydraulic fracturing made it economical to produce oil trapped in tight shale rock, reshaping global supply in the 2010s.

At the refinery, crude is first heated in a distillation column, where its components separate by boiling point: lighter fractions such as liquefied petroleum gases and gasoline components rise highest, middle distillates such as kerosene, jet fuel and diesel come off in the middle, and heavy residues such as fuel oil and asphalt stay near the bottom. Cracking (breaking large molecules into smaller ones) and treating (removing sulfur and other impurities) then turn those fractions into finished products.

The spread between the price of crude and the prices of the products made from it is the refiner’s margin. A common simplified gauge is the “crack spread,” which compares the value of the gasoline and diesel produced with the cost of the crude used. Refining stocks tend to track that margin more closely than they track the crude price alone.

Crude oil vs. petroleum products

Petroleum, from the Latin for “rock oil,” is often used as a synonym for crude oil, but strictly it is the broader term, covering both raw crude and everything a refinery makes from crude oil or natural gas liquids.

What crude oil is used for, once refined:

• Transportation fuels: gasoline, diesel, jet fuel and marine fuel oil
• Heating and power: heating oil, kerosene and residual fuel oil
• Liquefied petroleum gases: propane and butane for heating, cooking and petrochemical feedstock
• Petrochemicals: feedstocks for plastics, synthetic fibers, fertilizers, solvents and many other chemicals
• Construction and industry: asphalt for roads and roofing, lubricants and waxes

This breadth is why crude oil is a commodity in the full economic sense: a standardized raw material traded in large volumes, priced by grade, and bought by refiners worldwide who turn it into goods with very different end markets.

How oil became the world’s central commodity

Crude oil became an industrial commodity in the 19th century, when the machines of the Industrial Revolution needed fuel and lubricants. In the late 19th and early 20th centuries, the United States was among the world’s leading producers, and American companies developed much of the technology for turning crude into products such as gasoline.

The 20th century made the global economy dependent on oil, particularly for transportation. Because the largest reservoirs sit in a small number of countries, access to oil became a recurring source of political tension and conflict.

The Organization of the Petroleum Exporting Countries (OPEC) was founded in 1960 by countries holding some of the world’s largest reserves. Through the late 20th century, OPEC members had substantial leverage over global supply and therefore over prices. Their reach extends beyond oil: according to OPEC’s 2024 data, members also hold 35.7% of the world’s natural gas reserves.

U.S. production, meanwhile, fell sharply between 1970 and 2010, and the country became a major importer. That trend reversed around 2010 to 2011, when horizontal drilling and hydraulic fracturing opened up shale formations. U.S. output began rising in 2011 and has more than doubled since then. In 2020, government energy data showed U.S. net imports at one of their lowest annual levels since the mid-1980s, and net exports exceeding net imports for the first time since 1951. The shale boom reduced OPEC’s ability to steer prices on its own. As of 2024 data, the United States, Saudi Arabia and Iraq were the world’s top three oil producers.

The 21st century has added a counterweight to oil’s dominance. Burning fossil fuels is a major cause of global warming, and drilling carries environmental risks including oil spills and damage to marine ecosystems. Electric vehicles, solar and wind power have grown as alternatives, which makes long-run demand one of the central debates for oil producers and investors.

What moves the price of crude oil

At its core, the oil price balances supply and demand. When supply runs ahead of demand, inventories build and prices fall; when demand outpaces supply, inventories draw down and prices rise. In the short run, both sides respond slowly: drivers do not stop commuting because gasoline rises, and new wells take time to bring online. That inelasticity is why relatively small imbalances can produce large price swings, and why oil is typically more volatile than stocks or currencies.

The main forces that shift supply or demand, or expectations of them:

• Producer decisions. OPEC and allied producers set output targets; cuts tend to support prices and increases tend to pressure them. Shale producers respond to price with drilling activity, though with a lag.
• Geopolitics. Conflict, sanctions or unrest in producing regions can remove barrels from the market or raise the risk that they will be removed. The risk alone can move prices before any supply is lost.
• Natural disasters and outages. Hurricanes in the Gulf of Mexico, pipeline failures and refinery shutdowns disrupt production or processing.
• Economic growth. Faster growth means more freight, travel and manufacturing, and more oil consumed. Recessions do the opposite.
• Inventories. Weekly and monthly stockpile data show whether the market is building or drawing crude, and traders compare the figures with expectations.
• The U.S. dollar. Oil is priced internationally in dollars. A stronger dollar makes oil more expensive for buyers using other currencies, which can weigh on demand; a weaker dollar can have the opposite effect.
• Market positioning. Futures traders, including speculators, react to news and sentiment. Their activity adds liquidity and can amplify short-term moves.

A distinction worth holding onto: price moves often reflect changes in perceived supply and demand rather than physical shortages or gluts already under way. A threat to a shipping route can lift prices even if every tanker arrives on time.

How crude oil moves the broader economy and markets

When oil prices rise, gasoline and diesel cost more, airlines and trucking companies pay more for fuel, and manufacturers face higher input and shipping costs. Some of those costs reach consumers, which is why oil price shocks often show up in inflation data. The long record of price changes on our U.S. inflation rate by year page includes periods, such as the 1970s, when energy prices were a major driver.

The effects then spread through financial markets:

• Inflation and interest rates. Higher energy costs can push inflation up, which can lead central banks to keep rates higher for longer. Rate expectations in turn move bond prices, explained in why bond prices fall when interest rates rise.
• Corporate earnings. Oil producers and oilfield service companies generally benefit from higher prices; heavy fuel users such as airlines, shippers and chemical makers generally see costs rise. Refiners depend more on the gap between crude and product prices.
• Consumer spending. Money spent on fuel is money not spent elsewhere, so sustained high gasoline prices can slow spending in other parts of the economy.
• Country economies. Oil-exporting nations gain revenue when prices rise, while importing nations face a larger import bill and pressure on their currencies.

Falling prices reverse these channels, but not always as a clean benefit: a sharp drop can signal weakening global demand, and it can strain producers, their lenders and regions that depend on drilling activity.

The two main benchmarks: WTI and Brent

Thousands of crude grades exist, but two futures contracts anchor global pricing.

• West Texas Intermediate (WTI) is the North American benchmark. Its futures trade on NYMEX, and the contract’s delivery point is Cushing, Oklahoma, a major storage and pipeline hub.
• Brent is the benchmark for crude from the North Sea and is used to price much of the oil traded in Europe, Africa and the Middle East. Its futures trade on ICE.

The two prices generally move together, but not identically. WTI is more sensitive to conditions in the United States, such as domestic production, pipeline capacity and Cushing inventories, while Brent responds more to developments elsewhere in the world. The gap between them, the Brent-WTI spread, reflects those regional factors along with quality and transport costs.

Spot prices vs. futures prices

Oil trades in two time frames, and much of the vocabulary of oil markets comes from comparing them.

A spot transaction is for oil delivered now or very soon. The spot price is the current market price for physical oil. Money changes hands and the buyer takes delivery. In oil, demand for immediate delivery is limited by logistics: crude has to be moved by pipeline, tanker or rail and stored somewhere, so most physical buyers arrange supply in advance.

A futures contract is an agreement to buy or sell a set quantity of oil at a set price on a set future date. The futures price is not a forecast of the spot price on that date; it is the price at which the market clears given current information.

How an oil futures contract works

When a trader buys or sells a futures contract, neither side pays the full value up front. Each posts margin, a deposit covering a fraction of the contract’s value, with the clearinghouse. Positions are marked to market daily, so gains are credited and losses debited each day. If losses drain the account below the required maintenance level, the trader must add funds or have the position closed.

Hypothetical example (not current prices or margin requirements): The standard NYMEX WTI contract covers 1,000 barrels. Suppose a trader buys one contract at $70 per barrel. The notional value is 1,000 × $70 = $70,000. If the price rises to $72, the position gains 1,000 × $2 = $2,000; if it falls to $67, the position loses $3,000. Assume the trader posted $7,000 of margin. A $3 drop would wipe out more than 40% of that deposit even though the oil price fell only about 4%. That leverage works in both directions and is the main source of risk in futures trading.

Different participants use futures for different purposes. Producers and large consumers, such as airlines or refiners, use them to hedge, locking in a price to reduce uncertainty. Speculators take positions to profit from price changes. Most speculative positions are closed or “rolled” into a later contract month before expiry so the trader never has to take delivery of physical oil.

Several contract months are listed at any time. Most trading concentrates in the front month, the contract nearest to expiry, which is why it is also called the most active contract. Headline oil prices in the news usually refer to the front-month future, not a physical spot quote.

One historical episode shows how delivery logistics can override everything else. On April 20, 2020, with pandemic lockdowns collapsing demand and storage at Cushing filling up, the expiring May WTI contract settled below minus $37 a barrel. Holders who could not take or store physical oil paid others to take contracts off their hands. Later contract months stayed positive, which illustrates that the front-month price can reflect the mechanics of expiry, not only the long-term value of oil.

Contango and backwardation

Futures prices can be above, below or equal to the spot price, and each contract month can trade at a different level. The shape of that price curve says something about current conditions.

• Contango: later futures trade above the spot price or nearer contracts. This is common when near-term supply is ample, because someone holding oil for later delivery has to pay for storage, insurance and financing, and the futures premium compensates for those carrying costs. A steep contango usually points to plentiful current supply relative to demand.
• Backwardation: later futures trade below the spot price or nearer contracts. This tends to appear when near-term supply is tight and buyers will pay a premium to have oil now rather than later.

The curve reflects both expectations and the physical cost of carrying oil, so it is best read alongside inventory data rather than as a forecast on its own.

The curve shape matters directly to anyone holding a fund that owns futures. Hypothetical example: a fund holds the front-month contract at $70. As expiry approaches, it sells that contract and buys the next month at $71.50. In contango, every roll means selling lower and buying higher, which drags on returns even if the spot price stays flat. In backwardation, the roll works in the holder’s favor. Over months, that “roll yield” can cause a futures-based oil fund to perform very differently from the spot price quoted in headlines.

Ways to invest in crude oil

For an individual investor, oil can serve as a speculative position, a portfolio diversifier or a hedge against other exposures, such as a business that suffers when fuel costs rise. The routes differ sharply in how closely they track the oil price and how much risk they carry.

1. Futures contracts. Direct exposure to a benchmark with high leverage. They require a futures account, margin, daily monitoring and active management of expiry and rolls.
2. Options on futures. Calls and puts give the right, but not the obligation, to enter a futures position at a set price. Buying options caps the loss at the premium paid; selling them can expose the seller to large losses.
3. Exchange-traded funds and notes. Oil ETFs trade like stocks in an ordinary brokerage account. Many hold futures, so they are exposed to the roll effects described above. Some funds spread holdings across several contract months to reduce that effect, and leveraged or inverse products reset daily, which makes their multi-day returns diverge from a simple multiple of oil’s move.
4. Energy company stocks. Shares of producers (upstream), pipeline and storage operators (midstream) and refiners (downstream) offer indirect exposure. Their returns depend on management, costs, debt and dividends as well as oil, and each segment reacts to prices differently. Standard fundamental analysis applies, and the wider toolkit is covered in stock analysis.
5. Energy sector funds. Mutual funds and ETFs holding baskets of energy companies diversify away single-company risk but still carry stock market risk along with oil.

Whatever the route, oil’s volatility means position size matters. Measures such as value at risk help estimate how much a position could lose over a given period at a chosen confidence level.

How economists try to forecast oil prices

Forecasting oil is difficult because prices respond to many interacting factors, some of which, such as wars or pandemics, cannot be predicted at all. Forecasters rely on several families of models:

1. Futures prices. Central banks and the International Monetary Fund commonly use them as a baseline. They reflect market consensus but have a mixed record as predictors.
2. Regression-based structural models estimate how factors such as OPEC decisions, inventory levels, production costs and consumption affect prices, but they fail when a relevant factor is left out or an unexpected one emerges.
3. Time-series models such as exponential smoothing, ARIMA and ARCH or GARCH project future values from the price’s own history.
4. Bayesian vector autoregressive (BVAR) models add probability estimates about how events and variables interact and are widely used in contemporary research.
5. Dynamic stochastic general equilibrium (DSGE) models place oil within macroeconomic theory and work best when policies and relationships stay stable.

No single model consistently produces the most accurate forecasts, and a model that works in one period may fail in the next. Economists therefore often combine forecasts from several models to improve accuracy.

OPEC and its members

OPEC’s statutes open membership to any country that is a substantial net exporter of oil and shares the organization’s ideals. Five countries founded it in 1960: Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. Others joined over the following decades, and several have since left or suspended membership: Indonesia suspended its membership on November 30, 2016, Qatar ended its membership on January 1, 2019, Ecuador withdrew on January 1, 2020, and Angola left as of January 2024.

That leaves 12 member states:

• Algeria
• Republic of the Congo
• Equatorial Guinea
• Gabon
• Iran
• Iraq
• Kuwait
• Libya
• Nigeria
• Saudi Arabia
• United Arab Emirates
• Venezuela

OPEC members coordinate production targets at regular meetings, and since 2016 the group has also coordinated with other major producers, including Russia, in the wider arrangement known as OPEC+. Announcements of production cuts or increases are among the most closely watched events in the oil market, because they change expected supply directly.

How to follow the crude oil market

Benchmark quotes and energy news are widely available free from major financial news services. For the data behind those headlines, a few recurring releases carry the most weight:

• U.S. Energy Information Administration (EIA) Weekly Petroleum Status Report. Published weekly, it shows U.S. crude and product inventories, production, refinery activity and imports. Prices often react when inventory changes differ from expectations.
• EIA Short-Term Energy Outlook. A monthly forecast of supply, demand and prices.
• OPEC Monthly Oil Market Report and the International Energy Agency’s monthly oil market report, which give global supply and demand estimates.
• Rig counts. Weekly counts of active drilling rigs are a leading indicator of future U.S. production.
• OPEC and OPEC+ meeting outcomes. Decisions on output targets can move prices on announcement.

FAQs

The Bottom Line

Investors weighing oil exposure should match the route to their tolerance for leverage and tracking error. Futures and options offer direct but leveraged exposure, oil ETFs can drift from the spot price because of roll effects, and energy stocks add company and market risk. Because oil is more volatile than stocks or currencies, position size and inventory and OPEC+ news deserve close attention.