Oil & Gas

The global oil and gas industry is the largest sector in the world economy, generating approximately $6.3 trillion in annual revenue and employing tens of millions of people across more than 100 countries. Oil and natural gas together supply roughly 55% of the world's primary energy, powering transportation, heating, electricity generation, and serving as the essential feedstock for petrochemicals that underpin modern life.

This primer gives someone new to the energy sector a comprehensive understanding of how the industry works, who the key players are, how the various sub-sectors interconnect, and what drives profitability and investment returns across the value chain. The oil and gas industry is organized into three primary segments — Upstream (exploration and production), Midstream (transportation, storage, and processing), and Downstream (refining, marketing, and petrochemicals) — each with distinct economics, risk profiles, and competitive dynamics. A fourth critical segment, Oilfield Services (OFS), provides the equipment, technology, and labor that enables the other three to function.

The industry is characterized by several defining features: the outsized role of national oil companies (NOCs) that control roughly 75% of global proved reserves; the cyclical nature of commodity prices driven by supply, demand, inventories, and geopolitics; the capital-intensive, long-cycle nature of major projects; the critical importance of OPEC+ as a supply management cartel; the ongoing tension between energy transition and energy security; and the recent era of capital discipline that has fundamentally changed how public E&P companies allocate capital.

The oil and gas industry encompasses the entire chain of activities required to find, extract, transport, process, and deliver petroleum products and natural gas to end consumers. The global oil and gas market was valued at approximately $6.1 trillion in 2024 and is estimated at $6.3 trillion in 2025. The industry accounts for roughly 3-5% of global GDP depending on commodity prices.

End Markets

Transportation (~55% of oil demand): Gasoline, diesel, jet fuel, bunker fuel, and increasingly LNG for shipping. Transportation remains the single largest source of oil demand globally, though the rise of electric vehicles is beginning to erode gasoline demand growth in developed markets.

Industrial (~20% of oil demand, ~30% of gas demand): Petrochemical feedstocks (naphtha, ethane, propane, butane), process heat, and industrial fuel. The petrochemical sector is the fastest-growing source of oil demand.

Power Generation (~25% of gas demand): Natural gas is the preferred fuel for electricity generation in many markets due to its lower carbon intensity relative to coal.

Residential & Commercial (~25% of gas demand): Heating, cooking, and hot water. Natural gas remains the dominant heating fuel in North America and much of Europe.

Upstream: Exploration & Production (E&P)

The upstream segment is where hydrocarbons are found and extracted from the earth. This is the highest-risk, highest-reward part of the value chain, and it is where commodity price exposure is most direct. Exploration involves identifying prospective geological formations through seismic surveys. Drilling bores wellbores into the earth to reach hydrocarbon reservoirs. Production is the ongoing extraction of oil and gas from producing fields.

Midstream: Transportation, Storage & Processing

The midstream segment connects upstream production to downstream consumers. It encompasses the physical infrastructure that moves hydrocarbons from the wellhead to refineries, processing plants, export terminals, and end users. Midstream assets are often described as "toll road" businesses because they earn fees based on volumes transported or processed, with limited direct commodity price exposure.

Pipelines are the backbone of the midstream sector. The United States alone has approximately 2.6 million miles of pipelines. Gathering & Processing involves collecting raw natural gas from wellheads and separating valuable NGLs from the methane stream. Storage facilities provide the buffer between production and consumption. Marine Transportation includes tankers for crude oil, LNG carriers, and product tankers — approximately 60% of global oil trade moves by sea.

Master Limited Partnerships (MLPs): Many midstream assets in the US are held within MLP structures — publicly traded partnerships that pay no entity-level income tax and distribute the majority of their cash flow to unitholders. MLPs issue K-1 tax forms (not 1099s), and their distributions are largely tax-deferred return of capital. Key MLP metrics include distribution yield, distributable cash flow (DCF) coverage ratio, and EV/EBITDA.

Downstream: Refining, Marketing & Petrochemicals

The downstream segment converts crude oil into usable products and delivers them to end consumers. Refining is the process of converting crude oil into finished petroleum products through distillation, conversion, and blending.

Refinery Complexity is a critical concept. The Nelson Complexity Index measures a refinery's sophistication — a simple topping refinery scores ~2, while a highly complex US Gulf Coast facility scores 12-15. Higher complexity allows processing cheaper, heavier crude oils and producing a higher proportion of valuable light products.

Crack Spread is the key profitability metric for refiners — the difference between the price of refined products and the cost of crude oil. The most commonly quoted is the "3-2-1" crack spread: the margin from converting 3 barrels of crude into 2 barrels of gasoline and 1 barrel of diesel.

Oilfield Services (OFS)

The oilfield services sector provides the equipment, technology, and expertise that E&P companies need to find and produce hydrocarbons. OFS companies are the "picks and shovels" of the oil patch.

The OFS industry is dominated by three global diversified players — SLB (~$36B revenue), Halliburton (~$23B), and Baker Hughes (~$27B) — who together account for roughly 35-40% of the global market.

How Oil Is Priced

Crude oil is a globally traded commodity, but not all crude oils are the same. Crude varies by density (API gravity — light vs. heavy) and sulfur content (sweet vs. sour). The two primary global benchmark crudes are:

Brent Crude — Produced in the North Sea, Brent is the benchmark for roughly two-thirds of globally traded crude. It is a light, sweet crude (API ~38, sulfur ~0.37%).

West Texas Intermediate (WTI) — Produced in the US Permian Basin and delivered to Cushing, Oklahoma, WTI is the benchmark for US-produced crude. It is slightly lighter and sweeter than Brent (API ~40, sulfur ~0.24%).

Supply-Demand Fundamentals

Global oil supply in 2025 was approximately 104.4 million barrels per day. The supply side is dominated by three groups:

• OPEC+ (~40% of global supply) — Collectively manages production through agreed quotas. OPEC+ has cut output by a cumulative 5.86 million b/d since late 2022 to support prices.
• Non-OPEC, Non-US (~30%) — Includes Russia, Brazil, Norway, Canada, Guyana. Brazil's pre-salt deepwater and Guyana's Stabroek block are the most significant growth stories.
• United States (~20%) — The US shale revolution transformed America into the world's largest oil producer at ~13.5 million b/d. The Permian Basin alone produces ~6 million b/d.

Global oil demand in 2025 grew by approximately 830,000 b/d, with growth concentrated in non-OECD countries. The IEA projects demand growth of ~640,000 b/d in 2026.

The Oil Price Cycle

Oil prices are inherently cyclical, driven by the lag between investment decisions and production response:

• Phase 1 — High prices → Increased investment in new supply → New projects take 3-7 years to come online
• Phase 2 — New supply arrives → Market becomes oversupplied → Prices fall
• Phase 3 — Low prices → Investment is cut → Existing fields decline → Supply tightens
• Phase 4 — Tight supply → Prices rise → Cycle repeats

This cycle has played out repeatedly: the 2008 spike to $147/bbl, the 2014-2016 collapse from $100 to $26, the 2020 COVID crash to negative prices, and the 2022 spike above $120 following Russia's invasion of Ukraine. Understanding where the industry sits in this cycle is essential for any energy investor.

Natural gas has emerged as the "transition fuel" of the 21st century — cleaner than coal for power generation, abundant in supply, and increasingly traded globally through LNG.

Gas Pricing

Unlike oil, which is priced on a single global benchmark, natural gas prices vary significantly by region:

The wide price differential between US gas (~$3/MMBtu) and international gas ($10-15/MMBtu) is the fundamental driver of the US LNG export buildout.

The Shale Gas Revolution

The US shale gas revolution, enabled by horizontal drilling and hydraulic fracturing, transformed the American energy landscape. Key shale gas basins include the Marcellus (Pennsylvania/West Virginia), Haynesville (Louisiana/Texas), Utica (Ohio), and the Permian Basin (associated gas from oil production). US dry gas production has grown from ~21 Tcf/year in 2005 to ~37 Tcf/year in 2025.

Liquefied Natural Gas (LNG)

LNG has transformed natural gas from a regional commodity into a globally traded one. The LNG process involves cooling natural gas to -260°F (-162°C), reducing its volume by ~600x for efficient marine transport. Global LNG trade reached 411 million tonnes in 2024, connecting 22 exporting markets with 48 importing markets. A massive wave of new LNG export capacity — approximately 300 bcm/year — is expected to come online by 2030.

International Oil Companies (IOCs)

The IOCs are the publicly traded, vertically integrated majors that operate across the entire value chain. They are the successors to the "Seven Sisters" that once dominated the global oil industry.

National Oil Companies (NOCs)

NOCs control approximately 75% of the world's proved oil reserves and account for roughly 60% of global production. They are typically state-owned and serve dual mandates — commercial returns and national policy objectives.

Independent E&P Companies

Midstream Companies

Refiners

Oilfield Services

How Governments Take Their Share

Oil and gas resources are owned by the sovereign state in most countries (the US and Canada are notable exceptions where mineral rights can be privately owned). Governments grant companies the right to explore and produce through various fiscal arrangements:

• Concession / Royalty-Tax System — The company pays a royalty (12.5-25%) plus income tax on profits. The company books the reserves and owns the production. Dominant in the US, UK, Norway, Canada.
• Production Sharing Contract (PSC) — Production is split between 'cost oil' (to recover investment) and 'profit oil' (split 60-80% to government). Common in Southeast Asia, Africa.
• Service Contract — The company provides services for a fixed fee per barrel. The government retains all reserves and production. Common in Iran, Iraq.

Key Economic Metrics

The Capital Discipline Revolution

The most significant structural change in the oil and gas industry over the past decade has been the shift toward capital discipline. Prior to 2020, US shale producers pursued aggressive production growth, often spending more than they earned. The COVID-19 price collapse and investor pressure forced a fundamental rethinking.

Today, public E&P companies operate under a framework that prioritizes: (1) maintenance capital spending, (2) debt reduction, (3) base dividends, (4) variable dividends or share buybacks, and (5) only modest organic growth. This discipline has resulted in record free cash flow generation and significantly higher shareholder returns — but it has also constrained supply growth, contributing to tighter global oil markets.

The Organization of the Petroleum Exporting Countries (OPEC) was founded in 1960 and has since expanded to 12 members. In 2016, OPEC formed an alliance with 10 non-OPEC producers (led by Russia) known as OPEC+, which collectively controls roughly 40% of global oil production and over 80% of proved reserves.

Geopolitical Risk Premium

Oil prices incorporate a "geopolitical risk premium" that fluctuates based on perceived threats to supply:

• Strait of Hormuz — ~21 million b/d of oil transits this chokepoint between Iran and Oman. Any disruption would be catastrophic for global supply.
• Russia-Ukraine War — Western sanctions have redirected ~5 million b/d of Russian crude from Europe to Asia, reshaping global trade flows.
• Middle East Instability — Conflicts involving Iran, Yemen (Houthi attacks on Red Sea shipping), and broader regional tensions periodically spike the risk premium.
• Venezuela and Libya — Both countries have massive reserves but chronically underperform due to political instability and underinvestment.

The oil and gas industry exists in an era of unprecedented uncertainty about long-term demand. The global push to reduce carbon emissions raises fundamental questions about the future of fossil fuels.

Competing Demand Scenarios

The reality will likely fall somewhere between STEPS and APS. Even in aggressive transition scenarios, oil demand for petrochemicals, aviation, and marine fuel is expected to remain substantial for decades.

How Companies Are Responding

• European Majors — Shell, BP, TotalEnergies initially pivoted aggressively toward renewables but have recently scaled back ambitions as returns disappointed.
• US Majors — ExxonMobil and Chevron have largely doubled down on oil and gas, arguing the world will need hydrocarbons for decades. Exxon has invested in carbon capture rather than wind and solar.
• NOCs — Generally continuing to invest in expanding production capacity, viewing the transition as a multi-decade process that will be slower than Western forecasts suggest.

Upstream (E&P) Valuation

Midstream Valuation

Downstream (Refining) Valuation

Oilfield Services Valuation