Crude oil

Crude oil
Nefronus · CC0 · source
Name	Crude oil
Type	Fossil fuel
Discovered	Antiquity
Primary locations	Persian Gulf, North Sea, Gulf of Mexico, West Siberian Basin, Orinoco Belt
Producers	Saudi Arabia, United States, Russia, Canada, Iran
Consumption	Global

Crude oil is a naturally occurring hydrocarbon liquid found in geological formations beneath the Earth's surface. It has been a central energy resource since the 19th century and shaped industrial, political, and technological developments across regions such as the Persian Gulf, North Sea, Gulf of Mexico, and West Siberian Basin. Markets and policies involving the resource link actors like OPEC, International Energy Agency, World Bank, and national state companies including Saudi Aramco, Rosneft, and ExxonMobil.

Overview

The commodity is traded on exchanges and benchmarks such as Brent crude, West Texas Intermediate, Dubai Mercantile Exchange, and informs indices used by entities like International Monetary Fund and Bloomberg. Major geopolitical events—examples include the 1973 oil crisis, Iran–Iraq War, Gulf War, and sanctions involving Iran and Russia—have influenced pricing, supply, and strategic reserves like the United States Strategic Petroleum Reserve. Multinational corporations and state actors such as BP, Shell plc, TotalEnergies, Chevron, and China National Petroleum Corporation coordinate exploration, development, and trade.

Formation and Geology

Hydrocarbon accumulation is governed by sedimentary basin evolution seen in provinces like the Permian Basin, Bakken formation, Eagle Ford, Orinoco Belt, and Ghawar Field. Organic matter from marine plankton and continental plants in source rocks such as shale undergoes burial, thermal maturation, and migration into reservoir rocks like sandstone and carbonate linked to traps found in structures comparable to those studied in the North Sea oil fields and Caspian Sea region. Geological techniques developed at institutions such as US Geological Survey and Society of Petroleum Engineers use seismic surveys pioneered in projects by companies like Schlumberger and Halliburton to map prospects.

Composition and Grades

The fluid comprises a mixture of alkanes, cycloalkanes, aromatic hydrocarbons, and heteroatom-bearing molecules; chemical characterization uses methods standardized by American Petroleum Institute and laboratories at universities such as Texas A&M University and Imperial College London. Classification into light, medium, heavy and extra-heavy grades occurs in basins like the Venezuelan Basin (notably Orinoco Belt heavy oil) and the Athabasca oil sands yielding bitumen upgraded by firms including Suncor Energy. Sulfur content differentiates sweet and sour streams, influencing processing regulations overseen by bodies like the Environmental Protection Agency and trade handled by companies such as Trafigura.

Extraction and Production

Technologies include conventional primary, secondary, and tertiary recovery; enhanced oil recovery methods like steam injection used in the Athabasca oil sands and CO2 injection trialed in fields such as the Weyburn project. Offshore platforms in regions like the North Sea and Gulf of Mexico employ rigs built by firms such as Transocean and Saipem. Unconventional production from shale plays (e.g., Bakken formation, Eagle Ford, Marcellus Shale for associated liquids) relies on horizontal drilling and hydraulic fracturing techniques commercialized by companies like Halliburton and Baker Hughes. National policies in Saudi Arabia, Russia, Canada, United States, and Norway influence output via licensing, state companies, and fiscal regimes.

Refining and Processing

Refineries owned by groups like ExxonMobil, Shell plc, and PDVSA convert feedstocks into products through distillation, catalytic cracking, coking, hydroprocessing, and alkylation, with complex refineries located in hubs such as Rotterdam, Houston, Jebel Ali, and Port of Singapore. Petrochemical feedstocks produced via steam reforming and naphtha cracking supply industries connected to corporations like BASF, Dow Chemical Company, and SABIC. Standards and safety oversight are informed by organizations including American Petroleum Institute and accident investigations by agencies like the National Transportation Safety Board.

Uses and Economic Importance

Refined products power transportation fleets, aviation sectors (involving carriers such as British Airways and Delta Air Lines), shipping lines like Maersk, and military fleets including those of United States Navy and Royal Navy. Feedstocks underpin petrochemical value chains producing plastics, fertilizers, and solvents used by manufacturers such as Toyota, Procter & Gamble, and Boeing. Fiscal revenue from production shapes budgets in petroleum-dependent states like Norway, Venezuela, United Arab Emirates, and Kuwait and interacts with financial markets, sovereign wealth funds (e.g., Norwegian Government Pension Fund Global), and exchanges such as New York Mercantile Exchange.

Environmental and Health Impacts

Extraction, transport, and refining have led to incidents like the Deepwater Horizon oil spill and routine emissions regulated under frameworks developed by United Nations Framework Convention on Climate Change and national agencies including the Environmental Protection Agency and European Environment Agency. Combustion of derived fuels contributes to greenhouse gas emissions tracked by Intergovernmental Panel on Climate Change and fuels debates over transitions promoted in agreements such as the Paris Agreement. Local contamination events prompt litigation in courts such as the International Court of Justice and enforcement actions by regulators like Department of Justice (United States), while public health concerns are studied by institutions including World Health Organization and Centers for Disease Control and Prevention.

Category:Fossil fuels