Petroleum (from Latin petra – rock and oleum – oil), crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish flammable liquid, which exists in the upper strata of some areas of the Earth's crust. It consists of a complex mixture of various hydrocarbons, largely of the alkane series, but may vary much in appearance, composition, and purity. It is an important "primary energy" source (IEA Key World Energy Statistics). Petroleum is also the raw material for many chemical products, including solvents, fertilizers, pesticides, and plastics.
Most geologists view crude oil, like coal and natural gas, as the product of compression and heating of ancient vegetation over geological timescales. According to this theory, it is formed from the decayed remains of prehistoric marine animals and terrestrial plants. Over many centuries this organic matter, mixed with mud, is buried under thick sedimentary layers of material. The resulting high levels of heat and pressure cause the remains to metamorphose first into a waxy material known as kerogen, and then into liquid and gaseous hydrocarbons in a process known as Catagenesis. These then migrate through adjacent rock layers until they become trapped underground in porous rocks called reservoirs, forming an oil field, from which the liquid can be extracted by drilling and pumping.
Thomas Gold was the most widely known Western proponent of the Russian-Ukrainian theory of abiogenic petroleum origin. This theory suggests that large amounts of carbon exist naturally in the planet, some in the form of hydrocarbons. Hydrocarbons are less dense than aqueous pore fluids, and so migrate upward. Deep microbial lifeforms convert them into the various hydrocarbon deposits. Thermodynamic calculations and experimental studies confirm that n-alkanes (common petroleum components) do not spontaneously evolve from methane at pressures typically found in sedimentary basins, and so the theory of an abiotic origin of hydrocarbons suggests deep generation (below 200 km) (see results).
In refining, the component chemicals of petroleum are separated by distillation. Products based on refined crude oil include kerosene, benzene, gasoline, paraffin wax, asphalt, etc. Subtler techniques, such as gas chromatography, HPLC, and GC-MS, can separate some fractions of petroleum into individual compounds.
Strictly speaking, petroleum consists of hydrocarbons: compounds of hydrogen and carbon; and non-hydrocarbon fractions: compounds which might also include nitrogen, sulfur, oxygen, or traces of metals such as vanadium or nickel.
The four lightest alkanes — CH4 (methane), C2H6 (ethane), C3H8 (propane) and C4H10 (butane) — are all gases, boiling at -161.6°C, -88.6°C, -42°C, and -0.5°C, respectively (-258.9°, -127.5°, -43.6°, and +31.1° F).
The chains in the C5–7 range are all light, easily vaporized, clear naphthas. They are used as solvents, dry cleaning fluids, and other quick-drying products. The chains from C6H14 through C12H26 are blended together and used for gasoline. Kerosene is made up of chains in the C10 to C15 range, followed by diesel fuel/heating oil (C10 to C20) and heavier fuel oils as the ones used in ship engines. These petroleum compounds are all liquid at room temperature.
Lubricating oils and semi-solid greases (including Vaseline®) range from C16 up to C20.
Chains above C20 form solids, starting with paraffin wax, then tar and asphaltic bitumen.
Boiling ranges of petroleum atmospheric pressure distillation fractions in degrees Celsius:
- petrol ether: 40 – 70 °C (used as solvent)
- light petrol: 60 – 100 °C (automobile fuel)
- heavy petrol: 100 – 150 °C (automobile fuel)
- light kerosene: 120 – 150 °C (household solvent and fuel)
- kerosene: 150 – 300 °C (jet engine fuel)
- gas oil: 250 – 350 °C (Diesel fuel/ heating)
- lubrication oil: > 300 °C (engine oil)
- remaining fractions: tar, asphalt, residual fuel
Generally the first stage in the extraction of crude oil is to drill a well into the underground reservoir. Historically, in the USA some oil fields existed where the oil rose naturally to the surface, but most of these fields have long since been depleted. Often many wells will be drilled into the same reservoir, to ensure that the extraction rate will be economically viable. Also some wells may be used to pump water, steam or various gas mixtures into the reservoir to raise or maintain the reservoir pressure, and so maintain an economic extraction rate.
If the underground pressure in the oil reservoir is sufficient then the oil will be forced to the surface under this pressure. Gaseous fuels or natural gas are usually present, which also supplies needed underground pressure. In this situation it is sufficient to place a complex arrangement of valves on the well head to connect the well to a pipeline network for storage and processing.
Over the lifetime of the well the pressure will fall, and at some point there will be insufficient underground pressure to force the oil to the surface and the remaining oil in the well must be pumped out. see: Energy balance and Net energy gain.
Various techniques aid in recovering oil from depleted or low pressure reservoirs, including Beam Pumps, Electrical Submersible Pumps (ESPs), and Gas Lift. Other techniques include Water Injection and Gas Re-injection, which help to maintain reservoir pressure.
The first oil wells were drilled in China in the 4th century or earlier. The oil was burned to evaporate brine and produce salt. By the 10th century, extensive bamboo pipelines connected oil wells with salt springs.
The modern history of oil began in 1853, with the discovery of the process of oil distillation. Crude oil was distilled into kerosene by Ignacy Lukasiewicz, a Polish scientist. The first "rock oil" mine was created in Bobrka, near Krosno in southern Poland in the following year and the first refinery (actually a distillery) was built in Ulaszowice, also by Lukasiewicz.
The American petroleum industry began with Edwin Drake's discovery of oil in 1859, near Titusville, Pennsylvania. The industry grew slowly in the 1800s and did not become a real national concern until the early part of the 20th century; the introduction of the internal combustion engine provided a demand that has largely sustained the industry to this day. Early "local" finds like those in Pennsylvania and Ontario were quickly exhausted, leading to "oil booms" in Texas, Oklahoma, and California. Other countries had sizable oil reserves as a part of their colonial holdings, and started to develop them at an industrial level.
While even in 1955 coal was still the world's foremost fuel, oil began to take over. Following the 1973 energy crisis and the 1979 energy crisis there was significant media coverage of oil supply levels. This brought to light the concern that oil is a limited resource that will eventually run out, at least as an economically viable energy source. At the time, the most common and popular predictions were always quite dire, and when they did not come true, many dismissed all such discussion. The future of petroleum as a fuel remains somewhat controversial. USA Today news (2004) reports that there is 40 years of petroleum left in the ground. Some would argue that because the total amount of petroleum is finite, the dire predictions of the 1970s have merely been postponed. Others argue that technology will continue to allow for the production of cheap hydrocarbons and that the earth has vast sources of unconventional petroleum reserves in the form of tar sands, bitumen fields and oil shale that will allow for petroleum use to continue for an extremely long period in the future.
Today about 90% of fuel needs are met by oil. Petroleum's worth as a portable, dense energy source powering the vast majority of vehicles and as the base of many industrial chemicals makes it one of the world's most important commodities. Access to it was a major factor in several military conflicts, including World War II and the Persian Gulf War. About 80% of the world's readily accessible reserves are located in the Middle East. USA territory has less than 3%.
The presence of oil has significant social and environmental impacts, from accidents and routine activities such as seismic exploration, drilling, and generation of polluting wastes. Oil extraction is costly and sometimes environmentally damaging, although Dr. John Hunt from Woods Hole pointed out in a 1981 paper that over 70% of the reserves in the world are associated with visible macroseepages, and many oil fields are found due to natural leaks. Offshore exploration and extraction of oil disturbs the surrounding marine environment. Extraction may involve dredging, which stirs up the sea bed, killing the sea plants that marine creatures need to survive. Crude oil and refined fuel spills from tanker ship accidents have damaged fragile ecosystems in Alaska, the Galapagos Islands, Spain, and many other places. Renewable energy source alternatives do exist, although the degree to which they can replace petroleum and the possible environmental damage they may cause is controversial.
Future of oil
Main article: Hubbert Peak
The Hubbert peak theory, also known as peak oil, is a controversial theory concerning the long-term rate of conventional oil and other fossil fuel production and depletion. It assumes that oil reserves are not replenished, and predicts that future world oil production must inevitably reach a peak and then decline as these reserves are exhausted. Much of the controversy is over whether past production or discovery data can be used to predict a future peak. Based on available production data, proponents have previously (and incorrectly) predicted the peak years to be 1989, 1995, or 1995–2000. A new prediction by Goldman Sachs picks 2007 for oil and some time later for natural gas.
The oil industry classifies "crude" by the location of its origin (e.g., "West Texas Intermediate, WTI" or "Brent") and often by its relative weight or viscosity ("light", "intermediate" or "heavy"); refiners may also refer to it as "sweet", which means it contains relatively little sulfur, or as "sour", which means it contains substantial amounts of sulfur and requires more refining in order to meet current product specifications.
The world reference barrels are:
- Brent Blend, comprising 15 oils from fields in the Brent and Ninian systems in the East Shetland Basin of the North Sea. The oil is landed at Sullom Voe terminal in the Shetlands. Oil production from Europe, Africa and Middle Eastern oil flowing West tends to be priced off the price of this oil, which forms a benchmark.
- West Texas Intermediate (WTI) for North American oil.
- Dubai used as benchmark for the Asia-Pacific region for Middle East Oil
- Tapis (from Malaysia, used as a reference for light Far East oil)
- Minas (from Indonesia, used as a reference for heavy Far East oil)
- The OPEC Basket consisting of
OPEC attempts to keep the price of the Opec Basket between upper and lower limits, by increasing and decreasing production. This makes the measure important for market analysts. The OPEC Basket, including a mix of light and heavy crudes, is heavier than both Brent and WTI.
See also 
The main benchmark oil prices are West Texas Intermediate, Brent and Dubai. The price of a barrel of oil is highly dependent on its grade and location. The vast majority of oil will not be traded on an exchange but either on a Over-the-counter_trading basis or as an intra-company transaction.
The price of oil fluctuates quite widely in response to crises or recessions in major economies, because any economic downturn reduces the demand for oil. On the supply side the OPEC cartel uses its influence to stabilise or raise oil prices. During 2004, the OPEC official price range for its crude oil is US $22 to US $28 per barrel.
A recent low point was reached in January 1999, after increased oil production from Iraq coincided with the Asian financial crisis, which reduced demand. The prices then rapidly increased, more than doubling by September 2000, then fell until the end of 2001 before steadily increasing, reaching US $40 to US $50 per barrel by September 2004 (see Oil price increases of 2004).  In October 2004, light crude futures on the NYMEX for November delivery exceeded US $53 per barrel and for December delivery exceeded US $55 per barrel.
The New York Mercantile Exchange (NYMEX) trades crude oil (including futures contracts) and provides the basis of US crude oil pricing via WTI (West Texas Intermediate). Other exchanges also trade crude oil futures, eg the International Petroleum Exchange (IPE) in London trades contracts in Brent crude. Wet oil is normally bought and sold via bilateral deals between companies, typically with reference to a marker crude oil grade that is typically quoted via the pricing agency Platts, for example in Europe a particular grade of oil, say Fulmar, might be sold at a price of "Brent plus US$0.25/barrel".
Top petroleum producing countries
(Ordered by amount produced in 2003):
- Saudi Arabia (OPEC)
- United States
- Iran (OPEC)
- United Arab Emirates (U.A.E) (OPEC)
- Venezuela (OPEC)
- United Kingdom (U.K)
- Kuwait (OPEC)
- Nigeria (OPEC)
(Ordered by amount exported in 2003):
- Saudi Arabia (OPEC)
- Iran (OPEC)
- United Arab Emirates (U.A.E) (OPEC)
- Venezuela (OPEC)
- Kuwait (OPEC)
- Nigeria (OPEC)
- Algeria (OPEC)
- Libya (OPEC)
Note that the USA consumes almost all of its own production.
- List of oil fields
- List of oil-producing states.
- List of petroleum companies.
- Energy crisis: 1973 energy crisis, 1979 energy crisis.
- Fossil fuel.
- Greenhouse gases.
- History of the Petroleum Industry.
- Hubbert peak (aka peak oil).
- Future energy development.
- 1990 spike in the price of oil
- Non-conventional oil.
- Oil imperialism.
- Oil price increases of 2004
- Oil price increases of 2005
- Oil refinery.
- Oil supplies.
- Oil well.
- Olduvai theory (not strictly about oil, but it basically assumes that oil and gas are the only significant energy sources).
- Petroleum disasters.
- Petroleum politics.
- Renewable energy.
- Thermal depolymerization.
- American Petroleum Institute – A site run by the American Petroleum Institute, the trade association of the US oil industry.
- US Energy Information Administration – Part of the informative website of the US Government's Energy Information Administration.
- Major dates of the Polish petroleum industry
- Dismissal of the Claims of a Biological Connection for Natural Petroleum.
- An introduction to the modern petroleum science, and to the Russian-Ukrainian theory of deep, abiotic petroleum origins.
- The End of the Age of Oil – article adapted from a talk by Caltech vice provost and professor of physics David Goodstein
- The Politics of Oil – A report on the oil industry's influence of lawmakers and public policy by the Center for Public Integrity.
- BBC: Stability fears rise as oil reliance grows
Books about the petroleum industry
- James Howard Kunstler (2005). The Long Emergency: Surviving the Converging Catastrophes of the Twenty-first Century. Atlantic Monthly Press. 0871138883.
- (2004). The Coming Oil Crisis. . .
- (2004). Out of Gas: The End of the Age of Oil. . .
- Amory B. Lovins (2004). Winning the Oil Endgame. Rocky Mountain Institute. 1881071103.
- (2003). Hubbert's Peak : The Impending World Oil Shortage. . .
- Vaclav Smil (2003). Energy at the Crossroads : Global Perspectives and Uncertainties. The MIT Press. 0262194929.
- Daniel Yergin (1991). The Prize: The Epic Quest for Oil, Money, and Power. Simon & Schuster. 0671502484.
- Harold F. Williamson and Arnold R. Daum (1959). The American Petroleum Industry: Volume I, The Age of Illumination. Northwestern University Press. .
- Harold F. Williamson, Ralph L. Andreano, Arnold R. Daum, and Gilbert C. Klose (1963). The American Petroleum Industry: Volume II, The Age of Energy. Northwestern University Press. .
Films about petroleum
- Burning of the Standard Oil Co.'s Tanks, Bayonne, N.J. at the Internet Movie Database
- California Oil Wells in Operation at the Internet Movie Database
- Canada Strikes Oil: Leduc, Alberta 1947 at the Internet Movie Database
- The End of Suburbia: Oil Depletion and the Collapse of the American Dream at the Internet Movie Database
- Hellfighters at the Internet Movie Database
- Incendio del pozo petrolero de Dos Bocas, Veracruz at the Internet Movie Database
- La Industria del Petróleo at the Internet Movie Database
- Industria petrolului at the Internet Movie Database
- Oil Fires, Their Prevention and Extinguishment at the Internet Movie Database
- Oil – From Fossil to Flame at the Internet Movie Database
- Roughnecks: The Story of Oil Drillers at the Internet Movie Database
- Wildcatter: The Story of Texas Oil at the Internet Movie Database