Petroleum

Pumpjack pumping an oil well near Lubbock, Texas

Petroleum (L. petroleum, from Greek: petra (rock) + Latin: oleum (oil)) or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. Petroleum is recovered mostly through oil drilling. This latter stage comes after the studies of structural geology (at the reservoir scale), sedimentary basin analysis, reservoir characterization (mainly in terms of porosity and permeable structures). It is refined and separated, most easily by boiling point, into a large number of consumer products, from petrol and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals. Petroleum is used in manufacturing a wide variety of materials.

The term petroleum was found (in the spelling "petraoleum") in tenth-century Old English sources. It was used in the treatise De Natura Fossilium, published in 1546 by the German mineralogist Georg Bauer, also known as Georgius Agricola. In the 19th Century, the term petroleum was frequently used to refer to mineral oils produced by distillation from mined organic solids such as cannel coal (and later oil shale), and refined oils produced from them; in the United Kingdom, storage (and later transport) of these oils were regulated by a series of Petroleum Acts, from the Petroleum Act 1862 c. 66 onward.

Proven world oil reserves, 2009

Composition

In its strictest sense, petroleum includes only crude oil, but in common usage it includes all liquid, gaseous, and solid (e.g., paraffin) hydrocarbons. Under surface pressure and temperature conditions, lighter hydrocarbons methane, ethane, propane and butane occur as gases, while pentane and heavier ones are in the form of liquids or solids. However, in an underground oil reservoir the proportions of gas, liquid, and solid depend on subsurface conditions and on the phase diagram of the petroleum mixture.

An oil well produces predominantly crude oil, with some natural gas dissolved in it. Because the pressure is lower at the surface than underground, some of the gas will come out of solution and be recovered (or burned) as associated gas or solution gas. A gas well produces predominantly natural gas. However, because the underground temperature and pressure are higher than at the surface, the gas may contain heavier hydrocarbons such as pentane, hexane, and heptane in the gaseous state. At surface conditions these will condense out of the gas to form natural gas condensate, often shortened to condensate. Condensate resembles petrol in appearance and is similar in composition to some volatile light crude oils.

The proportion of light hydrocarbons in the petroleum mixture varies greatly among different oil fields, ranging from as much as 97% by weight in the lighter oils to as little as 50% in the heavier oils and bitumens.

The hydrocarbons in crude oil are mostly alkanes, cycloalkanes and various aromatic hydrocarbons while the other organic compounds contain nitrogen, oxygen and sulfur, and trace amounts of metals such as iron, nickel, copper and vanadium. The exact molecular composition varies widely from formation to formation but the proportion of chemical elements vary over fairly narrow limits as follows:

Composition by weight

Element	Percent range
Carbon	83 to 87%
Hydrogen	10 to 14%
Nitrogen	0.1 to 2%
Oxygen	0.05 to 1.5%
Sulfur	0.05 to 6.0%
Metals	< 0.1%

Four different types of hydrocarbon molecules appear in crude oil. The relative percentage of each varies from oil to oil, determining the properties of each oil.

Composition by weight

Hydrocarbon	Average	Range
Paraffins	30%	15 to 60%
Naphthenes	49%	30 to 60%
Aromatics	15%	3 to 30%
Asphaltics	6%	remainder

Most of the world's oils are non-conventional.

Crude oil varies greatly in appearance depending on its composition. It is usually black or dark brown (although it may be yellowish, reddish, or even greenish). In the reservoir it is usually found in association with natural gas, which being lighter forms a gas cap over the petroleum, and saline water which, being heavier than most forms of crude oil, generally sinks beneath it. Crude oil may also be found in semi-solid form mixed with sand and water, as in the Athabasca oil sands in Canada, where it is usually referred to as crude bitumen. In Canada, bitumen is considered a sticky, black, tar-like form of crude oil which is so thick and heavy that it must be heated or diluted before it will flow. Venezuela also has large amounts of oil in the Orinoco oil sands, although the hydrocarbons trapped in them are more fluid than in Canada and are usually called extra heavy oil. These oil sands resources are called unconventional oil to distinguish them from oil which can be extracted using traditional oil well methods. Between them, Canada and Venezuela contain an estimated 3.6 trillion barrels (570×10^⁹ m³) of bitumen and extra-heavy oil, about twice the volume of the world's reserves of conventional oil.

Petroleum is used mostly, by volume, for producing fuel oil and petrol, both important "primary energy" sources. 84% by volume of the hydrocarbons present in petroleum is converted into energy-rich fuels (petroleum-based fuels), including petrol, diesel, jet, heating, and other fuel oils, and liquefied petroleum gas. The lighter grades of crude oil produce the best yields of these products, but as the world's reserves of light and medium oil are depleted, oil refineries are increasingly having to process heavy oil and bitumen, and use more complex and expensive methods to produce the products required. Because heavier crude oils have too much carbon and not enough hydrogen, these processes generally involve removing carbon from or adding hydrogen to the molecules, and using fluid catalytic cracking to convert the longer, more complex molecules in the oil to the shorter, simpler ones in the fuels.

Due to its high energy density, easy transportability and relative abundance, oil has become the world's most important source of energy since the mid-1950s. Petroleum is also the raw material for many chemical products, including pharmaceuticals, solvents, fertilizers, pesticides, and plastics; the 16% not used for energy production is converted into these other materials. Petroleum is found in porous rock formations in the upper strata of some areas of the Earth's crust. There is also petroleum in oil sands (tar sands). Known oil reserves are typically estimated at around 190 km³ (1.2 trillion (short scale) barrels) without oil sands, or 595 km³ (3.74 trillion barrels) with oil sands. Consumption is currently around 84 million barrels (13.4×10^⁶ m³) per day, or 4.9 km³ per year. Which in turn yields a remaining oil supply of only about 120 years, if current demand remain static.

Chemistry

Octane, a hydrocarbon found in petroleum. Lines represent single bonds; black spheres represent carbon; white spheres represent hydrogen.

Petroleum is a mixture of a very large number of different hydrocarbons; the most commonly found molecules are alkanes (linear or branched), cycloalkanes, aromatic hydrocarbons, or more complicated chemicals like asphaltenes. Each petroleum variety has a unique mix of molecules, which define its physical and chemical properties, like color and viscosity.

The alkanes, also known as paraffins, are saturated hydrocarbons with straight or branched chains which contain only carbon and hydrogen and have the general formula C_nH_2n+2. They generally have from 5 to 40 carbon atoms per molecule, although trace amounts of shorter or longer molecules may be present in the mixture.

The alkanes from pentane (C₅H₁₂) to octane (C₈H₁₈) are refined into petrol, the ones from nonane (C₉H₂₀) to hexadecane (C₁₆H₃₄) into diesel fuel, kerosene and jet fuel). Alkanes with more than 16 carbon atoms can be refined into fuel oil and lubricating oil. At the heavier end of the range, paraffin wax is an alkane with approximately 25 carbon atoms, while asphalt has 35 and up, although these are usually cracked by modern refineries into more valuable products. The shortest molecules, those with four or fewer carbon atoms, are in a gaseous state at room temperature. They are the petroleum gases. Depending on demand and the cost of recovery, these gases are either flared off, sold as liquified petroleum gas under pressure, or used to power the refinery's own burners. During the winter, Butane (C₄H₁₀), is blended into the petrol pool at high rates, because butane's high vapor pressure assists with cold starts. Liquified under pressure slightly above atmospheric, it is best known for powering cigarette lighters, but it is also a main fuel source for many developing countries. Propane can be liquified under modest pressure, and is consumed for just about every application relying on petroleum for energy, from cooking to heating to transportation.

The cycloalkanes, also known as naphthenes, are saturated hydrocarbons which have one or more carbon rings to which hydrogen atoms are attached according to the formula C_nH_2n. Cycloalkanes have similar properties to alkanes but have higher boiling points.

The aromatic hydrocarbons are unsaturated hydrocarbons which have one or more planar six-carbon rings called benzene rings, to which hydrogen atoms are attached with the formula C_nH_n. They tend to burn with a sooty flame, and many have a sweet aroma. Some are carcinogenic.

These different molecules are separated by fractional distillation at an oil refinery to produce petrol, jet fuel, kerosene, and other hydrocarbons. For example, 2,2,4-Trimethylpentane (isooctane), widely used in petrol, has a chemical formula of C₈H₁₈ and it reacts with oxygen exothermically:

2 C₈H₁₈(l) + 25 O₂(g) → 16 CO₂(g) + 18 H₂O(g) + 10.86 MJ/mol (of octane)

The amount of various molecules in an oil sample can be determined in laboratory. The molecules are typically extracted in a solvent, then separated in a gas chromatograph, and finally determined with a suitable detector, such as a flame ionization detector or a mass spectrometer. Due to the large number of co-eluted hydrocarbons within oil, many cannot be resolved by traditional gas chromatography and typically appear as a hump in the chromatogram. This unresolved complex mixture (UCM) of hydrocarbons is particularly apparent when analysing weathered oils and extracts from tissues of organisms exposed to oil.

Incomplete combustion of petroleum or petrol results in production of toxic byproducts. Too little oxygen results in carbon monoxide. Due to the high temperatures and high pressures involved, exhaust gases from petrol combustion in car engines usually include nitrogen oxides which are responsible for creation of photochemical smog.

Empirical equations for the thermal properties of petroleum products

Heat of combustion

At a constant volume the heat of combustion of a petroleum product can be approximated as follows:

Q_v = 12,400 - 2,100d^2

where Q_v is measured in cal/gram and d is the specific gravity at 60 °F (16 °C).

Thermal conductivity

The thermal conductivity of petroleum based liquids can be modeled as follows:

where K is measured in BTU · hr⁻¹ft⁻² , t is measured in °F and d is the specific gravity at 60 °F (16 °C).

Specific heat

The specific heat of a petroleum oils can be modeled as follows:

where c is measured in BTU/lbm-°F, t is the temperature in Fahrenheit and d is the specific gravity at 60 °F (16 °C).

In units of kcal/(kg·°C), the formula is:

where the temperature t is in Celsius and d is the specific gravity at 15 °C.

Latent heat of vaporization

The latent heat of vaporization can be modeled under atmospheric conditions as follows:

where L is measured in BTU/lbm, t is measured in °F and d is the specific gravity at 60 °F (16 °C).

In units of kcal/kg, the formula is:

where the temperature t is in Celsius and d is the specific gravity at 15 °C.

Formation

Structure of vanadium porphyrin compound extracted from petroleum by Alfred E. Treibs, father of organic geochemistry. Treibs noted the close structural similarity of this molecule and chlorophyll a.

Petroleum is a fossil fuel derived from ancient fossilized organic materials, such as zooplankton and algae. Vast quantities of these remains settled to a sea or lake bottoms, mixing with sediments and being buried under anoxic conditions. As further layers settled to the sea or lake bed, intense heat and pressure built up in the lower regions. This process caused the organic matter to change, first into a waxy material known as kerogen, which is found in various oil shales around the world, and then with more heat into liquid and gaseous hydrocarbons via a process known as catagenesis. Formation of petroleum occurs from hydrocarbon pyrolysis in a variety of mostly endothermic reactions at high temperature and/or pressure.

There were certain warm nutrient-rich environments such as the Gulf of Mexico and the ancient Tethys Sea where the large amounts of organic material falling to the ocean floor exceeded the rate at which it could decompose. This resulted in large masses of organic material being buried under subsequent deposits such as shale formed from mud. This massive organic deposit later became heated and transformed under pressure into oil.

Geologists often refer to the temperature range in which oil forms as an "oil window"—below the minimum temperature oil remains trapped in the form of kerogen, and above the maximum temperature the oil is converted to natural gas through the process of thermal cracking. Sometimes, oil formed at extreme depths may migrate and become trapped at a much shallower level. The Athabasca Oil Sands is one example of this.

Abiogenic origin hypothesis

Main article: Abiogenic petroleum origin

A small number of geologists adhere to the abiogenic petroleum origin hypothesis, maintaining that high molecular weight hydrocarbons of purely inorganic origin exist within Earth's interior and are the source for major petroleum deposits. The hypothesis was originally proposed by Nikolai Kudryavtsev and Vladimir Porfiriev in the 1950s, and more recently Thomas Gold proposed a similar deep hot biosphere idea. The thermodynamic synthesis routes necessary to carry abiogenic source material into subsurface oil are not established, observation of organic markers in kerogen and oil is not explained, and no oil deposits have been located by this hypothesis.

Crude oil

Crude oil reservoirs

Hydrocarbon trap

Three conditions must be present for oil reservoirs to form: a source rock rich in hydrocarbon material buried deep enough for subterranean heat to cook it into oil; a porous and permeable reservoir rock for it to accumulate in; and a cap rock (seal) or other mechanism that prevents it from escaping to the surface. Within these reservoirs, fluids will typically organize themselves like a three-layer cake with a layer of water below the oil layer and a layer of gas above it, although the different layers vary in size between reservoirs. Because most hydrocarbons are lighter than rock or water, they often migrate upward through adjacent rock layers until either reaching the surface or becoming trapped within porous rocks (known as reservoirs) by impermeable rocks above. However, the process is influenced by underground water flows, causing oil to migrate hundreds of kilometres horizontally or even short distances downward before becoming trapped in a reservoir. When hydrocarbons are concentrated in a trap, an oil field forms, from which the liquid can be extracted by drilling and pumping.

The reactions that produce oil and natural gas are often modeled as first order breakdown reactions, where hydrocarbons are broken down to oil and natural gas by a set of parallel reactions, and oil eventually breaks down to natural gas by another set of reactions. The latter set is regularly used in petrochemical plants and oil refineries.

Wells are drilled into oil reservoirs to extract the crude oil. "Natural lift" production methods that rely on the natural reservoir pressure to force the oil to the surface are usually sufficient for a while after reservoirs are first tapped. In some reservoirs, such as in the Middle East, the natural pressure is sufficient over a long time. The natural pressure in many reservoirs, however, eventually dissipates. Then the oil must be pumped out using “artificial lift” created by mechanical pumps powered by gas or electricity. Over time, these "primary" methods become less effective and "secondary" production methods may be used. A common secondary method is “waterflood” or injection of water into the reservoir to increase pressure and force the oil to the drilled shaft or "wellbore." Eventually "tertiary" or "enhanced" oil recovery methods may be used to increase the oil's flow characteristics by injecting steam, carbon dioxide and other gases or chemicals into the reservoir. In the United States, primary production methods account for less than 40% of the oil produced on a daily basis, secondary methods account for about half, and tertiary recovery the remaining 10%. Extracting oil (or “bitumen”) from oil/tar sand and oil shale deposits requires mining the sand or shale and heating it in a vessel or retort, or using “in-situ” methods of injecting heated liquids into the deposit and then pumping out the oil-saturated liquid.

Unconventional oil reservoirs

See also: Unconventional oil, Oil sands, and Oil shale reserves

Oil-eating bacteria biodegrade oil that has escaped to the surface. Oil sands are reservoirs of partially biodegraded oil still in the process of escaping and being biodegraded, but they contain so much migrating oil that, although most of it has escaped, vast amounts are still present—more than can be found in conventional oil reservoirs. The lighter fractions of the crude oil are destroyed first, resulting in reservoirs containing an extremely heavy form of crude oil, called crude bitumen in Canada, or extra-heavy crude oil in Venezuela. These two countries have the world's largest deposits of oil sands.

On the other hand, oil shales are source rocks that have not been exposed to heat or pressure long enough to convert their trapped hydrocarbons into crude oil. Technically speaking, oil shales are not always shales and do not contain oil, but are fined-grain sedimentary rocks containing an insoluble organic solid called kerogen. The kerogen in the rock can be converted into crude oil using heat and pressure to simulate natural processes. The method has been known for centuries and was patented in 1694 under British Crown Patent No. 330 covering, "A way to extract and make great quantityes of pitch, tarr, and oyle out of a sort of stone." Although oil shales are found in many countries, the United States has the world's largest deposits.

Classification

See also: Benchmark (crude oil)

A sample of medium heavy crude oil

The petroleum industry generally classifies crude oil by the geographic location it is produced in (e.g. West Texas Intermediate, Brent, or Oman), its API gravity (an oil industry measure of density), and its sulfur content. Crude oil may be considered light if it has low density or heavy if it has high density; and it may be referred to as sweet if it contains relatively little sulfur or sour if it contains substantial amounts of sulfur.

The geographic location is important because it affects transportation costs to the refinery. Light crude oil is more desirable than heavy oil since it produces a higher yield of petrol, while sweet oil commands a higher price than sour oil because it has fewer environmental problems and requires less refining to meet sulfur standards imposed on fuels in consuming countries. Each crude oil has unique molecular characteristics which are understood by the use of crude oil assay analysis in petroleum laboratories.

Barrels from an area in which the crude oil's molecular characteristics have been determined and the oil has been classified are used as pricing references throughout the world. Some of the common reference crudes are:

• West Texas Intermediate (WTI), a very high-quality, sweet, light oil delivered at Cushing, Oklahoma for North American oil
• 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 Shetland. Oil production from Europe, Africa and Middle Eastern oil flowing West tends to be priced off this oil, which forms a benchmark
• Dubai-Oman, used as benchmark for Middle East sour crude oil flowing to the Asia-Pacific region
• 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 Reference Basket, a weighted average of oil blends from various OPEC (The Organization of the Petroleum Exporting Countries) countries
• Midway Sunset Heavy, by which heavy oil in California is priced

There are declining amounts of these benchmark oils being produced each year, so other oils are more commonly what is actually delivered. While the reference price may be for West Texas Intermediate delivered at Cushing, the actual oil being traded may be a discounted Canadian heavy oil delivered at Hardisty, Alberta, and for a Brent Blend delivered at Shetland, it may be a Russian Export Blend delivered at the port of Primorsk.

Petroleum industry

New York Mercantile Exchange prices for West Texas Intermediate 1996–2009

Main article: Petroleum industry

The petroleum industry is involved in the global processes of exploration, extraction, refining, transporting (often with oil tankers and pipelines), and marketing petroleum products. The largest volume products of the industry are fuel oil and petrol . Petroleum is also the raw material for many chemical products, including pharmaceuticals, solvents, fertilizers, pesticides, and plastics. The industry is usually divided into three major components: upstream, midstream and downstream. Midstream operations are usually included in the downstream category.

Petroleum is vital to many industries, and is of importance to the maintenance of industrialized civilization itself, and thus is critical concern to many nations. Oil accounts for a large percentage of the world's energy consumption, ranging from a low of 32% for Europe and Asia, up to a high of 53% for the Middle East. Other geographic regions' consumption patterns are as follows: South and Central America (44%), Africa (41%), and North America (40%). The world at large consumes 30 billion barrels (4.8 km³) of oil per year, and the top oil consumers largely consist of developed nations. In fact, 24% of the oil consumed in 2004 went to the United States alone, though by 2007 this had dropped to 21% of world oil consumed.

In the US, in the states of Arizona, California, Hawaii, Nevada, Oregon and Washington, the Western States Petroleum Association (WSPA) represents companies responsible for producing, distributing, refining, transporting and marketing petroleum. This non-profit trade association was founded in 1907, and is the oldest petroleum trade association in the United States.

History

Main article: History of petroleum

Oil derrick in Okemah, Oklahoma, 1922.

Petroleum, in one form or another, has been used since ancient times, and is now important across society, including in economy, politics and technology. The rise in importance was mostly due to the invention of the internal combustion engine, the rise in commercial aviation and the increasing use of plastic.

More than 4000 years ago, according to Herodotus and Diodorus Siculus, asphalt was used in the construction of the walls and towers of Babylon; there were oil pits near Ardericca (near Babylon), and a pitch spring on Zacynthus. Great quantities of it were found on the banks of the river Issus, one of the tributaries of the Euphrates. Ancient Persian tablets indicate the medicinal and lighting uses of petroleum in the upper levels of their society. By 347 CE, oil was produced from bamboo-drilled wells in China.

In the 1850s, the process to distill kerosene from petroleum was invented by Ignacy Łukasiewicz, providing a cheaper alternative to whale oil. The demand for the petroleum as a fuel for lighting in North America and around the world quickly grew. The world's first commercial oil well was drilled in Poland in 1853. Oil exploration developed in many parts of the world with the Russian Empire, particularly the Branobel company in Azerbaijan (Asia's first modern borehole oil production began in 1848 at the Bibi-Heybat field near Baku), taking the lead in production by the end of the 19th century.

Access to oil was and still is a major factor in several military conflicts of the twentieth century, including World War II, during which oil facilities were a major strategic asset and were extensively bombed. Operation Barbarossa included the goal to capture the Baku oilfields, as it would provide much needed oil-supplies for the German military which was suffering from blockades. Oil exploration in North America during the early 20th century later led to the U.S. becoming the leading producer by the mid 1900s. As petroleum production in the U.S. peaked during the 1960s, however, the United States was surpassed by Saudi Arabia and Russia.

Today, about 90% of vehicular fuel needs are met by oil. Petroleum also makes up 40% of total energy consumption in the United States, but is responsible for only 1% of electricity generation. 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. Viability of the oil commodity is controlled by several key parameters, number of vehicles in the world competing for fuel, quantity of oil exported to the world market (Export Land Model), Net Energy Gain (energy consumed to provide economically useful energy), political stability of oil exporting nations and ability to defend oil supply lines.

The top three oil producing countries are Saudi Arabia, Russia, and the United States. About 80% of the world's readily accessible reserves are located in the Middle East, with 62.5% coming from the Arab 5: Saudi Arabia, UAE, Iraq, Qatar and Kuwait. A large portion of the world's total oil exists as unconventional sources, such as bitumen in Canada and Venezuela and oil shale. While significant volumes of oil are extracted from oil sands, particularly in Canada, logistical and technical hurdles remain, as oil extraction requires large amounts of heat and water, making its net energy content quite low relative to conventional crude oil. Thus, Canada's oil sands are not expected to provide more than a few million barrels per day in the foreseeable future. Net Energy Gain from oil sands and shale are less than 5.

Conventional crude oil production, those having Net Energy Gain above 10 stopped growing in 2005 at about 74 million barrels per day. The International Energy Agency's (IEA) 2010 World Energy Outlook estimated that conventional crude oil production has peaked and is depleting at 6.8% per year. US military's Joint Forces Command's Joint Operating Environment 2010 issued this warning to all US military commands "By 2012, surplus oil production capacity could entirely disappear, and as early as 2015, the shortfall in output could reach nearly 10 million barrels per day."

Price

Main article: Price of petroleum

After the collapse of the OPEC-administered pricing system in 1985, and a short lived experiment with netback pricing, oil-exporting countries adopted a market-linked pricing mechanism. First adopted by PEMEX in 1986, market-linked pricing was widely accepted, and by 1988 became and still is the main method for pricing crude oil in international trade. The current reference, or pricing markers, are Brent, WTI, and Dubai/Oman.

Uses

Further information: Petroleum products

The chemical structure of petroleum is heterogeneous, composed of hydrocarbon chains of different lengths. Because of this, petroleum may be taken to oil refineries and the hydrocarbon chemicals separated by distillation and treated by other chemical processes, to be used for a variety of purposes. See Petroleum products.

Fuels

The most common distillation fractions of petroleum are fuels. Fuels include (by increasing boiling temperature range):

Common fractions of petroleum as fuels

Fraction	Boiling Range oC
Liquefied petroleum gas (LPG)	-40
Butane	-12 to -1
Gasoline (Petrol)	-1 to 180
Jet fuel	150 to 205
Kerosene	205 to 260
Fuel oil	205 to 290
Diesel fuel	260 to 315

Other derivatives

Certain types of resultant hydrocarbons may be mixed with other non-hydrocarbons, to create other end products:

• Alkenes (olefins) which can be manufactured into plastics or other compounds
• Lubricants (produces light machine oils, motor oils, and greases, adding viscosity stabilizers as required).
• Wax, used in the packaging of frozen foods, among others.
• Sulfur or Sulfuric acid. These are a useful industrial materials. Sulfuric acid is usually prepared as the acid precursor oleum, a byproduct of sulfur removal from fuels.
• Bulk tar.
• Asphalt
• Petroleum coke, used in speciality carbon products or as solid fuel.
• Paraffin wax
• Aromatic petrochemicals to be used as precursors in other chemical production.

Agriculture

Since the 1940s, agricultural productivity has increased dramatically, due largely to the increased use of energy-intensive mechanization, fertilizers and pesticides. Nearly all pesticides and many fertilizers are made from oil.

Petroleum by country

Consumption statistics

• 

  Global fossil carbon emissions, an indicator of consumption, for 1800–2007. Total is black, Oil is in blue.

• 

  EIA Primary Energy Outlook (retrieved on 2011-06)

• 

  daily oil consumption from 1980 to 2006

• 

  oil consumption by percentage of total per region from 1980 to 2006: red=USA, blue=Europe, yellow=Asia+Oceania

Consumption

Oil consumption per capita (darker colors represent more consumption).

This table orders the amount of petroleum consumed in 2008 in thousand barrels (bbl) per day and in thousand cubic metres (m³) per day:

Consuming Nation 2008	(1000 bbl/day)	(1000 m3/day)	population in millions	bbl/year per capita
United States 1	19,497.95	3,099.9	314	22.6
China	7,831.00	1,245.0	1345	2.1
Japan 2	4,784.85	760.7	127	13.7
India 2	2,962.00	470.9	1198	0.9
Russia 1	2,916.00	463.6	140	7.6
Germany 2	2,569.28	408.5	82	11.4
Brazil	2,485.00	395.1	193	4.7
Saudi Arabia (OPEC)	2,376.00	377.8	25	33.7
Canada	2,261.36	359.5	33	24.6
South Korea 2	2,174.91	345.8	48	16.4
Mexico 1	2,128.46	338.4	109	7.1
France 2	1,986.26	315.8	62	11.6
Iran (OPEC)	1,741.00	276.8	74	8.6
United Kingdom 1	1,709.66	271.8	61	10.1
Italy 2	1,639.01	260.6	60	10

Source: US Energy Information Administration

Population Data:

¹ peak production of oil already passed in this state

² This country is not a major oil producer

Production

For oil reserves by country, see Oil reserves#Proven reserves in order.

Oil producing countries

Graph of Top Oil Producing Countries 1960–2006, including Soviet Union

In petroleum industry parlance, production refers to the quantity of crude extracted from reserves, not the literal creation of the product.

#	Producing Nation	103bbl/d (2006)	103bbl/d (2007)	103bbl/d (2008)	103bbl/d (2009)	Present Share
1	Saudi Arabia (OPEC)	10,665	10,234	10,782	9,760	11.8%
2	Russia 1	9,677	9,876	9,789	9,934	12.0%
3	United States 1	8,331	8,481	8,514	9,141	11.1%
4	Iran (OPEC)	4,148	4,043	4,174	4,177	5.1%
5	China	3,845	3,901	3,973	3,996	4.8%
6	Canada 2	3,288	3,358	3,350	3,294	4.0%
7	Mexico 1	3,707	3,501	3,185	3,001	3.6%
8	United Arab Emirates (OPEC)	2,945	2,948	3,046	2,795	3.4%
9	Kuwait (OPEC)	2,675	2,613	2,742	2,496	3.0%
10	Venezuela (OPEC) 1	2,803	2,667	2,643	2,471	3.0%
11	Norway 1	2,786	2,565	2,466	2,350	2.8%
12	Brazil	2,166	2,279	2,401	2,577	3.1%
13	Iraq (OPEC) 3	2,008	2,094	2,385	2,400	2.9%
14	Algeria (OPEC)	2,122	2,173	2,179	2,126	2.6%
15	Nigeria (OPEC)	2,443	2,352	2,169	2,211	2.7%
16	Angola (OPEC)	1,435	1,769	2,014	1,948	2.4%
17	Libya (OPEC)	1,809	1,845	1,875	1,789	2.2%
18	United Kingdom	1,689	1,690	1,584	1,422	1.7%
19	Kazakhstan	1,388	1,445	1,429	1,540	1.9%
20	Qatar (OPEC)	1,141	1,136	1,207	1,213	1.5%
21	Indonesia	1,102	1,044	1,051	1,023	1.2%
22	India	854	881	884	877	1.1%
23	Azerbaijan	648	850	875	1,012	1.2%
24	Argentina	802	791	792	794	1.0%
25	Oman	743	714	761	816	1.0%
26	Malaysia	729	703	727	693	0.8%
27	Egypt	667	664	631	678	0.8%
28	Colombia	544	543	601	686	0.8%
29	Australia	552	595	586	588	0.7%
30	Ecuador (OPEC)	536	512	505	485	0.6%
31	Sudan	380	466	480	486	0.6%
32	Syria	449	446	426	400	0.5%
33	Equatorial Guinea	386	400	359	346	0.4%
34	Thailand	334	349	361	339	0.4%
35	Vietnam	362	352	314	346	0.4%
36	Yemen	377	361	300	287	0.3%
37	Denmark	344	314	289	262	0.3%
38	Gabon	237	244	248	242	0.3%
39	South Africa	204	199	195	192	0.2%
40	Turkmenistan	No data	180	189	198	0.2%

Source: U.S. Energy Information Administration

¹ Peak production of conventional oil already passed in this state

² Although Canadian conventional oil production is declining, total oil production is increasing as oil sands production grows. If oil sands are included, it has the world's second largest oil reserves after Saudi Arabia.

³ Though still a member, Iraq has not been included in production figures since 1998

Export

See also: Fossil fuel exporters and Organization of Petroleum Exporting Countries

Oil exports by country.

In order of net exports in 2006 in thousand bbl/d and thousand m³/d:

#	Exporting Nation (2006)	(103bbl/d)	(103m3/d)
1	Saudi Arabia (OPEC)	8,651	1,376
2	Russia 1	6,565	1,044
3	Norway 1	2,542	404
4	Iran (OPEC)	2,519	401
5	United Arab Emirates (OPEC)	2,515	400
6	Venezuela (OPEC) 1	2,203	350
7	Kuwait (OPEC)	2,150	342
8	Nigeria (OPEC)	2,146	341
9	Algeria (OPEC) 1	1,847	297
10	Mexico 1	1,676	266
11	Libya (OPEC) 1	1,525	242
12	Iraq (OPEC)	1,438	229
13	Angola (OPEC)	1,363	217
14	Kazakhstan	1,114	177
15	Canada 2	1,071	170

Source: US Energy Information Administration

¹ peak production already passed in this state

² Canadian statistics are complicated by the fact it is both an importer and exporter of crude oil, and refines large amounts of oil for the U.S. market. It is the leading source of U.S. imports of oil and products, averaging 2,500,000 bbl/d (400,000 m³/d) in August 2007. [2].

Total world production/consumption (as of 2005) is approximately 84 million barrels per day (13,400,000 m³/d).

Import

Oil imports by country.

In order of net imports in 2006 in thousand bbl/d and thousand m³/d:

#	Importing Nation (2006)	(103bbl/day)	(103m3/day)
1	United States 1	12,220	1,943
2	Japan	5,097	810
3	China 2	3,438	547
4	Germany	2,483	395
5	South Korea	2,150	342
6	France	1,893	301
7	India	1,687	268
8	Italy	1,558	248
9	Spain	1,555	247
10	Republic of China (Taiwan)	942	150
11	Netherlands	936	149
12	Singapore	787	125
13	Thailand	606	96
14	Turkey	576	92
15	Belgium	546	87

Source: US Energy Information Administration

¹ peak production of oil already passed in this state^{[citation needed]}

² Major oil producer whose production is still increasing^{[citation needed]}

Non-producing consumers

Countries whose oil production is 10% or less of their consumption.

#	Consuming Nation	(bbl/day)	(m³/day)
1	Japan	5,578,000	886,831
2	Germany	2,677,000	425,609
3	South Korea	2,061,000	327,673
4	France	2,060,000	327,514
5	Italy	1,874,000	297,942
6	Spain	1,537,000	244,363
7	Netherlands	946,700	150,513
8	Turkey	575,011	91,663

Source: CIA World Factbook

Environmental effects

Diesel fuel spill on a road

Main article: Environmental issues with petroleum

Because petroleum is a naturally occurring substance, its presence in the environment need not be the result of human causes such as accidents and routine activities ( seismic exploration, drilling, extraction, refining and combustion). Phenomena such as seeps and tar pits are examples of areas that petroleum naturally affects. Regardless of source, petroleum's effects when released into the environment are similar.

Global warming

When burned, petroleum releases carbon dioxide; a greenhouse gas. Along with the burning of coal, petroleum combustion is the largest contributor to the increase in atmospheric CO₂. Atmospheric CO₂ has risen steadily since the industrial revolution to current levels of over 380ppmv, from the 180 - 300ppmv of the prior 800 thousand years, driving global warming.

Extraction

Oil extraction is simply the removal of oil from the reservoir (oil pool). Oil is often recovered as a water-in-oil emulsion, and specialty chemicals called demulsifiers are used to separate the oil from water. Oil extraction is costly and sometimes environmentally damaging, although Dr. John Hunt of the Woods Hole Oceanographic Institution 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 seeps. Offshore exploration and extraction of oil disturbs the surrounding marine environment.

Oil spills

Main article: Oil spill

Volunteers cleaning up the aftermath of the Prestige oil spill

Crude oil and refined fuel spills from tanker ship accidents have damaged natural ecosystems in Alaska, the Gulf of Mexico, the Galapagos Islands, France and many other places.

The quantity of oil spilled during accidents has ranged from a few hundred tons to several hundred thousand tons (e.g., Deepwater Horizon Oil Spill, Atlantic Empress, Amoco Cadiz). Smaller spills have already proven to have a great impact on ecosystems, such as the Exxon Valdez oil spill

Oil spills at sea are generally much more damaging than those on land, since they can spread for hundreds of nautical miles in a thin oil slick which can cover beaches with a thin coating of oil. This can kill sea birds, mammals, shellfish and other organisms it coats. Oil spills on land are more readily containable if a makeshift earth dam can be rapidly bulldozed around the spill site before most of the oil escapes, and land animals can avoid the oil more easily.

Control of oil spills is difficult, requires ad hoc methods, and often a large amount of manpower. The dropping of bombs and incendiary devices from aircraft on the Torrey Canyon wreck produced poor results; modern techniques would include pumping the oil from the wreck, like in the Prestige oil spill or the Erika oil spill.

Though crude oil is predominantly composed of various hydrocarbons, certain nitrogen heterocylic compounds, such as pyridine, picoline, and quinoline are reported as contaminants associated with crude oil, as well as facilities processing oil shale or coal, and have also been found at legacy wood treatment sites. These compounds have a very high water solubility, and thus tend to dissolve and move with water. Certain naturally occurring bacteria, such as Micrococcus, Arthrobacter, and Rhodococcus and have been shown to degrade these contaminants.

Tarballs

A tarball is a blob of oil (not to be confused with tar, which is typically derived from pine trees rather than petroleum) which has been weathered after floating in the ocean. Tarballs are an aquatic pollutant in most environments, although they can occur naturally, for example, in the Santa Barbara Channel of California. Their concentration and features have been used to assess the extent of oil spills. Their composition can be used to identify their sources of origin, and tarballs themselves may be dispersed over long distances by deep sea currents. They are slowly decomposed by bacteria, including Chromobacterium violaceum, Cladosporium resinae, Bacillus submarinus, Micrococcus varians, Pseudomonas aeruginosa, Candida marina and Saccharomyces estuari.

Whales

James S. Robbins has argued that the advent of petroleum-refined kerosene saved some species of great whales from extinction by providing an inexpensive substitute for whale oil, thus eliminating the economic imperative for open-boat whaling.

Alternatives to petroleum

Further information: Renewable energy

In the United States in 2007 about 70% of petroleum was used for transportation (e.g. petrol, diesel, jet fuel), 24% by industry (e.g. production of plastics), 5% for residential and commercial uses, and 2% for electricity production. Outside of the US, a higher proportion of petroleum tends to be used for electricity.

Alternatives to petroleum-based vehicle fuels

Typical Brazilian fuel station with four alternative fuels for sale: biodiesel (B3), gasohol (E25), neat ethanol (E100), and compressed natural gas (CNG).

Main articles: Alternative fuel vehicle, Hydrogen economy, and Green vehicle

Alternative fuel vehicles refers to both:

• vehicles that use alternative fuels used in standard or modified internal combustion engines such as natural gas vehicles, neat ethanol vehicles, flexible-fuel vehicles, biodiesel-powered vehicles, and hydrogen vehicles.
• vehicles with advanced propulsion systems that reduce or substitute petroleum use such as battery electric vehicles, plug-in hybrid electric vehicles, hybrid electric vehicles, and hydrogen fuel cell vehicles.

Alternatives to using oil in industry

Biological feedstocks do exist for industrial uses such as plastic production.

Alternatives to burning petroleum for electricity

Main articles: Alternative energy, Nuclear power, and Renewable energy

In oil producing countries with little refinery capacity, oil is sometimes burned to produce electricity. Renewable energy technologies such as solar power, wind power, micro hydro, biomass and biofuels might someday be used to replace some of these generators, but today the primary alternatives remain large scale hydroelectricity, nuclear and coal-fired generation.

Future of petroleum production

Consumption in the twentieth and twenty-first centuries has been abundantly pushed by automobile growth; the 1985-2003 oil glut even fuelled the sales of low economy vehicles in OECD countries. In 2008, the economic crisis seems to have some impact on the sales of such vehicles; still, the 2008 oil consumption shows a small increase. The BRIC countries might also kick in, as China briefly was the first automobile market in December 2009. The immediate outlook still hints upwards. In the long term, uncertainties linger; the OPEC believes that the OECD countries will push low consumption policies at some point in the future; when that happens, it will definitely curb the oil sales, and both OPEC and EIA kept lowering their 2020 consumption estimates during the past 5 years. Oil products are more and more in competition with alternative sources, mainly coal and natural gas, both cheaper sources.

Production will also face an increasingly complex situation; while OPEC countries still have large reserves at low production prices, newly found reservoirs often lead to higher prices; offshore giants such as Tupi, Guara and Tiber demand high investments and ever-increasing technological abilities. Subsalt reservoirs such as Tupi were unknown in the twentieth century, mainly because the industry was unable to probe them. Enhanced Oil Recovery (EOR) techniques (example: DaQing, China ) will continue to play a major role in increasing the world's recoverable oil.

Hubbert peak theory

Main articles: Peak oil and Hubbert peak theory

The Hubbert peak theory (also known as peak oil) posits that future petroleum production (whether for individual oil wells, entire oil fields, whole countries, or worldwide production) will eventually peak and then decline at a similar rate to the rate of increase before the peak as these reserves are exhausted. The peak of oil discoveries was in 1965, and oil production per year has surpassed oil discoveries every year since 1980.

Hubbert applied his theory to predict the peak of U.S. oil production at a date between 1966 and 1970. This prediction was based on data available at the time of his publication in 1956. In the same paper, Hubbert predicts world peak oil in "half a century" after his publication, which would be 2006.

It is difficult to predict the oil peak in any given region, due to the lack of knowledge and/or transparency in accounting of global oil reserves. The scientist and researchers from Oxford University argue that official figures are inflated because OPEC members over-reported reserves in the 1980s when competing for global market share. Based on available production data, proponents have previously predicted the peak for the world to be in years 1989, 1995, or 1995-2000. Some of these predictions date from before the recession of the early 1980s, and the consequent reduction in global consumption, the effect of which was to delay the date of any peak by several years. Just as the 1971 U.S. peak in oil production was only clearly recognized after the fact, a peak in world production will be difficult to discern until production clearly drops off.

The International Energy Agency (IEA) says production of conventional crude oil peaked in 2006. Since virtually all economic sectors rely heavily on petroleum, peak oil could lead to a "partial or complete failure of markets."

See also

• Barrel of oil equivalent
• Gas oil ratio
• List of countries by proven oil reserves
• List of oil fields
• List of petroleum companies
• Manure-derived synthetic crude oil
• Oil burden
• Petroleum geology
• Thermal depolymerization
• Waste oil

References

• translated 1955

External links

• Petroleum at the Open Directory Project
• Petroleum Online e-Learning resource from IHRDC
• U.S. Energy Information Administration
  • U.S. Department of Energy EIA – World supply and consumption
  • Who are the major players supplying the world oil market?
• American Petroleum Institute – the trade association of the US oil industry.
• Oil survey – OECD International Energy Agency
• Oil volume-weight and price converter
• Oil and Gas Industry Learning Center – information on oil and gas processes
• U.S. National Library of Medicine: Hazardous Substances Databank – Crude Oil