Petroleum - Wikipedia Petroleum `` Crude oil '' redirects here. For the 2008 film, see Crude Oil ( film ). For the fuel `` petrol '', see Gasoline. For other uses, see Petroleum ( disambiguation ). This article needs to be updated. Please update this article to reflect recent events or newly available information. ( October 2017 ) Proven world oil reserves, 2013. Unconventional reservoirs such as natural heavy oil and oil sands are included. Pumpjack pumping an oil well near Lubbock, Texas An oil refinery in Mina - Al - Ahmadi, Kuwait Natural petroleum spring in Korňa, Slovakia Petroleum ( from Latin : petra : `` rock '' + oleum : `` oil ''. ) is a naturally occurring, yellow - to - black liquid found in geological formations beneath the Earth 's surface. It is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation i.e separation of a liquid mixture into fractions differing in boiling point by means of distillation, typically using a fractionating column. It consists of hydrocarbons of various molecular weights and other organic compounds. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure. Petroleum has mostly been recovered by oil drilling ( natural petroleum springs are rare ). Drilling is carried out after studies of structural geology ( at the reservoir scale ), sedimentary basin analysis, and reservoir characterization ( mainly in terms of the porosity and permeability of geologic reservoir structures ) have been completed. It is refined and separated, most easily by distillation, into a large number of consumer products, from gasoline ( petrol ) and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals. Petroleum is used in manufacturing a wide variety of materials, and it is estimated that the world consumes about 95 million barrels each day. Concern over the depletion of the earth 's finite reserves of oil, and the effect this would have on a society dependent on it, is a concept known as peak oil. The use of fossil fuels, such as petroleum, has a negative impact on Earth 's biosphere, damaging ecosystems through events such as oil spills and releasing a range of pollutants into the air including ground - level ozone and sulfur dioxide from sulfur impurities in fossil fuels. The burning of fossil fuels plays a major role in the current episode of global warming. Contents 1 Etymology 2 History 2.1 Early history 2.2 Modern history 3 Composition 4 Chemistry 5 Empirical equations for thermal properties 5.1 Heat of combustion 5.2 Thermal conductivity 5.3 Specific heat 5.4 Latent heat of vaporization 6 Formation 7 Reservoirs 7.1 Crude oil reservoirs 7.2 Unconventional oil reservoirs 8 Classification 9 Petroleum industry 9.1 Shipping 10 Price 11 Uses 11.1 Fuels 11.2 Other derivatives 11.3 Agriculture 12 Petroleum by country 12.1 Consumption statistics 12.2 Consumption 12.3 Production 12.4 Export 12.5 Import 12.6 Oil Imports to the USA by country 2010 12.7 Non-producing consumers 13 Environmental effects 13.1 Ocean acidification 13.2 Global warming 13.3 Extraction 13.4 Oil spills 13.5 Tarballs 13.6 Whales 14 Alternatives to petroleum 14.1 Alternatives to petroleum - based vehicle fuels 14.2 Alternatives to using oil in industry 14.3 Alternatives to burning petroleum for electricity 15 Future of petroleum production 15.1 Peak oil 15.2 Unconventional production 16 See also 17 Notes 18 References 19 Further reading 20 External links Etymology Fractional distillation apparatus The word petroleum comes from Greek : πέτρα ( petra ) for rocks and Greek : ἔλαιον ( elaion ) for oil. The term was found ( in the spelling `` petraoleum '' ) in 10th - 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 often 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 1863 onwards. History Main article : History of the petroleum industry Early History 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 due to the invention of the internal combustion engine, the rise in commercial aviation, and the importance of petroleum to industrial organic chemistry, particularly the synthesis of plastics, fertilizers, solvents, adhesives and pesticides. 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. The use of petroleum dates back to ancient China more than 2000 years ago. In I Ching, one of the earliest Chinese writings cites the use of oil in its raw state without refining was first discovered, extracted, and used in China in the first century BCE. In addition, the Chinese were the first to use petroleum as fuel as the early as the fourth century BCE. By 347 AD, oil was produced from bamboo - drilled wells in China. Early British explorers to Myanmar documented a flourishing oil extraction industry based in Yenangyaung that, in 1795, had hundreds of hand - dug wells under production. The mythological origins of the oil fields at Yenangyaung, and its hereditary monopoly control by 24 families, indicate very ancient origins. Pechelbronn ( Pitch fountain ) is said to be the first European site where petroleum has been explored and used. The still active Erdpechquelle, a spring where petroleum appears mixed with water has been used since 1498, e.g. for medical purposes. Oil sands have been mined since the 18th century. In Wietze in lower Saxony, natural asphalt / bitumen has been explored since the 18th century. Both in Pechelbronn as in Wietze, the coal industry dominated the petroleum technologies. Modern History Scottish chemist James Young noticed a natural petroleum seepage in the Riddings colliery at Alfreton, Derbyshire from which he distilled a light thin oil suitable for use as lamp oil, at the same time obtaining a thicker oil suitable for lubricating machinery. In 1848 Young set up a small business refining the crude oil. Young eventually succeeded, by distilling cannel coal at a low heat, in creating a fluid resembling petroleum, which when treated in the same way as the seep oil gave similar products. Young found that by slow distillation he could obtain a number of useful liquids from it, one of which he named `` paraffine oil '' because at low temperatures it congealed into a substance resembling paraffin wax. The production of these oils and solid paraffin wax from coal formed the subject of his patent dated 17 October 1850. In 1850 Young & Meldrum and Edward William Binney entered into partnership under the title of E.W. Binney & Co. at Bathgate in West Lothian and E. Meldrum & Co. at Glasgow ; their works at Bathgate were completed in 1851 and became the first truly commercial oil - works in the world with the first modern oil refinery, using oil extracted from locally mined torbanite, shale, and bituminous coal to manufacture naphtha and lubricating oils ; paraffin for fuel use and solid paraffin were not sold until 1856. Shale bings near Broxburn, 3 of a total of 19 in West Lothian The world 's first oil refinery was built in 1856 by Ignacy Łukasiewicz. His achievements also included the discovery of how to distill kerosene from seep oil, the invention of the modern kerosene lamp ( 1853 ), the introduction of the first modern street lamp in Europe ( 1853 ), and the construction of the world 's first modern oil well ( 1854 ). The demand for petroleum as a fuel for lighting in North America and around the world quickly grew. Edwin Drake 's 1859 well near Titusville, Pennsylvania, is popularly considered the first modern well. Already 1858 Georg Christian Konrad Hunäus had found a significant amount of petroleum while drilling for lignite 1858 in Wietze, Germany. Wietze later provided about 80 % of the German consumption in the Wilhelminian Era. The production stopped in 1963, but Wietze has hosted a Petroleum Museum since 1970. Drake 's well is probably singled out because it was drilled, not dug ; because it used a steam engine ; because there was a company associated with it ; and because it touched off a major boom. However, there was considerable activity before Drake in various parts of the world in the mid-19th century. A group directed by Major Alexeyev of the Bakinskii Corps of Mining Engineers hand - drilled a well in the Baku region in 1848. There were engine - drilled wells in West Virginia in the same year as Drake 's well. An early commercial well was hand dug in Poland in 1853, and another in nearby Romania in 1857. At around the same time the world 's first, small, oil refinery was opened at Jasło in Poland, with a larger one opened at Ploiești in Romania shortly after. Romania is the first country in the world to have had its annual crude oil output officially recorded in international statistics : 275 tonnes for 1857. The first commercial oil well in Canada became operational in 1858 at Oil Springs, Ontario ( then Canada West ). Businessman James Miller Williams dug several wells between 1855 and 1858 before discovering a rich reserve of oil four metres below ground. Williams extracted 1.5 million litres of crude oil by 1860, refining much of it into kerosene lamp oil. Williams 's well became commercially viable a year before Drake 's Pennsylvania operation and could be argued to be the first commercial oil well in North America. The discovery at Oil Springs touched off an oil boom which brought hundreds of speculators and workers to the area. Advances in drilling continued into 1862 when local driller Shaw reached a depth of 62 metres using the spring - pole drilling method. On January 16, 1862, after an explosion of natural gas Canada 's first oil gusher came into production, shooting into the air at a recorded rate of 3,000 barrels per day. By the end of the 19th century the Russian Empire, particularly the Branobel company in Azerbaijan, had taken the lead in production. 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. The German invasion of the Soviet Union 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 US becoming the leading producer by mid-century. As petroleum production in the US peaked during the 1960s, however, the United States was surpassed by Saudi Arabia and the Soviet Union. Today, about 90 percent of vehicular fuel needs are met by oil. Petroleum also makes up 40 percent of total energy consumption in the United States, but is responsible for only 1 percent 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 ( economically useful energy provided minus energy consumed ), political stability of oil exporting nations and ability to defend oil supply lines. The top three oil producing countries are Russia, Saudi Arabia and the United States. About 80 percent of the world 's readily accessible reserves are located in the Middle East, with 62.5 percent 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 extra heavy oil in Venezuela. 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. Composition In its strictest sense, petroleum includes only crude oil, but in common usage it includes all liquid, gaseous and solid hydrocarbons. Under surface pressure and temperature conditions, lighter hydrocarbons methane, ethane, propane and butane occur as gases, while pentane and heavier hydrocarbons 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 gasoline 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 percent by weight in the lighter oils to as little as 50 percent 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. Many oil reservoirs contain live bacteria. The exact molecular composition of crude oil varies widely from formation to formation but the proportion of chemical elements varies over fairly narrow limits as follows : Composition by weight Element Percent range Carbon 83 to 85 % 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 Alkanes ( paraffins ) 30 % 15 to 60 % Naphthenes 49 % 30 to 60 % Aromatics 15 % 3 to 30 % Asphaltics 6 % remainder Unconventional resources are much larger than conventional ones. 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 a 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 ^ m ) 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 gasoline, both important `` primary energy '' sources. 84 percent by volume of the hydrocarbons present in petroleum is converted into energy - rich fuels ( petroleum - based fuels ), including gasoline, 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 percent 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 km ( 1.2 trillion ( short scale ) barrels ) without oil sands, or 595 km ( 3.74 trillion barrels ) with oil sands. Consumption is currently around 84 million barrels ( 13.4 × 10 ^ m ) per day, or 4.9 km per year, yielding a remaining oil supply of only about 120 years, if current demand remains 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 ( paraffins ), cycloalkanes ( naphthenes ), 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 H. 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 ( C H ) to octane ( C H ) are refined into gasoline, the ones from nonane ( C H ) to hexadecane ( C H ) 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 liquefied petroleum gas under pressure, or used to power the refinery 's own burners. During the winter, butane ( C H ), is blended into the gasoline pool at high rates, because its 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 H. 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 H. 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 gasoline, jet fuel, kerosene, and other hydrocarbons. For example, 2, 2, 4 - trimethylpentane ( isooctane ), widely used in gasoline, has a chemical formula of C H and it reacts with oxygen exothermically : 2 C 8H 18 + 25 O 2 → 16 CO 2 + 18 H 2O ( ΔH = − 5.51 MJ / mol of octane ) The number of various molecules in an oil sample can be determined by laboratory analysis. 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 can not 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. Some of the component of oil will mix with water : the water associated fraction of the oil. Incomplete combustion of petroleum or gasoline 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 gasoline combustion in car engines usually include nitrogen oxides which are responsible for creation of photochemical smog. Empirical equations for thermal properties Heat of combustion At a constant volume, the heat of combustion of a petroleum product can be approximated as follows : Q v = 12,400 − 2,100 d 2 ( displaystyle Q_ ( v ) = 12 (, ) 400 - 2 (, ) 100d ^ ( 2 ) ), where Q v ( displaystyle Q_ ( v ) ) is measured in calories per gram and d ( displaystyle d ) is the specific gravity at 60 ° F ( 16 ° C ). Thermal conductivity The thermal conductivity of petroleum based liquids can be modeled as follows : K = 1.62 A P I ( 1 − 0.0003 ( t − 32 ) ) ( displaystyle K = ( \frac ( 1.62 ) ( API ) ) ( 1 - 0.0003 ( t - 32 ) ) ) where K ( displaystyle K ) is measured in BTU ° F hr ft, t ( displaystyle t ) is measured in ° F and A P I ( displaystyle API ) is degrees API gravity. Specific heat The specific heat of petroleum oils can be modeled as follows : c = 1 d ( 0.388 + 0.00046 t ) ( displaystyle c = ( \frac ( 1 ) ( d ) ) ( 0.388 + 0.00046 t ) ), where c ( displaystyle c ) is measured in BTU / ( lb ° F ), t ( displaystyle t ) is the temperature in Fahrenheit and d ( displaystyle d ) is the specific gravity at 60 ° F ( 16 ° C ). In units of kcal / ( kg ° C ), the formula is : c = 1 d ( 0.4024 + 0.00081 t ) ( displaystyle c = ( \frac ( 1 ) ( d ) ) ( 0.4024 + 0.00081 t ) ), where the temperature t ( displaystyle t ) is in Celsius and d ( displaystyle 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 : L = 1 d ( 110.9 − 0.09 t ) ( displaystyle L = ( \frac ( 1 ) ( d ) ) ( 110.9 - 0.09 t ) ), where L ( displaystyle L ) is measured in BTU / lb, t ( displaystyle t ) is measured in ° F and d ( displaystyle d ) is the specific gravity at 60 ° F ( 16 ° C ). In units of kcal / kg, the formula is : L = 1 d ( 194.4 − 0.162 t ) ( displaystyle L = ( \frac ( 1 ) ( d ) ) ( 194.4 - 0.162 t ) ), where the temperature t ( displaystyle t ) is in Celsius and d ( displaystyle d ) is the specific gravity at 15 ° C. Formation Structure of a vanadium porphyrin compound ( left ) extracted from petroleum by Alfred E. Treibs, father of organic geochemistry. Treibs noted the close structural similarity of this molecule and chlorophyll a ( right ). Petroleum is a fossil fuel derived from ancient fossilized organic materials, such as zooplankton and algae. Vast quantities of these remains settled to sea or lake bottoms, mixing with sediments and being buried under anoxic conditions ( no oxygen ). 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 mainly endothermic reactions at high temperature or pressure, or both. 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 are one example of this. An alternative mechanism was proposed by Russian scientists in the mid-1850s, the hypothesis of abiogenic petroleum origin, but this is contradicted by geological and geochemical evidence. Abiogenic ( formed by inorganic means ) sources of oil have been found, but never in commercially profitable amounts. `` The controversy is n't over whether abiogenic oil reserves exist, '' said Larry Nation of the American Association of Petroleum Geologists. `` The controversy is over how much they contribute to Earth 's overall reserves and how much time and effort geologists should devote to seeking them out. '' Reservoirs Crude oil reservoirs This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( October 2016 ) 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 less dense 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 most reservoirs, however, eventually dissipates. Then the oil must be extracted using `` artificial lift '' means. 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 percent of the oil produced on a daily basis, secondary methods account for about half, and tertiary recovery the remaining 10 percent. 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 quantities of pitch, tar, and oil out of a sort of stone. '' Although oil shales are found in many countries, the United States has the world 's largest deposits. Classification Some marker crudes with their sulfur content ( horizontal ) and API gravity ( vertical ) and relative production quantity See also : Benchmark ( 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 gasoline, 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 revealed 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, consisting of 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 Western Canadian Select the benchmark crude oil for emerging heavy, high TAN ( acidic ) crudes. 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 -- Western Canadian Select -- delivered at Hardisty, Alberta, and for a Brent Blend delivered at Shetland, it may be a discounted Russian Export Blend delivered at the port of Primorsk. Petroleum industry This article needs to be updated. Please update this article to reflect recent events or newly available information. ( April 2016 ) Main article : Petroleum industry Crude oil export treemap ( 2012 ) from Harvard Atlas of Economic Complexity New York Mercantile Exchange prices ( $ / bbl ) for West Texas Intermediate 2000 through Oct 2014 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 gasoline. 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 a critical concern to many nations. Oil accounts for a large percentage of the world 's energy consumption, ranging from a low of 32 percent for Europe and Asia, up to a high of 53 percent for the Middle East, 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 percent of the oil consumed in 2004 went to the United States alone, though by 2007 this had dropped to 21 percent 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. Shipping In the 1950s, shipping costs made up 33 percent of the price of oil transported from the Persian Gulf to USA, but due to the development of supertankers in the 1970s, the cost of shipping dropped to only 5 percent of the price of Persian oil in USA. Due to the increase of the value of the crude oil during the last 30 years, the share of the shipping cost on the final cost of the delivered commodity was less than 3 % in 2010. For example, in 2010 the shipping cost from the Persian Gulf to the USA was in the range of 20 $ / t and the cost of the delivered crude oil around 800 $ / t. Price Nominal and inflation - adjusted US dollar price of crude oil, 1861 -- 2015 Main article : Price of oil 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 product 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. The total cost of a plant is about 9 billion dollars per plant. Fuels A poster used to promote carpooling as a way to ration gasoline during World War II 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 C Liquefied petroleum gas ( LPG ) − 40 Butane − 12 to − 1 Gasoline − 1 to 110 Jet fuel 150 to 205 Kerosene 205 to 260 Fuel oil 205 to 290 Diesel fuel 260 to 315 Petroleum classification according to chemical composition. Class of petroleum Composition of 250 -- 300 ° C fraction, wt. % Par. Napth Arom. Wax Asph. Paraffinic 46 -- 61 22 -- 32 12 -- 25 1.5 -- 10 0 -- 6 Paraffinic - naphtenic 42 -- 45 38 -- 39 16 -- 20 1 -- 6 0 -- 6 Naphthenic 15 -- 26 61 -- 76 8 -- 13 Trace 0 -- 6 Paraffinic - naphtenic - aromatic 27 -- 35 36 -- 47 26 -- 33 0.5 -- 1 0 -- 10 Aromatic 0 -- 8 57 -- 78 20 -- 25 0 -- 0.5 0 -- 20 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 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. Petroleum by country Consumption statistics Global fossil carbon emissions, an indicator of consumption, for 1800 -- 2007. Total Oil Rate of world energy usage per day, from 1970 to 2010. 1000 TWh = 1 PWh. Daily oil consumption from 1980 to 2006 Oil consumption by percentage of total per region from 1980 to 2006 : USA Europe Asia and Oceania Oil consumption 1980 to 2007 by region Consumption According to the US Energy Information Administration ( EIA ) estimate for 2011, the world consumes 87.421 million barrels of oil each day. Oil consumption per capita ( darker colors represent more consumption, gray represents no data ) ( source : see file description ) > 0.07 0.07 - 0.05 0.05 - 0.035 0.035 - 0.025 0.025 - 0.02 0.02 - 0.015 0.015 - 0.01 0.01 - 0.005 0.005 - 0.0015 < 0.0015 This table orders the amount of petroleum consumed in 2011 in thousand barrels ( 1000 bbl ) per day and in thousand cubic metres ( 1000 m ) per day : Consuming nation 2011 ( 1000 bbl / day ) ( 1000 m / day ) Population in millions bbl / year per capita m / year per capita National production / consumption United States 18,835.5 2,994.6 314 21.8 3.47 0.51 China 9,790.0 1,556.5 1345 2.7 0.43 0.41 Japan 4,464.1 709.7 127 12.8 2.04 0.03 India 3,292.2 523.4 1198 0.16 0.26 Russia 3,145.1 500.0 140 8.1 1.29 3.35 Saudi Arabia ( OPEC ) 2,817.5 447.9 27 40 6.4 3.64 Brazil 2,594.2 412.4 193 4.9 0.78 0.99 Germany 2,400.1 381.6 82 10.7 1.70 0.06 Canada 2,259.1 359.2 33 24.6 3.91 1.54 South Korea 2,230.2 354.6 48 16.8 2.67 0.02 Mexico 2,132.7 339.1 109 7.1 1.13 1.39 France 1,791.5 284.8 62 10.5 1.67 0.03 Iran ( OPEC ) 1,694.4 269.4 74 8.3 1.32 2.54 United Kingdom 1,607.9 255.6 61 9.5 1.51 0.93 Italy 1,453.6 231.1 60 8.9 1.41 0.10 Source : US Energy Information Administration Population Data : peak production of oil already passed in this state This country is not a major oil producer Production For oil production by country, see List of countries by oil production. For oil reserves by country, see List of countries by proven oil reserves. Top oil - producing countries ( million barrels per day ) World map with countries by oil production ( information from 2006 -- 2012 ) In petroleum industry parlance, production refers to the quantity of crude extracted from reserves, not the literal creation of the product. Country Oil Production ( bbl / day, 2016 ) Russia 10,551,497 Saudi Arabia ( OPEC ) 10,460,710 United States 8,875,817 Iraq ( OPEC ) 4,451,516 5 Iran ( OPEC ) 3,990,956 6 China, People 's Republic of 3,980,650 7 Canada 3,662,694 8 United Arab Emirates ( OPEC ) 3,106,077 9 Kuwait ( OPEC ) 2,923,825 10 Brazil 2,515,459 11 Venezuela ( OPEC ) 2,276,967 12 Mexico 2,186,877 13 Nigeria ( OPEC ) 1,999,885 14 Angola ( OPEC ) 1,769,615 15 Norway 1,647,975 16 Kazakhstan 1,595,199 17 Qatar ( OPEC ) 1,522,902 18 Algeria ( OPEC ) 1,348,361 19 Oman 1,006,841 20 United Kingdom 939,760 Export See also : Fossil fuel exporters and OPEC Petroleum Exports by Country ( 2014 ) from Harvard Atlas of Economic Complexity Oil exports by country ( barrels per day, 2006 ) In order of net exports in 2011, 2009 and 2006 in thousand bbl / d and thousand m3 / d : # Exporting nation 10 bbl / d ( 2011 ) 10 m / d ( 2011 ) 10 bbl / d ( 2009 ) 10 m / d ( 2009 ) 10 bbl / d ( 2006 ) 10 m / d ( 2006 ) Saudi Arabia ( OPEC ) 8,336 1,325 7,322 1,164 8,651 1,376 Russia 7,083 1,126 7,194 1,144 6,565 1,044 Iran ( OPEC ) 2,540 403 2,486 395 2,519 401 United Arab Emirates ( OPEC ) 2,524 401 2,303 366 2,515 400 5 Kuwait ( OPEC ) 2,343 373 2,124 338 2,150 342 6 Nigeria ( OPEC ) 2,257 359 1,939 308 2,146 341 7 Iraq ( OPEC ) 1,915 304 1,764 280 1,438 229 8 Angola ( OPEC ) 1,760 280 1,878 299 1,363 217 9 Norway 1,752 279 2,132 339 2,542 404 10 Venezuela ( OPEC ) 1,715 273 1,748 278 2,203 350 11 Algeria ( OPEC ) 1,568 249 1,767 281 1,847 297 12 Qatar ( OPEC ) 1,468 233 1,066 169 -- -- 13 Canada 1,405 223 1,168 187 1,071 170 14 Kazakhstan 1,396 222 1,299 207 1,114 177 15 Azerbaijan 836 133 912 145 532 85 16 Trinidad and Tobago 177 112 167 160 155 199 Source : US Energy Information Administration peak production already passed in this state 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 m / d ) in August 2007. Total world production / consumption ( as of 2005 ) is approximately 84 million barrels per day ( 13,400,000 m / d ). Import Oil imports by country ( barrels per day, 2006 ) In order of net imports in 2011, 2009 and 2006 in thousand bbl / d and thousand m3 / d : # Importing nation 10 bbl / day ( 2011 ) 10 m / day ( 2011 ) 10 bbl / day ( 2009 ) 10 m / day ( 2009 ) 10 bbl / day ( 2006 ) 10 m / day ( 2006 ) United States 8,728 1,388 9,631 1,531 12,220 1,943 China 5,487 872 4,328 688 3,438 547 Japan 4,329 688 4,235 673 5,097 810 India 2,349 373 2,233 355 1,687 268 5 Germany 2,235 355 2,323 369 2,483 395 6 South Korea 2,170 345 2,139 340 2,150 342 7 France 1,697 270 1,749 278 1,893 301 8 Spain 1,346 214 1,439 229 1,555 247 9 Italy 1,292 205 1,381 220 1,558 248 10 Singapore 1,172 186 916 146 787 125 11 Republic of China ( Taiwan ) 1,009 160 944 150 942 150 12 Netherlands 948 151 973 155 936 149 13 Turkey 650 103 650 103 576 92 14 Belgium 634 101 597 95 546 87 15 Thailand 592 94 538 86 606 96 Source : US Energy Information Administration peak production of oil expected in 2020 Major oil producer whose production is still increasing Oil Imports to the USA by country 2010 Oil imports to US, 2010 Non-producing consumers Countries whose oil production is 10 % or less of their consumption. # Consuming nation ( bbl / day ) ( m3 / day ) Japan 5,578,000 886,831 Germany 2,677,000 425,609 South Korea 2,061,000 327,673 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 Main article : Environmental impact of the petroleum industry Diesel fuel spill on a road 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 affects without man 's involvement. Regardless of source, petroleum 's effects when released into the environment are similar. Ocean acidification Seawater acidification Ocean acidification is the increase in the acidity of the Earth 's oceans caused by the uptake of carbon dioxide ( CO ) from the atmosphere. This increase in acidity inhibits all marine life -- having a greater impact on smaller organisms as well as shelled organisms ( see scallops ). Global warming When burned, petroleum releases carbon dioxide, a greenhouse gas. Along with the burning of coal, petroleum combustion may be the largest contributor to the increase in atmospheric CO. Atmospheric CO has risen over the last 150 years to current levels of over 390 ppmv, from the 180 -- 300 ppmv of the prior 800 thousand years This rise in temperature may have reduced the Arctic ice cap to 1,100,000 sq mi ( 2,800,000 km ), smaller than ever recorded. Because of this melt, more oil reserves have been revealed. It is estimated by the International Energy Agency that about 13 percent of the world 's undiscovered oil resides in the Arctic. 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. Offshore exploration and extraction of oil disturbs the surrounding marine environment. Oil spills Further information : Oil spill and List of oil spills Kelp after an oil spill Oil slick from the Montara oil spill in the Timor Sea, September, 2009 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, SS 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 SS 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 have been shown to degrade these contaminants. Tarballs A tarball is a blob of crude oil ( not to be confused with tar, which is a man - made product derived from pine trees or refined from 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 or in the Gulf of Mexico off Texas. 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 percent of petroleum was used for transportation ( e.g. gasoline, diesel, jet fuel ), 24 percent by industry ( e.g. production of plastics ), 5 percent for residential and commercial uses, and 2 percent for electricity production. Outside of the US, a higher proportion of petroleum tends to be used for electricity. Alternatives to petroleum - based vehicle fuels Main articles : Alternative fuel vehicle, Hydrogen economy, and Green vehicle Brazilian fuel station with four alternative fuels for sale : diesel ( B3 ), gasohol ( E25 ), neat ethanol ( E100 ), and compressed natural gas ( CNG ) 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, propane autogas, 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 Bioplastic 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 are used, but the primary alternatives remain large - scale hydroelectricity, nuclear and coal - fired generation. Future of petroleum production US oil production and imports, 1910 - 2012 Consumption in the twentieth and twenty - first centuries has been abundantly pushed by automobile growth ; the 1985 -- 2003 oil glut even fueled the sales of low economy vehicles in OECD countries. The 2008 economic crisis seems to have had some impact on the sales of such vehicles ; still, the 2008 oil consumption shows a small increase. In 2016 however Goldman Sachs predicts lower demand due to emerging economies concerns, especially China. The BRICS ( Brasil, Russia, India, China, South Africa ) 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 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. The reach of available petroleum resources has always been around 35 years or even less since the start of the modern exploration. The oil constant, a insider pun in the German industry refers to that effect. Peak oil Main article : Peak oil Global peak oil forecast Peak oil is the projection 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. However, this does not mean that potential oil production has surpassed oil demand. Hubbert applied his theory to accurately predict the peak of U.S. conventional 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. 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 peak is also a moving target as it is now measured as `` liquids '', which includes synthetic fuels, instead of just conventional oil. The International Energy Agency ( IEA ) said in 2010 that production of conventional crude oil had peaked in 2006 at 70 MBBL / d, then flattened at 68 or 69 thereafter. Since virtually all economic sectors rely heavily on petroleum, peak oil, if it were to occur, could lead to a `` partial or complete failure of markets ''. In the mid-2000s, widespread fears of an imminent peak led to the `` peak oil movement, '' in which over one hundred thousand Americans prepared, individually and collectively, for the `` post-carbon '' future. Unconventional production The calculus for peak oil has changed with the introduction of unconventional production methods. In particular, the combination of horizontal drilling and hydraulic fracturing has resulted in a significant increase in production from previously uneconomic plays. Analysts expect that $150 billion will be spent on further developing North American tight oil fields in 2015. The large increase in tight oil production is one of the reasons behind the price drop in late 2014. Certain rock strata contain hydrocarbons but have low permeability and are not thick from a vertical perspective. Conventional vertical wells would be unable to economically retrieve these hydrocarbons. Horizontal drilling, extending horizontally through the strata, permits the well to access a much greater volume of the strata. Hydraulic fracturing creates greater permeability and increases hydrocarbon flow to the wellbore. See also Energy portal Barrel of oil equivalent Filling station Gas oil ratio List of oil exploration and production companies List of oil fields Manure - derived synthetic crude oil Natural Gas Oil burden Petroleum geology Thermal depolymerization Total petroleum hydrocarbon Waste oil Notes Jump up ^ oil - late 12c., `` olive oil, '' from Anglo - French and Old North French olie, from Old French oile, uile `` oil '' ( 12c., Modern French huile ), from Latin oleum `` oil, olive oil '' ( source of Spanish, Italian olio ), from Greek elaion `` olive tree, '' from elaia http://www.etymonline.com/index.php?term=oil&allowed_in_frame=0 Jump up ^ Medieval Latin : literally, rock oil = Latin petr ( a ) rock ( < Greek pétra ) + oleum oil http://www.thefreedictionary.com/petroleum Jump up ^ Medieval Latin : literally, rock oil, equivalent to Latin petr ( a ) rock ( < Greek pétra ) + oleum oil http://www.dictionary.com/browse/petroleum Jump up ^ `` Petroleum ''. 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Table Posted : March 1, 2010 Jump up ^ From DSW - Datareport 2008 ( `` Deutsche Stiftung Weltbevölkerung '' ) Jump up ^ One cubic metre of oil is equivalent to 6.28981077 barrels of oil Jump up ^ `` IBGE ''. IBGE. Retrieved August 29, 2010. Jump up ^ `` Production of Crude Oil including Lease Condensate 2016 '' ( CVS download ). U.S. Energy Information Administration. Retrieved May 30, 2017. Jump up ^ http://tonto.eia.doe.gov/dnav/pet/pet_move_impcus_a2_nus_ep00_im0_mbblpd_m.htm Jump up ^ `` AEO2014 EARLY RELEASE OVERVIEW '' Early report US Energy Information Administration, December 2013. Accessed : December 2013. Quote : `` Domestic production of crude oil... increases sharply... is expected to level off and then slowly decline after 2020 '' Jump up ^ http://seeps.wr.usgs.gov/ Natural Oil and Gas Seeps in California Jump up ^ `` Acidic ocean deadly for Vancouver Island scallop industry ''. cbc.ca. February 26, 2014. Jump up ^ Historical trends in carbon dioxide concentrations and temperature, on a geological and recent time scale. ( June 2007 ). In UNEP / GRID - Arendal Maps and Graphics Library. Retrieved 19 : 14, February 19, 2011. Jump up ^ Deep ice tells long climate story. Retrieved 19 : 14, February 19, 2011. Jump up ^ Mitchell John F.B. ( 1989 ). 1989. pdf `` The `` Greenhouse '' Effect and Climate Change '' Check url = value ( help ) ( PDF ). Reviews of Geophysics. 27 ( 1 ) : 115 -- 139. Bibcode : 1989RvGeo... 27... 115M. doi : 10.1029 / RG027i001p00115. Jump up ^ McKibbin, Bill. Eaarth : Making a Life on a Tough New Planet. New York : Times, 2010 ISBN 978 - 0312541194 Jump up ^ `` Arctic Sea Ice Reaches New Low, Shattering Record Set Just 3 Weeks Ago. '' NBCNews.com, 19 Sept. 2012. Web. 1 Oct. 2012. < http://worldnews.nbcnews.com >. Jump up ^ Waste discharges during the offshore oil and gas activity by Stanislave Patin, tr. Elena Cascio Jump up ^ Torrey Canyon bombing by the Navy and RAF Jump up ^ `` Pumping of the Erika cargo ''. Total.com. Retrieved August 29, 2010. Jump up ^ Sims, Gerald K. ; O'Loughlin, Edward J. ; Crawford, Ronald L. ( 1989 ). `` Degradation of pyridines in the environment ''. Critical Reviews in Environmental Control. Taylor & Francis. 19 ( 4 ) : 309 -- 340. doi : 10.1080 / 10643388909388372. ^ Jump up to : Itah A.Y. and Essien J.P. ( Oct 2005 ). `` Growth Profile and Hydrocarbonoclastic Potential of Microorganisms Isolated from Tarballs in the Bight of Bonny, Nigeria ''. World Journal of Microbiology and Biotechnology. Kluwer Academic. 21 ( 6 -- 7 ) : 1317 -- 1322. doi : 10.1007 / s11274 - 004 - 6694 - z. CS1 maint : Uses authors parameter ( link ) ^ Jump up to : Hostettler, Frances D. ; Rosenbauer, Robert J. ; Lorenson, Thomas D. ; Dougherty, Jennifer ( 2004 ). `` Geochemical characterization of tarballs on beaches along the California coast. Part I -- Shallow seepage impacting the Santa Barbara Channel Islands, Santa Cruz, Santa Rosa and San Miguel ''. Organic Geochemistry. 35 ( 6 ) : 725 -- 746. doi : 10.1016 / j. orggeochem. 2004.01. 022. Jump up ^ Drew Jubera ( August 1987 ). `` Texas Primer : The Tar Ball ''. Texas Monthly. Retrieved 2014 - 10 - 20. Jump up ^ Knap Anthony H, Burns Kathryn A, Dawson Rodger, Ehrhardt Manfred, and Palmork Karsten H ( December 1984 ). `` Dissolved / dispersed hydrocarbons, tarballs and the surface microlayer : Experiences from an IOC / UNEP Workshop in Bermuda ''. Marine Pollution Bulletin. 17 ( 7 ) : 313 -- 319. doi : 10.1016 / 0025 - 326X ( 86 ) 90217 - 1. CS1 maint : Uses authors parameter ( link ) Jump up ^ Wang, Zhendi ; Fingas, Merv ; Landriault, Michael ; Sigouin, Lise ; Castle, Bill ; Hostetter, David ; Zhang, Dachung ; Spencer, Brad ( July 1998 ). `` Identification and Linkage of Tarballs from the Coasts of Vancouver Island and Northern California Using GC / MS and Isotopic Techniques ''. Journal of High Resolution Chromatography. 21 ( 7 ) : 383 -- 395. doi : 10.1002 / ( SICI ) 1521 - 4168 ( 19980701 ) 21 : 7 < 383 : : AID - JHRC383 > 3.0.CO ; 2 - 3. Jump up ^ How Capitalism Saved the Whales by James S. Robbins, The Freeman, August, 1992. Jump up ^ `` U.S. Primary Energy Consumption by Source and Sector, 2007 '' Archived May 6, 2010, at the Wayback Machine... Energy Information Administration Jump up ^ ( 1 ) Jump up ^ Bioprocessing Seattle Times ( 2003 ) Jump up ^ Hume, Neil ; Editor, Commodities ( 2016 - 03 - 08 ). `` Goldman Sachs says commodity rally is unlikely to last ''. Financial Times. ISSN 0307 - 1766. Retrieved 2016 - 03 - 08. Jump up ^ Chris Hogg ( February 10, 2009 ). `` China 's car industry overtakes US ''. BBC News. Jump up ^ OPEC Secretariat ( 2008 ). `` World Oil Outlook 2008 '' ( PDF ). Archived from the original ( PDF ) on April 7, 2009. Jump up ^ Ni Weiling ( October 16, 2006 ). `` Daqing Oilfield rejuvenated by virtue of technology ''. Jump up ^ Samuel Schubert, Peter Slominski UTB, 2010 : Die Energiepolitik der EU Johannes Pollak, - 235 Seiten, p. 20 Jump up ^ Campbell CJ ( December 2000 ). `` Peak Oil Presentation at the Technical University of Clausthal ''. Jump up ^ Hubbert, Marion King ; Shell Development Company ( 1956 ). `` Nuclear energy and the fossil fuels '' ( PDF ). Drilling and Production Practice. Washington, DC : American Petroleum Institute. 95. Archived from the original ( PDF ) on May 27, 2008. Jump up ^ `` New study raises doubts about Saudi oil reserves ''. Iags.org. March 31, 2004. Retrieved August 29, 2010. Jump up ^ Peak Oil Info and Strategies Archived June 17, 2012, at the Wayback Machine. `` The only uncertainty about peak oil is the time scale, which is difficult to predict accurately. '' Jump up ^ `` Peak Oil '' : The Eventual End of the Oil Age pg. 12 Jump up ^ `` Is ' Peak Oil ' Behind Us ? ''. The New York Times. November 14, 2010 Jump up ^ `` Has the World Already Passed `` Peak Oil '' ? ``. National Geographic News. November 9, 2010 Jump up ^ `` Military Study Warns of a Potentially Drastic Oil Crisis ''. Spiegel Online. September 1, 2010. Jump up ^ Schneider - Mayerson Matthew ( 2015 ). Peak Oil : Apocalyptic Environmentalism and Libertarian Political Culture. University of Chicago Press. ISBN 978 - 0 - 226 - 28543 - 6. Jump up ^ U.S. Crude Oil Production Forecast - Analysis of Crude Types ( PDF ), Washington, DC : U.S. Energy Information Administration, 29 May 2014, retrieved 31 May 2014, U.S. oil production has grown rapidly in recent years. U.S. Energy Information Administration ( EIA ) data, which reflect combined production of crude oil and lease condensate, show a rise from 5.7 million barrels per day ( bbl / d ) in 2011 to 7.4 million bbl / d in 2013. EIA 's Short - Term Energy Outlook ( STEO ) projects continuing rapid production growth in 2014 and 2015, with forecast production in 2015 reaching 9.2 million bbl / d. Beyond 2015, EIA 's Annual Energy Outlook ( AEO ) projects further production growth, although its pace and duration remain uncertain. Domestic production plateaus near 9.6 million bbl / d between 2017 and 2020, close to its historic high of 9.6 million bbl / d in 1970, in the AEO2014 Reference case. In the AEO2014 High Oil and Gas Resource case, growth continues through the 2020s and into the 2030s, with production reaching 13.3 million barrels per day in 2036. Jump up ^ Ovale, Peder. `` Her ser du hvorfor oljeprisen faller '' In English Teknisk Ukeblad, 11 December 2014. Accessed : 11 December 2014. References Akiner, Shirin ; Aldis, Anne, eds. ( 2004 ). The Caspian : Politics, Energy and Security. New York : Routledge. ISBN 978 - 0 - 7007 - 0501 - 6. Bauer Georg, Bandy Mark Chance ( tr. ), Bandy Jean A. ( tr. ) ( 1546 ). De Natura Fossilium. vi ( in Latin ). CS1 maint : Multiple names : authors list ( link ) translated 1955 Hyne, Norman J. ( 2001 ). Nontechnical Guide to Petroleum Geology, Exploration, Drilling, and Production. PennWell Corporation. ISBN 0 - 87814 - 823 - X. Mabro, Robert ; Organization of Petroleum Exporting Countries ( 2006 ). Oil in the 21st century : issues, challenges and opportunities. Oxford Press. ISBN 978 - 0 - 19 - 920738 - 1. Maugeri, Leonardo ( 2005 ). The Age of Oil : What They Do n't Want You to Know About the World 's Most Controversial Resource. Guilford, CT : Globe Pequot. p. 15. ISBN 978 - 1 - 59921 - 118 - 3. Speight, James G. ( 1999 ). The Chemistry and Technology of Petroleum. Marcel Dekker. ISBN 0 - 8247 - 0217 - 4. Speight, James G ; Ancheyta, Jorge, eds. ( 2007 ). Hydroprocessing of Heavy Oils and Residua. CRC Press. ISBN 0 - 8493 - 7419 - 7. Vassiliou, Marius ( 2009 ). Historical Dictionary of the Petroleum Industry. Scarecrow Press ( Rowman & Littlefield ). ISBN 0 - 8108 - 5993 - 9. Further reading Kenney, J., Kutcherov, V., Bendeliani, N. and Alekseev, V. ( 2002 ). `` The evolution of multicomponent systems at high pressures : VI. The thermodynamic stability of the hydrogen -- carbon system : The genesis of hydrocarbons and the origin of petroleum ''. Proceedings of the National Academy of Sciences of the United States of America. 99 ( 17 ) : 10976 -- 10981. arXiv : physics / 0505003. Bibcode : 2002PNAS... 9910976K. doi : 10.1073 / pnas. 172376899. PMC 123195. PMID 12177438. CS1 maint : Multiple names : authors list ( link ) Khavari, Farid A. ( 1990 ). Oil and Islam : the Ticking Bomb. First ed. Malibu, Calif. : Roundtable Publications. viii, 277 p., ill. with maps and charts. ISBN 0 - 915677 - 55 - 5 GA Mansoori, N Enayati, LB Agyarko ( 2016 ), Energy : Sources, Utilization, Legislation, Sustainability, Illinois as Model State, World Sci. Pub. Co., ISBN 978 - 981 - 4704 - 00 - 7 External links Wikimedia Commons has media related to Petroleum. Wikisource has the text of the 1905 New International Encyclopedia article Petroleum. American Petroleum Institute -- the trade association of the US oil industry. 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 ? Information on Petroleum and Crude Oil Petroleum Online e-Learning resource from IHRDC Petroleum Community Forum Geo ExPro ( Petroleum Geoscience Magazine ) Joint Organisations Data Initiative Oil and Gas Data Transparency U.S. National Library of Medicine : Hazardous Substances Databank -- Crude Oil Natural petroleum - intensification distillation, increase volume of light fractions Crude : 2007 Australian Broadcasting Corporation documentary ( 3 x 30 minutes ) about the formation of oil, and humanity 's use of it Petroleum industry Petroleum Primary energy Benchmarks Argus Sour Bonny Light Brent Dubai Indian Basket Indonesian Isthmus - 34 Light Japan Cocktail OPEC Reference Basket Tapis Urals West Texas Intermediate Western Canadian Select Data Natural gas Consumption Production Reserves Imports Exports Price Petroleum Consumption Production Reserves Imports Exports Price ( of gasoline and diesel ) Exploration Core sampling Geophysics Integrated asset modelling Petroleum engineering Reservoir simulation Seismic to simulation Petroleum geology Petrophysics Reflection seismology ( Seismic inversion ) Seismic source Drilling Blowout Completion ( Squeeze job ) Differential sticking Directional drilling ( Geosteering ) Drilling engineering Drilling fluid ( invasion ) Drill stem test Lost circulation Measurement Tracers Underbalanced drilling Well logging Production Petroleum fiscal regime Concessions Production sharing agreements Artificial lift Pumpjack Submersible pump ( ESP ) Gas lift Downstream Enhanced oil recovery ( EOR ) Steam injection Gas reinjection Midstream Petroleum product Pipeline transport Refining Upstream Water injection Well intervention XT History 1967 Oil Embargo 1973 oil crisis 1979 energy crisis 1980s oil glut 1990 oil price shock 2000s energy crisis 2010s oil glut Founders History of the petroleum industry Nationalization OPEC GECF Seven Sisters Standard Oil Oil market timelines Provinces and fields List of natural gas fields List of oil fields East Midlands Oil Province East Texas Gulf of Mexico Niger Delta North Sea Permian Basin Persian Gulf Prudhoe Bay Oil Field Russia Venezuela Western Canadian Sedimentary Basin Other topics Acronyms Oil shale gas Peak oil mitigation timing People Petrocurrency Petrodollar recycling Shale gas Swing producer Unconventional oil heavy crude oil sands oil shale Companies and organisations Major petroleum companies Supermajors BP Chevron Eni ExxonMobil Royal Dutch Shell Total National oil companies ADNOC ( UAE ) CNOOC ( China ) CNPC ( China ) Ecopetrol ( Colombia ) Gazprom ( Russia ) Iraq National Oil Company Indian Oil Corporation KazMunayGas ( Kazakhstan ) Kuwait Petroleum Corporation Lotos ( Poland ) Nigerian National Petroleum Corporation NIOC ( Iran ) NISOC ( Iran ) OGDCL ( Pakistan ) ONGC ( India ) PDVSA ( Venezuela ) PKN Orlen ( Poland ) Pemex ( Mexico ) Pertamina ( Indonesia ) PetroBangla ( Bangladesh ) Petrobras ( Brazil ) PetroChina Petronas ( Malaysia ) Petrovietnam PTT ( Thailand ) Qatar Petroleum Rosneft ( Russia ) Saudi Aramco ( Saudi Arabia ) Sinopec ( China ) SOCAR ( Azerbaijan ) Sonangol ( Angola ) Sonatrach ( Algeria ) Statoil ( Norway ) TPAO ( Turkey ) YPF ( Argentina ) Energy trading Glencore Gunvor Mercuria Naftiran Intertrade Trafigura Vitol Other Anadarko Apache BG Group Cenovus Energy Compañía Española de Petróleos ConocoPhillips Devon Galp Energia Hess Husky Energy Imperial Oil Lukoil Marathon Oil Nippon Oil Occidental OMV Port Harcourt Refining Company Reliance Industries Repsol Suncor Energy Surgutneftegas TNK - 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Question: what are the various hydrocarbons present in crude oil
Answer: Alkanes