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Sirte Basin

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The Sirte Basin is a late Mesozoic and Cenozoic triple junction continental rift (extensional basin) along northern Africa that was initiated during the late Jurassic Period . It borders a relatively stable Paleozoic craton and cratonic sag basins along its southern margins. The province extends offshore into the Mediterranean Sea , with the northern boundary drawn at the 2,000 meter (m) bathymetric contour. It borders in the north on the Gulf of Sidra and extends south into northern Chad .

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75-416: The Sirte Basin ranks 13th among the world's petroleum provinces, having proven oil reserves estimated at 43.1 billion barrels (6.85 × 10 m) of oil equivalent (36.7  bbl , 37.7 × 10 ^  cu ft (1,070 km) of gas, 0.1 bbl (0.016 m) of NGL ), an amount that constitutes 1.7% of the world’s known oil reserves. The basin consists of one dominant total petroleum system, known as

150-726: A depth of about 2700 m Due to the debts of companies in the sector, oil production dropped by 300,000 barrels per day in Libya, falling to less than 1 million b/d in April 2021 from 1.3 million the month before. Petroleum Petroleum is a naturally occurring yellowish-black liquid mixture. It consists mainly of hydrocarbons , and is found in geological formations . The term petroleum refers both to naturally occurring unprocessed crude oil, as well as to petroleum products that consist of refined crude oil. Conventional reserves of petroleum are primarily recovered by drilling , which

225-520: 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 several 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 October 17, 1850. In 1850, Young & Meldrum and Edward William Binney entered into partnership under

300-512: A much shallower level. The Athabasca oil sands are one example of this. An alternative mechanism to the one described above was proposed by Russian scientists in the mid-1850s, the hypothesis of abiogenic petroleum origin (petroleum formed by inorganic means), but this is contradicted by geological and geochemical evidence. Abiogenic sources of oil have been found, but never in commercially profitable amounts. "The controversy isn't over whether abiogenic oil reserves exist," said Larry Nation of

375-613: A number of proto-continental fragments into an early Gondwanaland . Rifting commenced in the Early Cretaceous, peaked in the Late Cretaceous, and ended in the early Cenozoic, resulting in the triple junction within the basin. The Late Cretaceous rifting event is characterized by formation of a sequence of northwest-trending horsts and grabens that step progressively downward to the east; the Sirte Trough represents

450-476: A process known as catagenesis . Formation of petroleum occurs from hydrocarbon pyrolysis in a variety of mainly endothermic reactions at high temperatures or pressures, or both. These phases are described in detail below. In the absence of plentiful oxygen, aerobic bacteria were prevented from decaying the organic matter after it was buried under a layer of sediment or water. However, anaerobic bacteria were able to reduce sulfates and nitrates among

525-541: A rigid lithosphere and not associated with formation of megasutures. Clifford terms it as an interior fracture basin near the tectonic plate margin, which characteristically has an axis at an angle to that margin. The area's structural weakness is exemplified by alternating periods of uplift and subsidence originating in the Late Precambrian, commencing with the Pan-African orogeny that consolidated

600-482: 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 . Ionian Sea The Ionian Sea ( Modern Greek : Ιόνιο Πέλαγος , romanized :  Iónio Pélagos , IPA: [iˈoni.o ˈpelaɣos] ; Italian : Mar Ionio or Mar Jonio , IPA: [mar ˈjɔːnjo] ; Albanian : Deti Jon , IPA: [ˈdɛti ˈjɔn] )

675-665: A significant amount of petroleum while drilling for lignite in Wietze , Germany. Wietze later provided about 80% of German consumption in the Wilhelminian Era. The production stopped in 1963, but Wietze has hosted a Petroleum Museum since 1970. 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,

750-574: A source of internal and inter-state conflict, leading to both state-led wars and other resource conflicts . Production of petroleum is estimated to reach peak oil before 2035 as global economies lower dependencies on petroleum as part of climate change mitigation and a transition towards renewable energy and electrification . The word petroleum comes from Medieval Latin petroleum (literally 'rock oil'), which comes from Latin petra 'rock' (from Greek pétra πέτρα ) and oleum 'oil' (from Greek élaion ἔλαιον ). The origin of

825-411: A variety of liquid, gaseous, and solid components. Lighter hydrocarbons are the gases methane , ethane , propane and butane . Otherwise, the bulk of the liquid and solids are largely heavier organic compounds, often hydrocarbons (C and H only). The proportion of light hydrocarbons in the petroleum mixture varies among oil fields . An oil well produces predominantly crude oil. Because the pressure

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900-526: A visit to Fort Duquesne in 1750. 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. Merkwiller-Pechelbronn 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, notably for medical purposes. There

975-554: 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

1050-641: Is an elongated bay of the Mediterranean Sea . It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy , including Basilicata , Calabria , Sicily , and the Salento peninsula to the west, southern Albania (and western Apulia , Italy) to the north, and the west coast of Greece , including the Peloponnese . All major islands in the sea, which are located in

1125-491: Is called diagenesis , a word that means a transformation of materials by dissolution and recombination of their constituents. Kerogen formation continued to a depth of about 1 km from the Earth's surface where temperatures may reach around 50 °C . Kerogen formation represents a halfway point between organic matter and fossil fuels : kerogen can be exposed to oxygen, oxidize and thus be lost, or it could be buried deeper inside

1200-726: 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

1275-738: Is done after a study of the relevant structural geology , analysis of the sedimentary basin , and characterization of the petroleum reservoir . There are also unconventional reserves such as oil sands and oil shale which are recovered by other means such as fracking . Once extracted, oil is refined and separated, most easily by distillation , into innumerable products for direct use or use in manufacturing. Products include fuels such as gasoline (petrol), diesel , kerosene and jet fuel ; asphalt and lubricants ; chemical reagents used to make plastics ; solvents , textiles , refrigerants , paint , synthetic rubber , fertilizers , pesticides , pharmaceuticals , and thousands of others. Petroleum

1350-529: Is in the Ionian Sea, at 36°34′N 21°8′E  /  36.567°N 21.133°E  / 36.567; 21.133 . The sea is one of the most seismically active areas in the world. The name Ionian comes from the Greek word Ionion (Ἰόνιον) . Its etymology is unknown. Ancient Greek writers, especially Aeschylus , linked it to the myth of Io . In ancient Greek the adjective Ionios ( Ἰόνιος )

1425-473: 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 is higher than at the surface, the gas may contain heavier hydrocarbons such as pentane, hexane , and heptane (" natural-gas condensate ", often shortened to condensate. ) Condensate resembles gasoline in appearance and

1500-756: Is now called the Drake Well in Cherrytree Township, Pennsylvania .There also was a company associated with it, and it sparked a major oil drilling boom. 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

1575-451: Is similar in composition to some volatile light crude oils . The hydrocarbons in crude oil are mostly alkanes , cycloalkanes and various aromatic hydrocarbons , while the other organic compounds contain nitrogen , oxygen , and sulfur , and traces 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

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1650-473: Is used in manufacturing a vast variety of materials essential for modern life, and it is estimated that the world consumes about 100 million barrels (16 million cubic metres ) each day. Petroleum production played a key role in industrialization and economic development. Some countries, known as petrostates , gained significant economic and international power over their control of oil production and trade. Petroleum exploitation can be damaging to

1725-602: The Early Cretaceous Maragh Formation at a depth of 10,000 feet (3,000 m). The Sarir Field produces from a Cretaceous Sandstone in an anticline with fault blocks discovered from a seismic survey. The Messla Field produces from the Lower Cretaceous fluvial Sarir sandstone 27 m thick at a depth of 2682 m. The Intisar 'D' Oil Field produces from an upper Paleocene pinnacle reef 385 m thick, 5 km in diameter, and at

1800-674: The Earth's crust and be subjected to conditions which allow it to slowly transform into fossil fuels like petroleum. The latter happened through catagenesis in which the reactions were mostly radical rearrangements of kerogen. These reactions took thousands to millions of years and no external reactants were involved. Due to the radical nature of these reactions, kerogen reacted towards two classes of products: those with low H/C ratio ( anthracene or products similar to it) and those with high H/C ratio ( methane or products similar to it); i.e., carbon-rich or hydrogen-rich products. Because catagenesis

1875-490: The Orinoco Belt . 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. Petroleum consists of

1950-808: The Soviet Union in total output. In 1973 , Saudi Arabia and other Arab nations imposed an oil embargo against the United States, United Kingdom, Japan and other Western nations which supported Israel in the Yom Kippur War of October 1973. The embargo caused an oil crisis . This was followed by the 1979 oil crisis , which was caused by a drop in oil production in the wake of the Iranian Revolution and caused oil prices to more than double. The two oil price shocks had many short- and long-term effects on global politics and

2025-540: The United States , but is responsible for only one 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 . The top three oil-producing countries as of 2018 are the United States, Russia , and Saudi Arabia . In 2018, due in part to developments in hydraulic fracturing and horizontal drilling ,

2100-455: The actinomycetales order of bacteria also produced antibiotic compounds (e.g., streptomycin ). Thus the action of anaerobic bacteria ceased at about 10 m below the water or sediment. The mixture at this depth contained fulvic acids, unreacted and partially reacted fats and waxes, slightly modified lignin , resins and other hydrocarbons. As more layers of organic matter settled into the sea or lake bed, intense heat and pressure built up in

2175-585: The 12th century. It has also been present in Romania since the 13th century, being recorded as păcură. Sophisticated oil pits, 4.5 to 6 metres (15 to 20 ft) deep, were dug by the Seneca people and other Iroquois in Western Pennsylvania as early as 1415–1450. The French General Louis-Joseph de Montcalm encountered Seneca using petroleum for ceremonial fires and as a healing lotion during

2250-664: The 1988 bombing of Pan Am Flight 103 . Additional sanctions applied by the US Sanctions Act of 1996 were relaxed in 1999. Since then, American and other foreign oil companies have returned to resume their operations in Libya, led by AGIP (Italy), OMV (Austria), Veba (Germany), Total (France), Nimir (Saudi Arabia), WOC ( National Oil Corporation , Conoco , Marathon , Amerada Hess ), and ETAP of Tunisia. In 2020, operations were transferred by Wintershall Aktiengesellschaft to Sarir Oil Operations. In August 2021, state-owned company NOC announced plans for resuming operations in

2325-503: 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." Three conditions must be present for oil reservoirs to form: 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

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2400-455: The Earth's surface. Unusual magma intrusions, however, could have created greater localized heating. 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. 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

2475-798: The Sirte Basin was observed in a coastal water well drilled by Italian colonists during the Italian-occupation . The Italian government embarked on geologic investigations of the area and produced a geologic map in 1934. Shows of natural gas were observed in the late 1930s, but World War II interrupted exploration efforts. Competitive bidding for concessions was subsequently permitted by two mineral laws passed in 1953 and 1955, and exploration by Esso , Mobil , Texas Gulf, and others commenced with seismic , magnetic, and gravity data being collected. From 1956 to 1961 giant oil fields were discovered. Libya started exporting oil in 1961 and by 1966 it

2550-582: The Sirte basin is characterized by desert steppes and includes eolian deposits from the Rebiana and Kalansho Sand Sea of the Sahara Desert . In a relatively narrow, northern coastal strip, some land areas are as much as 47 m below sea level. The basin is floored by a northwest-southeast-trending mosaic of narrow horsts and grabens , an important structural characteristic that distinguishes it from

2625-566: The Sirte-Zelten. The Late Cretaceous Sirte Shale is the primary hydrocarbon source bed. Reservoirs range in rock type and age from fractured Precambrian basement, clastic reservoirs in the Cambrian - Ordovician Gargaf Sandstone , and Lower Cretaceous Nubian Sandstone to Paleocene Zelten Formation and Eocene carbonates usually in the form of bioherms. Hydrocarbon generation commenced about 50 million years ago (Ma) in

2700-622: The South Cyrenaica Fault Zone (SCFZ) and the Cyrenaica Platform to the east, is strongly influenced by extensional dextral strike-slip faulting . To the south, the Nubian Swell is the stable continental basement for this rifted basin. In geology, "trap" refers to the stratigraphic or tectonic structural feature that ensures the juxtaposition of reservoir and seal such that hydrocarbons remain trapped in

2775-586: 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 U.S. becoming the leading producer by mid-century. As petroleum production in the U.S. peaked during the 1960s, the United States was surpassed by Saudi Arabia and

2850-576: The United States became the world's largest producer. About 80 percent of the world's readily accessible reserves are located in the Middle East , with 62.5 percent coming from the Arab five: Saudi Arabia , United Arab Emirates , Iraq , Qatar , and Kuwait . A large portion of the world's total oil exists as unconventional sources, such as bitumen in Athabasca oil sands and extra heavy oil in

2925-447: The adjacent intracratonic Kufra , Murzuk , and Ghadames basins. The area of the Sirte Basin occupies about 230,000 km, with a wildcat drilling density of one new field wildcat per 145 km. Overall drilling density of the basin is 3.3 wells per 100 km, with an average field depth of 2,100 m. Recent indications of hydrocarbons within grabens suggest that these areas have potential as well as clastic reservoirs beneath

3000-627: The air at a recorded rate of 480 cubic metres (3,000 bbl) 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 20th century, including World War II , during which oil facilities were a major strategic asset and were extensively bombed . The German invasion of

3075-551: The area around modern Baku , Azerbaijan . These fields were described by the Persian geographer Abu Bakr al-Razi in the 10th century, and by Marco Polo in the 13th century, who described the output of those wells as hundreds of shiploads. Arab and Persian chemists also distilled crude oil to produce flammable products for military purposes. Through Islamic Spain , distillation became available in Western Europe by

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3150-579: The basin. In 2007, the Energy Information Administration estimated that the Sirte Basin Province contains approximately 80% of Libya's total proven oil reserves (41.5 billion barrels (6.60 × 10 m) as of January 2007) and accounted for roughly 90% of the country's total oil output, which was 1.80 Mbbl/d (286,000 m/d) in 2006. Over twenty-three large oil fields and sixteen giant oil fields occur in

3225-543: The carbonate reservoirs in the Central Sirte Basin. The offshore area beyond 200 m depths is largely unexplored. The Sirte Basin province is considered to be a type locality of a continental rift (extensional) area and is referred to as part of the Tethyan rift system. According to the designation scheme of Bally and Snelson, it is classified as 1211; a cratonic basin located on earlier rifted grabens on

3300-474: The coal industry dominated the petroleum technologies. Chemist James Young in 1847 noticed a natural petroleum seepage in the coal mine at riddings Alfreton , Derbyshire from which he distilled a light thin oil suitable for use as lamp oil, at the same time obtaining a more viscous oil suitable for lubricating machinery. In 1848, Young set up a small business refining crude oil. Young eventually succeeded, by distilling cannel coal at low heat, in creating

3375-407: The deeper basins, about 40 Ma in many other areas, and may continue to the present day. Geothermal gradients generally range from 1 °F/100 ft to 1.8 °F/100 ft ; horsts and grabens generally have roughly equivalent thermal regimes relative to the primary source rock. Along the southwest and west margins of the province are extrusive igneous deposits that tend to diminish

3450-599: The deepest portion of the basin. These horsts and grabens extend from onshore areas northward into a complex offshore terrane that includes the Ionian Sea abyssal plain to the northeast. This plain is underlain by oceanic crust that is being subducted to the north and east beneath the Hellenic arc . The Pelagian province to the west, particularly the pull-apart basins of the Sabratah Basin and extending along

3525-573: The earliest Chinese writings, cites that 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 record the use of petroleum as fuel as early as the fourth century BCE. By 347 CE, oil was produced from bamboo-drilled wells in China. In the 7th century, petroleum was among the essential ingredients for Greek fire , an incendiary projectile weapon that

3600-570: The east of the sea, belong to Greece . They are collectively named the Ionian Islands , the main ones being Corfu , Kefalonia , Zakynthos , Lefkada , and Ithaca . There are ferry routes between Patras and Igoumenitsa , Greece, and Brindisi and Ancona , Italy, that cross the east and north of the Ionian Sea, and from Piraeus westward. Calypso Deep , the deepest point in the Mediterranean at 5,109 m (16,762 ft),

3675-469: The environment and human health. Extraction , refining and burning of petroleum fuels all release large quantities of greenhouse gases , so petroleum is one of the major contributors to climate change . Other negative environmental effects include direct releases, such as oil spills , as well as air and water pollution at almost all stages of use. These environmental effects have direct and indirect health consequences for humans. Oil has also been

3750-425: The fact that it happened at relatively low temperatures (when compared to commercial pyrolysis plants) of 60 to several hundred °C. Pyrolysis was possible because of the long reaction times involved. Heat for catagenesis came from the decomposition of radioactive materials of the crust, especially K , Th , U and U . The heat varied with geothermal gradient and was typically 10–30 °C per km of depth from

3825-815: The global economy. They led to sustained reductions in demand as a result of substitution to other fuels, especially coal and nuclear, and improvements in energy efficiency , facilitated by government policies. High oil prices also induced investment in oil production by non-OPEC countries, including Prudhoe Bay in Alaska, the North Sea offshore fields of the United Kingdom and Norway, the Cantarell offshore field of Mexico, and oil sands in Canada. About 90 percent of vehicular fuel needs are met by oil. Petroleum also makes up 40 percent of total energy consumption in

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3900-408: 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 in modern refineries into more valuable products. The lightest fraction, the so-called petroleum gases are subjected to diverse processing depending on cost. These gases are either flared off , sold as liquefied petroleum gas , or used to power

3975-465: The hydrocarbon potential of these areas. The Gialo High is a relatively small horst block in the eastern Sirte Basin. It is most important and primarily known for the stacked oil fields in rocks ranging from the Early Cretaceous to Oligocene age. There are several billion barrels of oil reserves associated with the structure both over the crest of the horst as well as flanking the high in the adjacent graben. Notes: 1. USGS 2002. The land area in

4050-658: 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 "mine" (1854). at Bóbrka , near Krosno (still operational as of 2020). The demand for petroleum as a fuel for lighting in North America and around the world quickly grew. The first oil well in the Americas was drilled in 1859 by Edwin Drake at what

4125-446: The large number of co-eluted hydrocarbons within oil, many cannot be resolved by traditional gas chromatography. This unresolved complex mixture (UCM) of hydrocarbons is particularly apparent when analysing weathered oils and extracts from tissues of organisms exposed to oil. 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

4200-411: The lower regions. As a consequence, compounds of this mixture began to combine in poorly understood ways to kerogen . Combination happened in a similar fashion as phenol and formaldehyde molecules react to urea-formaldehyde resins, but kerogen formation occurred in a more complex manner due to a bigger variety of reactants. The total process of kerogen formation from the beginning of anaerobic decay

4275-899: The matter to H 2 S and N 2 respectively by using the matter as a source for other reactants. Due to such anaerobic bacteria, at first, this matter began to break apart mostly via hydrolysis : polysaccharides and proteins were hydrolyzed to simple sugars and amino acids respectively. These were further anaerobically oxidized at an accelerated rate by the enzymes of the bacteria: e.g., amino acids went through oxidative deamination to imino acids , which in turn reacted further to ammonia and α-keto acids . Monosaccharides in turn ultimately decayed to CO 2 and methane . The anaerobic decay products of amino acids, monosaccharides, phenols and aldehydes combined into fulvic acids . Fats and waxes were not extensively hydrolyzed under these mild conditions. Some phenolic compounds produced from previous reactions worked as bactericides and

4350-556: The proportion of chemical elements varies over fairly narrow limits as follows: Four different types of hydrocarbon appear in crude oil. The relative percentage of each varies from oil to oil, determining the properties of each oil. The alkanes from pentane (C 5 H 12 ) to octane (C 8 H 18 ) are refined into gasoline, the ones from nonane (C 9 H 20 ) to hexadecane (C 16 H 34 ) into diesel fuel , kerosene and jet fuel . Alkanes with more than 16 carbon atoms can be refined into fuel oil and lubricating oil . At

4425-594: The province. Libya's onshore oil has historically been discovered mainly within the confines of three major geological trends occurring in the Sirte Basin: Notes: 1. USGS 2002 (Bbbl = "billion barrels of oil"). 2. LOF = large oil fields (>100 million barrels of oil equivalent ): GOF = giant oil fields (>500 million barrels of oil equivalent). The Amal Field produces from the Cambro- Ordovician Amal Formation and

4500-644: The refinery's own burners. During the winter, butane (C 4 H 10 ), is blended into the gasoline pool at high rates, because its high vapour pressure assists with cold starts. The aromatic hydrocarbons are unsaturated hydrocarbons that have one or more benzene rings . They tend to burn with a sooty flame, and many have a sweet aroma. Some are carcinogenic . These different components are separated by fractional distillation at an oil refinery to produce gasoline, jet fuel, kerosene, and other hydrocarbon fractions. The components in an oil sample can be determined by gas chromatography and mass spectrometry . Due to

4575-412: 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

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4650-518: The same time the world's first, small, oil refinery was opened at Jasło in Poland (then Austria), with a larger one opened at Ploiești in Romania shortly after. Romania (then being a vassal of the Ottoman empire) is the first country in the world to have had its annual crude oil output officially recorded in international statistics: 275 tonnes for 1857. In 1858, Georg Christian Konrad Hunäus found

4725-523: The second half of the 19th century, the term became commonly known for the liquid form of hydrocarbons. Petroleum, in one form or another, has been used since ancient times. More than 4300 years ago, bitumen was mentioned when the Sumerians used it to make boats. A tablet of the legend of the birth of Sargon of Akkad mentions a basket which was closed by straw and bitumen. More than 4000 years ago, according to Herodotus and Diodorus Siculus , asphalt

4800-662: The subsurface, rather than escaping (due to their natural buoyancy ). Oil and gas trapped within the porous rock unit migrate to a high point in the structure because of their low density. In the Sirte Basin the dominant trap style is structural (84 percent), with the remainder considered stratigraphic or a combination of the two. As examples of combined traps, bioherm developments in the Paleocene Zelten Group are found on horst blocks, and clastic stratigraphic traps such as at Sarir or Messla field are superimposed on structures. The first reported petroleum occurrence in

4875-408: The term stems from monasteries in southern Italy where it was in use by the end of the first millennium as an alternative for the older term " naphtha ". After that, the term was used in numerous manuscripts and books, such as in the treatise De Natura Fossilium , published in 1546 by the German mineralogist Georg Bauer , also known as Georgius Agricola. After the advent of the oil industry, during

4950-539: 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. The world's first oil refinery was built in 1856 by Ignacy Łukasiewicz in Austria. His achievements also included the discovery of how to distill kerosene from seep oil,

5025-468: The volume of the world's reserves of conventional oil. Petroleum is a fossil fuel derived from fossilized organic materials , such as zooplankton and algae . Vast amounts of these remains settled to sea or lake bottoms where they were covered in stagnant water (water with no dissolved oxygen ) or sediments such as mud and silt faster than they could decompose aerobically . Approximately 1 m below this sediment, water oxygen concentration

5100-542: Was a son of Adrias (eponymic for the Adriatic Sea ); according to another, Ionius was a son of Dyrrhachus . When Dyrrhachus was attacked by his own brothers, Heracles , who was passing through the area, came to his aid, but in the fight the hero killed his ally's son by mistake. The body was cast into the water, and thereafter was called the Ionian Sea. Cham Albanians used to call the Ionian sea "The Lady's Domain". The International Hydrographic Organization defines

5175-634: Was activity 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 of Bibi-Heybat in 1846. 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

5250-414: Was closed off from external reactants, the resulting composition of the fuel mixture was dependent on the composition of the kerogen via reaction stoichiometry . Three types of kerogen exist: type I (algal), II (liptinic) and III (humic), which were formed mainly from algae , plankton and woody plants (this term includes trees , shrubs and lianas ) respectively. Catagenesis was pyrolytic despite

5325-423: Was low, below 0.1 mg/L, and anoxic conditions existed. Temperatures also remained constant. As further layers settled into 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 , found in various oil shales around the world, and then with more heat into liquid and gaseous hydrocarbons via

5400-559: Was the 7th largest oil-producing nation in the world. During 1969, output from the Sirte Basin had even exceeded production from Saudi Arabia (3 Mmbpd). Libya nationalized its oil industry in 1973, and some American oil companies began withdrawing in 1982, following a 1981 US trade embargo . By 1986, the US government ordered remaining US companies to cease activities in Libya. In 1992, the United Nations sanctioned Libya in response to

5475-531: Was used as an epithet for the sea because Io swam across it. According to the Oxford Classical Dictionary , the name may derive from Ionians who sailed to the West, however the word for Ionians is spelled with an omega ( Ἴωνες) rather than an omicron as in the word for the Ionian Sea. There were also narratives about other eponymic legendary figures; according to one version, Ionius

5550-479: Was used by Byzantine Greeks against Arab ships, which were then attacking Constantinople . Crude oil was also distilled by Persian chemists , with clear descriptions given in Arabic handbooks such as those of Abu Bakr al-Razi (Rhazes). The streets of Baghdad were paved with tar , derived from petroleum that became accessible from natural fields in the region. In the 9th century, oil fields were exploited in

5625-544: Was used in the construction of the walls and towers of Babylon ; there were oil pits near Ardericca and Babylon, and a pitch spring on Zakynthos . 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 in ancient China dates back to more than 2000 years ago. The I Ching , one of

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