OPEC | History and definition of the OPEC

OPEC is an intergovernmental organization of twelve developing countries made up of Algeria, Angola, Ecuador, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, the United Arab Emirates, and Venezuela. OPEC has maintained its headquarters in Vienna since 1965, and hosts regular meetings among the oil ministers of its Member Countries. Indonesia withdrew in 2008 after it became a net importer of oil, but stated it would likely return if it became a net exporter again.

According to its statutes, one of the principal goals is the determination of the best means for safeguarding the organization's interests, individually and collectively. It also pursues ways and means of ensuring the stabilization of prices in international oil markets with a view to eliminating harmful and unnecessary fluctuations; giving due regard at all times to the interests of the producing nations and to the necessity of securing a steady income to the producing countries; an efficient and regular supply of petroleum to consuming nations, and a fair return on their capital to those investing in the petroleum industry.

OPEC's influence on the market has been widely criticized, since it became effective in determining production and prices. Arab members of OPEC alarmed the developed world when they used the “oil weapon” during the Yom Kippur War by implementing oil embargoes and initiating the 1973 oil crisis. Although largely political explanations for the timing and extent of the OPEC price increases are also valid, from OPEC’s point of view, these changes were triggered largely by previous unilateral changes in the world financial system and the ensuing period of high inflation in both the developed and developing world. This explanation encompasses OPEC actions both before and after the outbreak of hostilities in October 1973, and concludes that “OPEC countries were only 'staying even' by dramatically raising the dollar price of oil.”

OPEC's ability to control the price of oil has diminished somewhat since then, due to the subsequent discovery and development of large oil reserves in Alaska, the North Sea, Canada, the Gulf of Mexico, the opening up of Russia, and market modernization. As of November 2010, OPEC members collectively hold 79% of world crude oil reserves and 44% of the world’s crude oil production, affording them considerable control over the global market. The next largest group of producers, members of the OECD and the Post-Soviet states produced only 23.8% and 14.8%, respectively, of the world's total oil production. As early as 2003, concerns that OPEC members had little excess pumping capacity sparked speculation that their influence on crude oil prices would begin to slip.

Venezuela and Iran were the first countries to move towards the establishment of OPEC in the 1960s by approaching Iraq, Kuwait and Saudi Arabia in 1949, suggesting that they exchange views and explore avenues for regular and closer communication among petroleum-producing nations. The founding members are Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela. Later members include Algeria, Ecuador, Gabon, Indonesia, Libya, Qatar, Nigeria, and the United Arab Emirates.

In 10–14 September 1960, at the initiative of the Venezuelan Energy and Mines minister Juan Pablo Pérez Alfonzo and the Saudi Arabian Energy and Mines minister Abdullah al-Tariki, the governments of Iraq, Iran, Kuwait, Saudi Arabia and Venezuela met in Baghdad to discuss ways to increase the price of the crude oil produced by their respective countries. OPEC was founded in Baghdad, triggered by a 1960 law instituted by American President Dwight Eisenhower that forced quotas on Venezuelan and Persian Gulf oil imports in favor of the Canadian and Mexican oil industries. Eisenhower cited national security, land access to energy supplies, at times of war. When this led to falling prices for oil in these regions, Venezuela's president Romulo Betancourt reacted by seeking an alliance with oil producing Arab nations as a preemptive strategy to maintain the continued autonomy and profitability of Venezuela's oil resources.

As a result, OPEC was founded to unify and coordinate members' petroleum policies. Original OPEC members include Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela. Between 1960 and 1975, the organization expanded to include Qatar (1961), Indonesia (1962), Libya (1962), the United Arab Emirates (1967), Algeria (1969), and Nigeria (1971). Ecuador and Gabon were early members of OPEC, but Ecuador withdrew on December 31, 1992 because it was unwilling or unable to pay a $2 million membership fee and felt that it needed to produce more oil than it was allowed to under the OPEC quota, although it rejoined in October 2007. Similar concerns prompted Gabon to suspend membership in January 1995. Angola joined on the first day of 2007. Norway and Russia have attended OPEC meetings as observers. Indicating that OPEC is not averse to further expansion, Mohammed Barkindo, OPEC's Secretary General, recently asked Sudan to join. Iraq remains a member of OPEC, but Iraqi production has not been a part of any OPEC quota agreements since March 1998.

In May 2008, Indonesia announced that it would leave OPEC when its membership expired at the end of that year, having become a net importer of oil and being unable to meet its production quota. A statement released by OPEC on 10 September 2008 confirmed Indonesia's withdrawal, noting that it "regretfully accepted the wish of Indonesia to suspend its full Membership in the Organization and recorded its hope that the Country would be in a position to rejoin the Organization in the not too distant future." Indonesia is still exporting light, sweet crude oil and importing heavier, more sour crude oil to take advantage of price differentials (import is greater than export) due to Air pollution in Indonesia still being low as compared to China or The United States.

The persistence of the Arab-Israeli conflict finally triggered a response that transformed OPEC into a formidable political force. After the Six Day War of 1967, the Arab members of OPEC formed a separate, overlapping group, the Organization of Arab Petroleum Exporting Countries, for the purpose of centering policy and exerting pressure on the West over its support of Israel. Egypt and Syria, though not major oil-exporting countries, joined the latter grouping to help articulate its objectives. Later, the Yom Kippur War of 1973 galvanized Arab opinion. Furious at the emergency re-supply effort that had enabled Israel to withstand Egyptian and Syrian forces, the Arab world imposed the 1973 oil embargo against the United States and Western Europe, while non-Arab OPEC members did not.

On 21 December 1975 Ahmed Zaki Yamani and the other oil ministers of the members of OPEC were taken hostage by a six-person team led by terrorist Carlos the Jackal (which included Gabriele Kröcher-Tiedemann and Hans-Joachim Klein), in Vienna, Austria, where the ministers were attending a meeting at the OPEC headquarters. Carlos planned to take over the conference by force and kidnap all eleven oil ministers in attendance and hold them for ransom, with the exception of Ahmed Zaki Yamani and Iran's Jamshid Amuzegar, who were to be executed.

Carlos led his six-person team past two police officers in the building's lobby and up to the first floor, where a police officer, an Iraqi plain clothes security guard and a young Libyan economist were shot dead.

As Carlos entered the conference room and fired shots in the ceiling, the delegates ducked under the table. The terrorists searched for Ahmed Zaki Yamani and then divided the sixty-three hostages into groups. Delegates of friendly countries were moved toward the door, 'neutrals' were placed in the centre of the room and the 'enemies' were placed along the back wall, next to a stack of explosives. This last group included those from Saudi Arabia, Iran, Qatar and the UAE. Carlos demanded a bus to be provided to take his group and the hostages to the airport, where a DC-9 airplane and crew would be waiting. In the meantime, Carlos briefed Ahmed Zaki Yamani on his plan to eventually fly to Aden, where Yamani and the Iranian minister would be killed.

The bus was provided the following morning at 6.40 as requested and 42 hostages were boarded and taken to the airport. The group was airborne just after 9.00 and explosives placed under Yamani's seat. The plane first stopped in Algiers, where Carlos left the plane to meet with the Algierian Foreign minister. All 30 non-Arab hostages were released, excluding Amuzegar.

The refueled plane left for Tripoli where there was trouble in acquiring another plane as had been planned. Carlos decided to instead return to Algiers and change to a Boeing 707, a plane large enough to fly to Baghdad nonstop. Ten more hostages were released before leaving.

With only 10 hostages remaining, the Boeing 707 left for Algiers and arrived at 3.40 a.m. After leaving the plane to meet with the Algerians, Carlos talked with his colleagues in the front cabin of the plane and then told Yamani and Amouzegar that they would be released at mid-day. Carlos was then called from the plane a second time and returned after two hours.

At this second meeting it is believed that Carlos held a phone conversation with Algerian President Houari Boumédienne who informed Carlos that the oil ministers' deaths would result in an attack on the plane. Yamani's biography suggests that the Algerians had used a covert listening device on the front of the aircraft to overhear the earlier conversation between the terrorists, and found that Carlos had in fact still planned to murder the two oil ministers. Boumédienne must also have offered Carlos asylum at this time and possibly financial compensation for failing to complete his assignment.

On returning to the plane Carlos stood before Yamani and Amuzegar and expressed his regret at not being able to murder them. He then told the hostages that he and his comrades would leave the plane after which they would all be free. After waiting for the terrorists to leave, Yamani and the other nine hostages followed and were taken to the airport by Algerian Foreign Minister Abdelaziz Bouteflika. The terrorists were present in the next lounge and Khalid, the Palestinian, asked to speak to Yamani. As his hand reached for his coat, Khalid was surrounded by guards and a gun was found concealed in a holster.

Some time after the attack it was revealed by Carlos' accomplices that the operation was commanded by Wadi Haddad, a Palestinian terrorist and founder of the Popular Front for the Liberation of Palestine. It was also claimed that the idea and funding came from an Arab president, widely thought to be Muammar al-Gaddafi.

In the years following the OPEC raid, Bassam Abu Sharif and Klein claimed that Carlos had received a large sum of money in exchange for the safe release of the Arab hostages and had kept it for his personal use. There is still some uncertainty regarding the amount that changed hands but it is believed to be between US$20 million and US$50 million. The source of the money is also uncertain, but, according to Klein, it was from "an Arab president." Carlos later told his lawyers that the money was paid by the Saudis on behalf of the Iranians and was, "diverted en route and lost by the Revolution".

After 1980, oil prices began a six-year decline that culminated with a 46 percent price drop in 1986. This was due to reduced demand and over-production that produced a glut on the world market. Around this period, Iraq also increased its oil production to help pay for the Iran-Iraq War. Overall OPEC lost its unity and thus its net oil export revenues fell in the 1980s.

The economic needs of the OPEC member states often affects the internal politics behind OPEC production quotas. Various members have pushed for reductions in production quotas to increase the price of oil and thus their own revenues. These demands conflict with Saudi Arabia's stated long-term strategy of being a partner with the world's economic powers to ensure a steady flow of oil that would support economic expansion. Part of the basis for this policy is the Saudi concern that expensive oil or oil of uncertain supply will drive developed nations to conserve and develop alternative fuels. To this point, former Saudi Oil Minister Sheikh Yamani famously said in 1973: "The stone age didn't end because we ran out of stones."

One such production dispute occurred on September 10, 2008, when the Saudis reportedly walked out of OPEC negotiating session where the organization voted to reduce production. Although Saudi Arabian OPEC delegates officially endorsed the new quotas, they stated anonymously that they would not observe them. The New York Times quoted one such anonymous OPEC delegate as saying “Saudi Arabia will meet the market’s demand. We will see what the market requires and we will not leave a customer without oil. The policy has not changed.”

OPEC is a swing producer and its decisions have had considerable influence on international oil prices. For example, in the 1973 energy crisis OPEC refused to ship oil to western countries that had supported Israel in the Yom Kippur War or 6 Day War, which Israel had fought against Egypt and Syria. This refusal caused a fourfold increase in the price of oil, which lasted five months, starting on October 17, 1973, and ending on March 18, 1974. OPEC nations then agreed, on January 7, 1975, to raise crude oil prices by 10%. At that time, OPEC nations — including many who had recently nationalized their oil industries — joined the call for a new international economic order to be initiated by coalitions of primary producers. Concluding the First OPEC Summit in Algiers they called for stable and just commodity prices, an international food and agriculture program, technology transfer from North to South, and the democratization of the economic system. Overall, the evidence suggests that OPEC did act as a cartel when it adopted output rationing in order to maintain price.

According to US government, in 2011 OPEC will break above the $1 trillion mark earnings for the first time at $1.034 trillion and it is beating the $965 billion peak set in 2008.

     

Oil sands | Undestanding and definition of Oil Sands | State Oil Sands produces the largest

Bituminous sands, colloquially known as oil sands or tar sands, are a type of unconventional petroleum deposit. The sands contain naturally occurring mixtures of sand, clay, water, and a dense and extremely viscous form of petroleum technically referred to as bitumen (or colloquially "tar" due to its similar appearance, odour, and colour). Oil sands are found in large amounts in many countries throughout the world, but are found in extremely large quantities in Canada and Venezuela.

The crude bitumen contained in the Canadian oil sands is described by Canadian authorities as "petroleum that exists in the semi-solid or solid phase in natural deposits. Bitumen is a thick, sticky form of crude oil, so heavy and viscous (thick) that it will not flow unless heated or diluted with lighter hydrocarbons. At room temperature, it is much like cold molasses". Venezuelan authorities often refer to similar types of crude oil as extra-heavy oil, because Venezuelan reservoirs are warmer and the oil is somewhat less viscous, allowing it to flow more easily.

Oil sands reserves have only recently been considered to be part of the world's oil reserves, as higher oil prices and new technology enable them to be profitably extracted and upgraded to usable products. They are often referred to as unconventional oil or crude bitumen, in order to distinguish the bitumen extracted from oil sands from the free-flowing hydrocarbon mixtures known as crude oil traditionally produced from oil wells.

Making liquid fuels from oil sands requires energy for steam injection and refining. This process generates two to four times the amount of greenhouse gases per barrel of final product as the production of conventional oil. If combustion of the final products is included, the so-called "Well to Wheels" approach, oil sands extraction, upgrade and use emits 10 to 45% more greenhouse gases than conventional crude.

The exploitation of bituminous deposits and seeps dates back to paleolithic times. The earliest known use of bitumen was by Neanderthals, some 40,000 years ago. Bitumen has been found adhering to stone tools used by Neanderthals at sites in Syria. After the arrival of Homo sapiens, humans used bitumen for construction of buildings and water proofing of reed boats, among other uses. In ancient Egypt, the use of bitumen was important in creating Egyptian mummies—in fact, the word mummy is derived from the Arab word mūmiyyah, which means bitumen.

In ancient times, bitumen was primarily a Mesopotamian commodity used by the Sumerians and Babylonians, although it was also found in the Levant and Persia. Along the Tigris and Euphrates rivers, the area was littered with hundreds of pure bitumen seepages. The Mesopotamians used the bitumen for waterproofing boats and buildings. In North America, the early European fur traders found Canadian First Nations using bitumen from the vast Athabasca oil sands to waterproof their birch bark canoes. In Europe, they were extensively mined near the European city of Pechelbronn, where the vapor separation process was in use in 1742.

The name tar sands was applied to bituminous sands in the late 19th and early 20th century. People who saw the bituminous sands during this period were familiar with the large amounts of tar residue produced in urban areas as a by-product of the manufacture of coal gas for urban heating and lighting. The word "tar" to describe these natural bitumen deposits is really a misnomer, since, chemically speaking, tar is a man-made substance produced by the destructive distillation of organic material, usually coal. Since then, coal gas has almost completely been replaced by natural gas as a fuel, and coal tar as a material for paving roads has been replaced by the petroleum product asphalt. Naturally occurring bitumen is chemically more similar to asphalt than to tar, and the term oil sands (or oilsands) is more commonly used in the producing areas than tar sands because synthetic oil is what is manufactured from the bitumen.

Oil sands are now considered a serious alternative to conventional crude oil, since crude oil is becoming scarcer. Oil sands and oil shale have the potential to generate oil for centuries.

Many countries in the world have large deposits of oil sands, including the United States, Russia, and various countries in the Middle East. However, the world's largest deposits occur in two countries: Canada and Venezuela, each of which have oil sand reserves approximately equal to the world's total reserves of conventional crude oil. As a result of the development of Canadian oil sands reserves, 44% of Canadian oil production in 2007 was from oil sands, with an additional 18% being heavy crude oil, while light oil and condensate had declined to 38% of the total. Because growth of oil sands production has exceeded declines in conventional crude oil production, Canada has become the largest supplier of oil and refined products to the United States, ahead of Saudi Arabia and Mexico. Venezuelan production is also very large, but due to political problems within its national oil company, estimates of its production data are not reliable. Outside analysts believe Venezuela's oil production has declined in recent years, though there is much debate on whether this decline is depletion-related or not.

Bituminous sands are a major source of unconventional oil. Conventional crude oil is normally extracted from the ground by drilling oil wells into a petroleum reservoir, allowing oil to flow into them under natural reservoir pressures, although artificial lift and techniques such as water flooding and gas injection are usually required to maintain production as reservoir pressure drops toward the end of a field's life. Because extra-heavy oil and bitumen flow very slowly, if at all, toward producing wells under normal reservoir conditions, the sands must be extracted by strip mining or the oil made to flow into wells by in situ techniques, which reduce the viscosity by injecting steam, solvents, and/or hot air into the sands. These processes can use more water and require larger amounts of energy than conventional oil extraction, although many conventional oil fields also require large amounts of water and energy to achieve good rates of production.

This is because heavy crude feedstock needs pre-processing before it is fit for conventional refineries. This pre-processing is called 'upgrading', the key components of which are as follows:

• removal of water, sand, physical waste, and lighter products
• catalytic purification by hydrodemetallisation (HDM), hydrodesulfurization (HDS) and hydrodenitrogenation (HDN)
• hydrogenation through carbon rejection or catalytic hydrocracking (HCR)

As carbon rejection is very inefficient and wasteful in most cases, catalytic hydrocracking is preferred in most cases. All these processes take large amounts of energy and water, while emitting more carbon dioxide than conventional oil.

Catalytic purification and hydrocracking are together known as hydroprocessing. The big challenge in hydroprocessing is to deal with the impurities found in heavy crude, as they poison the catalysts over time. Many efforts have been made to deal with this to ensure high activity and long life of a catalyst. Catalyst materials and pore size distributions are key parameters that need to be optimized to deal with these challenge and this varies from place to place, depending on the kind of feedstock present.

At the present time, only Canada has a large-scale commercial oil sands industry, though a small amount of oil from oil sands is produced in Venezuela. Because of increasing oil sands production, Canada has become the largest single supplier of oil and products to the United States. Oil sands now are the source of almost half of Canada's oil production, although due to the 2008 economic downturn work on new projects has been deferred, while Venezuelan production has been declining in recent years. Oil is not produced from oil sands on a significant level in other countries.

Since Great Canadian Oil Sands (now Suncor) started operation of its mine in 1967, bitumen has been extracted on a commercial scale from the Athabasca Oil Sands by surface mining. In the Athabasca sands there are very large amounts of bitumen covered by little overburden, making surface mining the most efficient method of extracting it. The overburden consists of water-laden muskeg (peat bog) over top of clay and barren sand. The oil sands themselves are typically 40 to 60 metres deep, sitting on top of flat limestone rock. Originally, the sands were mined with draglines and bucket-wheel excavators and moved to the processing plants by conveyor belts. In recent years companies such as Syncrude and Suncor have switched to much cheaper shovel-and-truck operations using the biggest power shovels (100 or more tons) and dump trucks (400 tons) in the world. This has held production costs to around $27 per barrel of synthetic crude oil despite rising energy and labour costs.

After excavation, hot water and caustic soda (NaOH) is added to the sand, and the resulting slurry is piped to the extraction plant where it is agitated and the oil skimmed from the top. Provided that the water chemistry is appropriate to allow bitumen to separate from sand and clay, the combination of hot water and agitation releases bitumen from the oil sand, and allows small air bubbles to attach to the bitumen droplets. The bitumen froth floats to the top of separation vessels, and is further treated to remove residual water and fine solids. Bitumen is much thicker than traditional crude oil, so it must be either mixed with lighter petroleum (either liquid or gas) or chemically split before it can be transported by pipeline for upgrading into synthetic crude oil.

The bitumen is then transported and eventually upgraded into synthetic crude oil. About two tons of oil sands are required to produce one barrel (roughly 1/8 of a ton) of oil. Originally, roughly 75% of the bitumen was recovered from the sand. However, recent enhancements to this method include Tailings Oil Recovery (TOR) units which recover oil from the tailings, Diluent Recovery Units to recover naptha from the froth, Inclined Plate Settlers (IPS) and disc centrifuges. These allow the extraction plants to recover well over 90% of the bitumen in the sand. After oil extraction, the spent sand and other materials are then returned to the mine, which is eventually reclaimed.

Alberta Taciuk Process technology extracts bitumen from oil sands through a dry-retorting. During this process, oil sand is moved through a rotating drum, cracking the bitumen with heat and producing lighter hydrocarbons. Although tested, this technology is not in commercial use yet.

Four oil sands mines are currently in operation and two more (Jackpine and Kearl) are in the initial stages of development. The original Suncor mine opened in 1967, while the Syncrude mine started in 1978, Shell Canada opened its Muskeg River mine (Albian Sands) in 2003 and Canadian Natural Resources Ltd opened its Horizon Project in 2009. New mines under construction or undergoing approval include Shell Canada's, Imperial Oil's Kearl Oil Sands Project, Synenco Energy's, and Suncor's.

It is estimated that approximately 90% of the Alberta oil sands and nearly all of Venezuelan sands are too far below the surface to use open-pit mining. Several in-situ techniques have been developed to extract this oil.

Crude oil | Understanding and definition of crude oil

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

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

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

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

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

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

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

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

• West Texas Intermediate (WTI), a very high-quality, sweet, light oil delivered at Cushing, Oklahoma for North American oil
• Brent Blend, comprising 15 oils from fields in the Brent and Ninian systems in the East Shetland Basin of the North Sea. The oil is landed at Sullom Voe terminal in Shetland. Oil production from Europe, Africa and Middle Eastern oil flowing West tends to be priced off this oil, which forms a benchmark
• Dubai-Oman, used as benchmark for Middle East sour crude oil flowing to the Asia-Pacific region
• Tapis (from Malaysia, used as a reference for light Far East oil)
• Minas (from Indonesia, used as a reference for heavy Far East oil)
• The OPEC Reference Basket, a weighted average of oil blends from various OPEC (The Organization of the Petroleum Exporting Countries) countries
• Midway Sunset Heavy, by which heavy oil in California is priced

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

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

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

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

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

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

Petroleum | History and Petroleum definitions | Purpose and function of Petroleum

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

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

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

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

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

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

Due to its high energy density, easy transportability and relative abundance, oil has become the world's most important source of energy since the mid-1950s. Petroleum is also the raw material for many chemical products, including pharmaceuticals, solvents, fertilizers, pesticides, and plastics; the 16% not used for energy production is converted into these other materials. Petroleum is found in porous rock formations in the upper strata of some areas of the Earth's crust. There is also petroleum in oil sands (tar sands). Known oil reserves are typically estimated at around 190 km3 (1.2 trillion (short scale) barrels) without oil sands, or 595 km3 (3.74 trillion barrels) with oil sands. Consumption is currently around 84 million barrels (13.4×106 m3) per day, or 4.9 km3 per year. Which in turn yields a remaining oil supply of only about 120 years, if current demand remain static.

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

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

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

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

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

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

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

Today, about 90% of vehicular fuel needs are met by oil. Petroleum also makes up 40% of total energy consumption in the United States, but is responsible for only 2% 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 are Saudi Arabia, Russia, and the United States. About 80% of the world's readily accessible reserves are located in the Middle East, with 62.5% coming from the Arab 5: Saudi Arabia, UAE, Iraq, Qatar and Kuwait. A large portion of the world's total oil exists as unconventional sources, such as bitumen in Canada and Venezuela and oil shale. While significant volumes of oil are extracted from oil sands, particularly in Canada, logistical and technical hurdles remain, as oil extraction requires large amounts of heat and water, making its net energy content quite low relative to conventional crude oil. Thus, Canada's oil sands are not expected to provide more than a few million barrels per day in the foreseeable future.

Oil price jumps as Goldman Sachs raises forecasts

The US investment bank raised its year-end forecast for Brent to $120 per barrel from $105, and its 2012 forecast to $140 from $120, saying rising demand for fuel would draw global inventories and strain OPEC's spare oil output capacity.

Brent crude for July rose as high as $111.68 a barrel, up $1.58, before easing slightly to $111.53 by 10am GMT. US crude was trading at an intraday peak of $99.15, up $1.45.

Other analysts were also bullish on the outlook for oil prices, with strong underlying demand from the global economy seen as insulating oil from market jitters prompted by European debt worries.

"I don't rule out oil moving back to this year's highs if OPEC keeps its production constant, particularly if we get strong data out of the US, which we expect," Amrita Sen, oil analyst at Barclays Capital, said.

US light crude peaked at just under $115 per barrel at the start of May, while Brent surpassed $127 in April.

Goldman Sachs raised its 12-month price forecast for Brent to $130 a barrel from $107, and increased the end-2012 forecast to $140 a barrel from $120, citing global economic growth and tight OPEC spare capacity.

The bank, which in April had predicted the major correction in oil prices earlier this month, said on May 7 that oil could surpass its recent highs by 2012.

Echoing this view was Morgan Stanley, who raised its 2011 Brent crude forecast to $120 a barrel, from $100 previously, and lifted its 2012 target to $130, from $105.

The loss of around 1.5m barrels per day of Libyan production, and firm demand from emerging economies, will lead to tighter inventories in the second half of the year, the bank's analysts said in a report.

"It is very likely that OPEC will respond to tightening inventories by lifting their production; in response, we see flat prices moving higher as spare capacity continues its fall to untenable levels," the report said.

The Organization of the Petroleum Exporting Countries are scheduled to meet on June 8 in Vienna to discuss output.

An expected fall in US crude stocks last week could also support prices, analysts said. A drop in imports and increased refinery use are forecast to have pushed crude oil inventories lower, according to a Reuters survey of analysts on Monday.

Data showed no let up in Chinese oil imports last month, which grew 9.6pc year-on-year, its third-highest level ever, even as a purchasing managers index on Monday showed China's factories expanding at their slowest pace in 10 months in May. (source : telegraph.co.uk)

Oil rebounds in Asia on higher Chinese demand

SINGAPORE - Oil rebounded in Asian trade Tuesday on surging crude demand from China, the world's second-largest economy, analysts said.

New York's main contract, light sweet crude for July delivery, gained 30 cents to $98 a barrel, while Brent North Sea crude for July delivery rose 61 cents to $110.71.

The "fundamental backdrop for oil remains firm, with an added layer of support coming from the latest Chinese data for April pegging demand at third-highest level ever," said a Barclays Capital report.

"Chinese apparent oil demand in April reached an average of 9.37 million barrels per day, marking an 8.3 percent rise from a year ago due to increased demand during the spring sowing season," said Shailaja Nair, an analyst with energy information provider Platts.

China is the world's second-largest economy and is Asia's top oil consumer.

Analysts said the market was also awaiting more data on oil demand, including those from the American Petroleum Institute.

However, Europe's debt problems and a stronger dollar had been limiting oil price gains.

A stronger US currency makes dollar-priced crude more expensive, leading to lower demand and softer prices. (source : abs-cbnnews.com)