Ameer Randolph
Fossil fuels are non-renewable energy sources that are made from biological matter. They include coal, oil, and natural gas, which are burned to produce electricity, heat, and transportation fuel. Oil, also known as petroleum or crude oil, is a liquid fossil fuel made up of hydrocarbons and can be found in underground reservoirs or sedimentary rock. Coal is a solid, carbon-heavy rock that comes in four main varieties. The burning of fossil fuels releases carbon dioxide (CO2) and is a major contributor to global climate change. While fossil fuels have been key to industrialization and technological progress, there is a growing need to transition to low-carbon energy sources and reduce their environmental impact.
| Characteristics | Values |
|---|---|
| Definition | A hydrocarbon-containing material of biological origin that can be burned for energy |
| Examples | Coal, petroleum, natural gas, oil shales, bitumens, tar sands, heavy oils, crude oil |
| Origin | Fossil fuels are formed from the remains of organic matter produced by prehistoric plants and animals |
| Environmental Impact | Fossil fuels are a major contributor to global climate change due to their high carbon content and emissions of harmful air pollutants |
| Industrial Impact | Fossil fuels have been key to industrialization and technological, social, and economic progress |
| Energy Source | Fossil fuels supply the majority of energy consumed in industrially developed countries |
| Extraction Methods | Drilling, mining, hydraulic fracturing (fracking), rotary drilling, directional drilling, strip mining |
| Alternatives | Low-carbon energy sources such as nuclear and renewables are being explored as alternatives to reduce dependence on fossil fuels |
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What You'll Learn
Crude oil and petroleum
Crude oil is a liquid fossil fuel that is primarily composed of hydrocarbons, which are compounds of hydrogen and carbon. It is found in underground reservoirs, in the cracks and crevices of sedimentary rock, and in tar sands near the earth's surface. The process of extracting crude oil involves drilling on land or at sea, or strip mining in the case of tar sands oil and oil shale. Once extracted, the oil is transported to refineries where it is transformed into usable petroleum products.
Petroleum products are fuels and other materials made from crude oil and the hydrocarbons contained in natural gas. The process of refining crude oil involves separating it into its various components and then reconfiguring those components into new products. This is typically done through distillation, where the liquids and vapors are separated according to their boiling points. The lightest fractions, such as gasoline, rise to the top of the distillation tower, while heavier liquids, like gas oils, separate lower down.
The products derived from petroleum include fuels such as gasoline, diesel, jet fuel, and kerosene, as well as other materials such as waxes, lubricating oils, asphalt, and chemicals used in plastics and paint. Petroleum products play a significant role in our daily lives, especially in transportation, heating, and electricity generation. However, it's important to note that the process of finding, producing, and moving crude oil can have negative environmental impacts, including disturbing land and marine ecosystems.
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Natural gas
Fossil fuels are hydrocarbon-containing materials of biological origin that can be burned for energy. They are non-renewable energy sources formed from the remains of organic matter produced by photosynthesis millions of years ago. Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. All fossil fuels contain carbon and their combustion releases carbon into the Earth's atmosphere. It is estimated that about 80% of all man-made CO2 and greenhouse gas emissions come from the combustion of fossil fuels.
The process of extracting natural gas from shale and sedimentary rock formations is called hydraulic fracturing or fracking. This process involves forcing water, chemicals, and sand down a well under high pressure, which breaks up the rock formation and releases the natural gas. The gas then flows to and up wells to the surface, where it is collected in gathering pipelines and sent to natural gas processing plants. At these plants, water vapor and non-hydrocarbon compounds are removed, and natural gas liquids (NGLs) such as ethane, propane, and butanes are separated from the wet gas and sold separately. The processed natural gas is called dry, consumer-grade, or pipeline-quality natural gas, and it is sent through pipelines to underground storage fields or directly to consumers.
There are two main forms of natural gas used in vehicles: compressed natural gas (CNG) and liquefied natural gas (LNG). CNG is produced by compressing natural gas to less than 1% of its volume at standard atmospheric pressure, while LNG is produced by purifying and super-cooling natural gas to a liquid state. Both CNG and LNG are domestically produced, relatively low-priced, and commercially available as alternative fuels. However, LNG has a relatively high production cost and requires expensive cryogenic tanks for storage, limiting its commercial applications.
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Coal
However, coal is a significant contributor to climate change and environmental degradation. The extraction and burning of coal release large amounts of carbon dioxide (CO2), a greenhouse gas. Coal mining can also emit methane, another potent greenhouse gas. In 2020, coal burning resulted in 14 billion tonnes of CO2 emissions, accounting for 40% of total fossil fuel emissions and over 25% of global greenhouse gas emissions. Coal fires, often started by lightning strikes, can burn underground for extended periods, releasing combustion gases and initiating wildfires.
Due to the environmental and health impacts of coal, many countries have committed to reducing or eliminating their use of coal power. The United Nations has played a pivotal role in urging governments to halt the construction of new coal plants and agreeing to phase out unabated coal use.
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Oil shales and tar sands
Oil shale and tar sands are examples of fossil fuels that are formed from organic matter over millions of years. Oil shale is a type of rock that contains a significant amount of organic material called kerogen, which is a waxy, solid form of hydrocarbons. Kerogen can be converted into synthetic oil through a process called retorting, where it is heated and the oil is distilled. Oil shale deposits are found in many parts of the world, with the largest known deposits in the Green River Formation region spanning Colorado, Utah, and Wyoming, estimated to hold 4.3 trillion barrels of oil shale resources.
Tar sands, also known as oil sands, are a mixture of sand, clay, water, and bitumen, a thick, molasses-like substance composed of hydrocarbons. Tar sands can be found in several countries, including Venezuela, the United States, Canada, Russia, and the Middle East. The largest deposits of tar sands in the world are found in Canada and Venezuela, with the Athabasca deposit in Alberta, Canada, being the most prominent and technologically advanced site for production.
The process of extracting and refining oil from oil shales and tar sands is more complex and costly compared to conventional liquid oil. For instance, the production of light distillates like gasoline from oil shale requires additional processing such as hydrocracking to break down larger hydrocarbons. Similarly, extracting bitumen from tar sands is more challenging and expensive than extracting liquid oil, and it generates about 15% more carbon dioxide emissions per gallon of gasoline produced.
The development of oil shale and tar sands resources has been an area of interest for energy companies and governments. In the United States, the Bureau of Land Management (BLM) is authorized to lease federal lands for oil shale and tar sands development under the Mineral Leasing Act of 1920. Companies such as Chevron Shale Oil Co., EGL Resources Inc., Shell Frontier, and ExxonMobil Exploration Co. have acquired leases for research, development, and exploration of oil shale resources. However, the environmental impact of extracting and refining oil from these sources needs to be carefully considered, especially regarding carbon emissions and water supply impacts.
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Bitumens and heavy oils
Bitumen is a low-grade form of crude oil, composed of complex, heavy hydrocarbons. It is thick and viscous and must be extracted from the ground with considerable effort and heat. Bitumen is a naturally occurring fossil fuel that can be found bubbling to the surface of the Earth in petroleum seeps, where it mixes with asphalt and tar. Bitumen is also the main fossil fuel component of oil sands.
Bitumen is a valuable fossil fuel resource, particularly in Canada, where large deposits are found in Alberta. In 2015, Canadian production and exports of non-upgraded bitumen exceeded that of synthetic crude oil, with over 1.3 million barrels exported per day, of which 65% went to the United States. Bitumen is often blended with other grades of bitumen, conventional crude oil, synthetic crude oil, and condensate to create a uniform product that can compete internationally with heavy oils such as Mexican Mayan or Arabian Dubai Crude.
The process of extracting and refining bitumen is complex. Crude oil is heated to high temperatures of around 200-300°C, which vaporizes the oil partially. This process, known as fractional distillation, separates the lighter components from the heavy components, with bitumen falling to the bottom of the distillation column. Further distillation under vacuum pressure is then used to obtain the bitumen product.
Bitumen has a variety of industrial applications. It can be processed directly into products such as gasoline, diesel fuel, and refined asphalt. It is also used in the construction industry, particularly for road paving and waterproofing roofs. Historically, bitumen was used for medicines, rust- and acid-proof paints, fireproof roofing, street paving, patent leather, and fence post preservatives.
Heavy oils are closely related to bitumen and are considered conventional oils with a high viscosity, high density, and significant nitrogen content. They are found at the margins of geological basins and are thought to be the residue of light oils that have degraded over time. Heavy oils are present worldwide, with the largest accumulation being the Venezuelan Orinoco heavy-oil belt, which contains 90% of the world's extra-heavy oil. Heavy oils are more challenging to extract and transport than conventional light oils, which has led to a decline in their production and a preference for lighter oils.
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Frequently asked questions
Fossil fuels are non-renewable energy sources that include coal, natural gas, and petroleum (or crude oil).
Other fossil fuels include coal products, derived gas, and petroleum products.
Coal comes in four main varieties: lignite, sub-bituminous, bituminous, and anthracite.
Petroleum products include gasoline, propane, kerosene, and jet fuel.
