Ameer Randolph
Natural gas is a fossil fuel. It is found in underground rocks called reservoirs and has been used for lighting and cooking since the 1790s. Natural gas is made up of many compounds, the largest of which is methane, a powerful greenhouse gas. Other compounds include natural gas liquids (NGLs) and non-hydrocarbon gases such as carbon dioxide and water vapour. Natural gas is extracted through conventional drilling or unconventional methods like hydraulic fracturing or fracking. While natural gas is a major contributor to climate change, it is still widely used as a fuel and in the production of materials and chemicals.
| Characteristics | Values |
|---|---|
| Natural Gas | Fossil Fuel |
| Ancient plant material deposited in an oxygen-poor environment and cooked over millions of years by heat from the earth | |
| Found in underground rocks called reservoirs | |
| Contains methane, a potent greenhouse gas | |
| Contains carbon dioxide | |
| Contains water vapour | |
| Contains natural gas liquids (NGLs) | |
| Contains hydrocarbon gas liquids | |
| Contains compounds like ethane and butane | |
| Can be compressed to form CNG | |
| Can be liquefied to form LNG | |
| Can be purified to form RNG (biomethane) | |
| Fossil Fuel | Coal, Petroleum, Natural Gas, Oil Shales, Bitumens, Tar Sands, Heavy Oils |
| Can be burned in air or with oxygen derived from air to provide heat |
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What You'll Learn
Natural gas is a fossil fuel
Natural gas is primarily composed of methane (CH4), a potent greenhouse gas that is highly effective at trapping heat in the Earth's atmosphere. It also contains smaller amounts of other compounds, such as ethane, butane, carbon dioxide, and water vapor. The extraction of natural gas can be done through conventional methods, such as drilling wells, or unconventional methods like hydraulic fracturing, or "fracking."
Fracking is a process where energy companies pump a mixture of water, chemicals, and sand into rock formations under high pressure, causing the rock to break apart and release the natural gas contained within. This method has been widely used since the mid-20th century and has improved in efficiency due to significant investments and regulatory waivers. However, there are concerns about the secrecy surrounding the chemicals used in fracking and their potential impact on the environment.
Natural gas has been marketed as a convenient and affordable energy source, with campaigns promoting its use in cooking and influencing younger generations to view gas stoves positively. Additionally, terms like freedom gas and the perception of natural gas as a bridge fuel to a low-carbon economy have contributed to its popularity. Nevertheless, natural gas is a major contributor to air and water pollution and climate change. Its combustion releases greenhouse gases, particularly methane, which has a significant impact on global warming in the short term.
Despite the efforts to promote natural gas as a clean and safe alternative, it is essential to recognize that it is a fossil fuel. The proliferation of natural gas power plants and the increasing demand from electric power plants have led to higher customer bills, reliability issues, and accelerated climate change. As a society, we must advocate for and prioritize the utilization of clean energy resources, such as wind, solar, and advanced batteries, to power our present and future without harming our health or the planet.
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Natural gas extraction methods
Natural gas is found in underground rocks called reservoirs. These rocks have tiny spaces, called pores, that allow them to hold natural gas, as well as water and sometimes oil. A layer of impermeable rock, called a cap rock, traps the natural gas underground until it is extracted.
The extraction process for conventional natural gas involves drilling wells into the reservoir and relying on the natural pressure within the reservoir to push the gas to the surface. In some cases, gas producers may use fracking to extract natural gas. Fracking is a process in which energy companies pump a mixture of water, sand, and chemicals into the rock under high pressure. This breaks up the rock formation, allowing the gas to flow out of the pores and into wells that funnel the gas to the surface.
Fracking is often used to extract unconventional natural gas, which is found in tiny pores within shale, sandstone, and other types of sedimentary rock. Shale gas, tight gas, and coal bed methane are examples of unconventional natural gas. Unconventional gas is typically found deeper below the surface, making extraction more difficult and expensive.
Before drilling for natural gas, geologists use seismic surveys to locate the types of geologic formations that are likely to contain natural gas deposits. These surveys create and measure seismic waves in the earth to gather information about the underlying rock formations. If the results indicate that a site has the potential to produce natural gas, an exploratory well is drilled and tested. If the test results show that the site has enough natural gas to be profitable, one or more production wells are drilled.
Wells can be drilled vertically or horizontally into natural gas-bearing formations. Horizontal drilling allows access to more reserves with fewer wells installed. After drilling the "long hole," the drill pipe is removed, and a steel pipe is pushed to the bottom to create the "well casing," which is cemented in place. Tests are performed to ensure the pipe is impermeable before production can begin. A perforating gun is then lowered into the ground and fired into the rock layer, creating holes that connect the rock holding the natural gas to the wellhead.
Fracking fluid is then pumped at high pressure through the perforating holes to create thin cracks in the shale rock, freeing the natural gas trapped inside. The natural gas flows up to gathering pipelines and wells on the surface. However, it is important to note that fracking requires large amounts of water and can produce toxic or radioactive wastewater, which has led to bans on this method in some places.
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Natural gas composition
Natural gas is a fossil fuel formed from ancient plant and animal remains, or organic matter, that underwent changes over millions of years. It is found trapped in underground rocks, or reservoirs, which have tiny spaces called pores. Natural gas is extracted through drilling wells, a process known as hydraulic fracturing or fracking.
Natural gas is composed primarily of methane, a powerful heat-trapping greenhouse gas. It is a compound with one carbon atom and four hydrogen atoms (CH4). Methane comprises about 95% of natural gas. The remaining 5% includes small amounts of other gases, such as ethane, propane, butane, carbon dioxide, nitrogen, hydrogen sulfide, helium, and water vapour. These additional gases are considered impurities and are removed before natural gas is burned as fuel or used in manufacturing.
The composition of natural gas can vary depending on its source and location. For example, natural gas from shale gas or tight gas formations is referred to as unconventional natural gas and may have different compositions compared to conventional natural gas found in large underground reservoirs.
Before natural gas is distributed to end users, it undergoes an odorization process to enhance safety. In its natural state, natural gas is colorless and odorless, making it difficult to detect leaks. By adding compounds like mercaptan, which smells like rotten eggs, the presence of natural gas can be easily identified.
Natural gas is a highly versatile energy source used for heating, cooking, and electricity generation. However, it is important to note that it contributes to climate change and global warming due to its methane content, which has a significant heat-trapping effect in the atmosphere.
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Fossil fuels and climate change
Natural gas is a fossil fuel, formed from the decomposition of carbon-based organisms that died and were buried millions of years ago. Fossil fuels are the energy of the past, and with new technologies like wind and solar power, we can move towards a cleaner, more sustainable future.
Fossil fuels are a major contributor to climate change, accounting for over 75% of global greenhouse gas emissions and nearly 90% of all carbon dioxide emissions. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas that traps heat in our atmosphere, causing global warming and climate change. The average global temperature has already increased by 1°C, and warming above 1.5°C risks further sea level rise, extreme weather, biodiversity loss, and food scarcity. The IPCC warns that fossil fuel emissions must be halved within the next decade if we are to limit global warming to safe levels.
Natural gas, in particular, is a significant contributor to air pollution, water pollution, and climate change. It is composed mainly of methane, a powerful greenhouse gas that is 120 times more effective than carbon dioxide at trapping heat when it first enters the atmosphere. Leaks of methane during the extraction and transportation of natural gas can significantly accelerate global warming.
The burning of natural gas and other fossil fuels like coal and oil is impeding progress to limit climate change. Fossil fuel emissions continue to rise, and in 2023, emissions from fossil fuels reached a record high, with a 1.1% increase from 2022 levels. This is causing a range of impacts, from water scarcity and agricultural droughts to rising sea levels and expanding deserts.
To address climate change, a transition to renewable energy sources is necessary. While renewable energy sources like wind and solar power currently provide over a quarter of electricity globally, fossil fuel companies remain huge polluters, producing and selling fossil fuel products. Efforts to reduce emissions, such as the Paris Agreement, have been made, but more needs to be done to align with the necessary reductions in fossil fuel emissions.
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Fossil fuel alternatives
Natural gas is indeed a fossil fuel, and it contributes to climate change and air pollution. However, it releases about half of the greenhouse gases that burning oil or coal does. Thus, it can be a bridge fuel until we transition to greener energy sources.
There are many alternatives to fossil fuels, including renewable energy sources such as solar, wind, hydro, and geothermal. Renewable energy is derived from natural sources that can replenish themselves, such as wind, solar, tidal, or hydroelectric power. It is theoretically infinite, unlike fossil fuels, which will eventually run out. Additionally, renewable energy is now the most affordable source of power in most parts of the world, with over 90% of new renewable projects being cheaper than fossil fuel alternatives. By 2040, Africa could generate 10 times more electricity than it needs, entirely from renewables.
Nuclear power is another alternative to fossil fuels. It is derived from splitting uranium atoms in a controlled manner to create nuclear fission. Biomass, or biological material such as wood, plants, and compost, can also be used as an alternative to fossil fuels. Many coal-fired plants are being converted to biomass to reduce emissions. Hydrogen is also an alternative fuel, particularly for heavy transport such as ships and trucks.
The use of fossil fuel alternatives has grown exponentially in recent years, accounting for 23.2% of all energy sources for power generation in 2020. Clean energy sector jobs already outnumber fossil fuel jobs, employing almost 35 million people worldwide.
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Frequently asked questions
Natural gas is a fossil fuel energy source found in underground rocks called reservoirs. It is made up of many different compounds, the largest of which is methane, a powerful greenhouse gas.
Yes, natural gas is a fossil fuel. Other fossil fuels include coal, petroleum, oil shales, bitumens, tar sands, and heavy oils.
Natural gas is a major contributor to air pollution, water pollution, and climate change. It emits pollution and is a major producer of methane, a very powerful greenhouse gas.
