Mercedes Mullins
Unconventional fossil fuels are those that require novel methods for extraction, as opposed to conventional fossil fuels, which can be extracted using standard methods. Unconventional fossil fuels are typically more expensive to produce, but advancements in technology have made them more economically viable, leading to an increase in their production. The two forms of unconventional fossil fuels are tight gas and shale gas.
| Characteristics | Values |
|---|---|
| Definition | Unconventional fossil fuels are those that are more difficult and expensive to extract than conventional fossil fuels. |
| Conventional vs. Unconventional | Conventional fossil fuels are found in "normal" or "easy" reservoirs with high porosity and permeability, allowing for standard extraction methods. Unconventional fossil fuels are found in reservoirs with poor permeability and porosity, requiring specialized techniques and tools for extraction. |
| Examples | Shale gas, tight gas, tight oil, oil shale, coal bed methane, bitumen |
| Extraction Methods | Hydraulic fracturing, horizontal drilling, steam-assisted gravity drainage, in situ methods (e.g. steam or solvent injection), surface or underground mining |
| Environmental Impact | Unconventional fossil fuels have higher life cycle emissions than conventional fossil fuels. For example, life cycle emissions for shale gas are estimated to be 6%-43% higher than conventional natural gas. |
| Economic Impact | Unconventional fossil fuels are typically more expensive to produce, often in the $40-$80/barrel range. However, advances in technology have made these fuels more economically recoverable, impacting global oil supply, demand, transport, energy access, and national economies. |
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What You'll Learn
- Unconventional fossil fuels are harder to extract and require innovative technologies
- They are more expensive to produce, often in the $40-$80/barrel range
- They are not chemically different from conventional fossil fuels
- They are found in unconventional deposits, such as oil sands and shale rock
- They are non-renewable and derived from ancient organic materials
Unconventional fossil fuels are harder to extract and require innovative technologies
Unconventional fossil fuels are harder to extract than their conventional counterparts. This is due to their position underground and the nature of their reservoirs. These factors necessitate the use of innovative technologies to access them. Conventional oil and gas come from formations that are straightforward to extract from, and standard methods can be used to remove the fuel from the deposit economically. In contrast, unconventional oil and gas resources are often trapped in reservoirs with poor permeability and porosity. This makes it extremely difficult or impossible for the fuel to flow through the pores and into a standard well.
Unconventional fossil fuels include shale oil, tight gas, and shale gas. Shale oil is a sedimentary rock with deposits of organic compounds called kerogen, which has not undergone enough geologic pressure, heat, and time to become conventional oil. Oil shale can be extracted through surface or underground mining and then heated to a high temperature to obtain the oil. This process requires a lot of water and energy, resulting in a yield similar to oil sand production and lower than that of conventional oil.
Tight gas is found in low-permeability rock formations, requiring horizontal drilling and hydraulic fracturing for efficient extraction. Hydraulic fracturing, or fracking, involves injecting a high-pressure mixture of water, sand, and chemicals into rock formations to release the trapped gas or oil. This process is also used to extract shale gas, which is trapped within shale rock formations.
The extraction of unconventional fossil fuels is more costly than traditional methods, but it allows for the production of oil and gas from resources that were previously uneconomic to extract. Advances in technology have made these resources more accessible, triggering changes in global oil supply, demand, and transport. However, it is important to note that the life cycle emissions for unconventional oil and shale gas are often higher than those of conventional fuels.
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They are more expensive to produce, often in the $40-$80/barrel range
Unconventional fossil fuels are typically more expensive to produce than conventional fossil fuels. This is mainly due to the complex and specialised extraction methods required for unconventional sources. Conventional oil or gas comes from formations that are straightforward to extract from, and standard methods can be used to remove the fuel from the deposit economically. In contrast, unconventional oil and gas resources are often trapped in reservoirs with poor permeability and porosity, making it difficult or impossible for the fuel to flow through the pores and into a standard well.
To produce unconventional fossil fuels, specialised techniques and tools are required. For example, the extraction of shale oil, tight gas, and shale gas must include a hydraulic fracturing step to create cracks for the oil or gas to flow through. In the oil sands, in situ deposits must utilise steam-assisted gravity drainage to extract thick bitumen from underground. These methods are more costly than those used for conventional fossil fuels.
The cost of producing unconventional fossil fuels can range from $40 to $80 per barrel. Despite the higher cost, the production of unconventional oil is increasing due to rising demand for fossil fuels and decreasing reserves of conventional sources. Advances in technology have made previously inaccessible oil reserves more economically recoverable, triggering changes in global oil supply, demand, and transport. This has significantly impacted the global market, with the US transitioning from a historical oil importer to a net exporter of oil.
The higher cost of producing unconventional fossil fuels can have economic implications for energy companies and consumers. The increased cost of extraction may be passed on to consumers in the form of higher prices for energy products. Additionally, the development of new technologies and extraction methods requires significant investment, which may impact the profitability of energy companies. However, the exploitation of unconventional fossil fuels provides access to vast energy resources, ensuring a more stable and diverse energy supply for the future.
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They are not chemically different from conventional fossil fuels
The two forms of unconventional fossil fuels are shale gas and tight gas. They are not chemically different from conventional fossil fuels. The distinction between unconventional and conventional fossil fuels lies in the ease of extraction and the position of the deposits underground. Conventional fossil fuels are found in “normal” or straightforward formations, whereas unconventional fossil fuels are found in reservoirs with poor permeability and porosity, making extraction challenging and costly.
Unconventional fossil fuels, such as shale gas and tight gas, require innovative technologies like hydraulic fracturing to unlock their energy potential. Hydraulic fracturing, or fracking, involves injecting a high-pressure mixture of water, sand, and chemicals into rock formations to release the trapped gas or oil. This process creates cracks in the rock, allowing the hydrocarbons to flow and be collected.
Shale gas is a form of unconventional fossil fuel that is trapped within shale rock formations. It can be found at varying depths below the surface, with higher organic matter content. If shale gas is buried deeply, it is known as "dry gas," primarily composed of methane. On the other hand, if it is buried less deeply, it is referred to as "wet gas," which includes other hydrocarbons like ethane, butane, and propane.
Tight gas is another form of unconventional fossil fuel found in low-permeability rock formations, similar to those of tight oil. Tight gas reservoirs have low porosity and permeability, making it difficult for the gas to flow through the pores. The extraction of tight gas typically involves horizontal drilling and hydraulic fracturing to enhance its flow.
While unconventional fossil fuels are more challenging and expensive to extract, advancements in technology have made them increasingly accessible. The development of these resources has significant economic potential, as a large portion of oil and gas resources is estimated to exist in unconventional deposits. However, it is important to note that the life cycle emissions for unconventional fossil fuels are generally higher than those of their conventional counterparts.
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They are found in unconventional deposits, such as oil sands and shale rock
Unconventional fossil fuels are found in deposits that differ from traditional sources of oil, coal, and natural gas. These unconventional deposits include oil sands and shale rock, which offer vast reserves of oil and natural gas that were previously inaccessible or uneconomical to extract.
Oil sands, also known as tar sands, are a mixture of sand, clay, water, and bitumen, a heavy and viscous form of petroleum. The two most significant deposits of oil sands in the world are located in
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They are non-renewable and derived from ancient organic materials
Unconventional fossil fuels are non-renewable and derived from ancient organic materials. Conventional fossil fuels, such as crude oil, coal, and natural gas, are also non-renewable, meaning they are not naturally replenished within a human timescale. They are derived from ancient fossilized organic matter that has been buried deep underground over millions of years.
Unconventional fossil fuels, on the other hand, include sources like shale gas and tight gas. These resources are found in reservoirs with poor permeability and porosity, making it challenging for the fossil fuels to flow through the pores and reach standard wells. As a result, unconventional fossil fuels require innovative technologies and specialized techniques for extraction.
Shale gas, for instance, is trapped within shale rock formations at varying depths. It has a high organic matter content, and its extraction requires advanced technologies like hydraulic fracturing or "fracking." This process involves injecting a high-pressure mixture of water, sand, and chemicals into rock formations to release the trapped gas or oil.
Tight gas is another form of unconventional fossil fuel found in low-permeability rock formations. Similar to shale gas extraction, tight gas extraction also employs hydraulic fracturing and horizontal drilling methods. These techniques allow access to a larger area within the reservoir and create fractures for the gas to flow through.
The distinction between conventional and unconventional fossil fuels primarily lies in the ease of extraction and the production methods employed. Conventional fossil fuels are typically found in "normal" or straightforward formations that can be extracted using standard methods, whereas unconventional fossil fuels are more challenging to access and require specialized technologies.
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