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Oil pollution is a significant environmental concern, with thousands of minor and several major oil spills occurring annually. These spills can result from various sources, including accidents during drilling, transportation, or refining processes, as well as natural seepage from the ocean floor. Oil spills have severe ecological and economic impacts, damaging aquatic life, bird and mammal habitats, and coastal ecosystems. They also affect tourism, commerce, and human health, with toxic chemicals in crude oil causing adverse effects when inhaled or ingested. Oil pollution is a complex issue that requires coordinated responses, technological advancements, and preventive measures to mitigate its immediate and long-term consequences.
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What You'll Learn
Oil spills from tankers, offshore platforms, drilling rigs, and wells
Oil spills are a form of pollution that can occur anywhere oil is drilled, transported, or used. Oil spills from tankers, offshore platforms, drilling rigs, and wells can have severe environmental, economic, and social consequences. These spills can harm sea creatures, ruin recreational areas, and make seafood unsafe to eat.
Oil spills from tankers are a common cause of marine oil spills. Tankers transport crude oil, which is the liquid remains of ancient plants and animals, and refined petroleum products such as gasoline and diesel fuel. Accidents involving tankers can result in the release of large quantities of oil into the ocean. For example, in 2002, a ship sank off the coast of Galicia, spilling 77,000 tonnes of heavy fuel oil and causing Spain's worst marine ecological disaster. In another incident, the Iranian-owned tanker Sanchi collided with a Chinese cargo ship near Shanghai, resulting in the spill of 136,000 tonnes of oil.
Offshore platforms and drilling rigs are another source of oil spills. A prominent example is the Deepwater Horizon disaster in 2010, where an explosion killed 11 people and resulted in the release of approximately 134 million gallons of oil into the Gulf of America. Another example is the Ixtoc I drilling rig accident in 1979, which caused a spill of over half a million tons of oil into Mexican waters. Accidental spills from oil platforms account for approximately 3% of oil spills in the oceans, and they can continue for months until relief wells are drilled.
Wells are also a source of oil spills. In 2004, Taylor Energy's MC20 oil production platform collapsed in an underwater mudslide caused by Hurricane Ivan, resulting in a significant oil spill in the Gulf of America. Oil spills can have immediate and long-term impacts on the environment and human health, including negative effects on respiratory and reproductive health, liver damage, and immune system damage. The clean-up and restoration of oil spills can be challenging and costly, requiring sound science and specialized tools to effectively contain and remove the spilled oil.
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Oil spills from pipelines
There are several reasons for pipeline oil spills, including damage during excavation operations, metal failure, improper operation, and corrosion. These spills can have severe environmental, economic, and social consequences. For example, the Keystone Pipeline has had at least three significant spills in the last five years, with one spill in 2017 releasing approximately 407,000 gallons of crude oil into the surrounding farmland. This particular spill was caused by a crack in the pipeline's exterior, likely due to a vehicle during installation.
Another notable incident occurred in 2019 near Edinburg, North Dakota, where a pipeline leak affected almost 209,100 square feet of land. The GAO reported that 4,515 barrels of oil were released, equivalent to approximately 383,000 gallons. This incident was attributed to a pipe manufactured with an atypical seam, resulting in a severe crack.
It is important to address and mitigate the impacts of oil spills from pipelines to prevent further environmental degradation and ensure the safety of ecosystems and communities. This includes implementing improved safety measures, such as those mentioned by TC Energy in the wake of the Keystone Pipeline spills.
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Land-based oil spills
Oil pollution is a disastrous form of environmental damage that can cause both short- and long-term harm to local ecosystems. Oil spills are often the result of human activity and can have severe environmental and economic consequences. While the term is usually given to marine oil spills, where oil is released into the ocean or coastal waters, spills may also occur on land.
The largest land-based oil spill in history, and Asia's worst, occurred in Uzbekistan on March 2, 1992. A blowout at a well resulted in oil spewing into the valley near Fergana. The oil ignited and burned for two months before the well pressure decreased. Of the estimated 88 million gallons released, most was protected from the fire by berms and dikes.
Another notable land-based oil spill occurred in the Russian Arctic, caused by a breach in a corroded oil pipeline. Oil pooled around the rupture site for eight months, contained by a dike. However, the dike eventually gave way, releasing roughly 84 million gallons of oil into the Kolva River. The oil tainted approximately 186 square kilometres of tundra and wetlands.
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Oil pollution from ports
Oil pollution is one of the most environmentally disastrous events, with both short- and long-term effects on local ecosystems. Oil spills can harm sea creatures, ruin beaches, and make seafood unsafe to eat. They can also have severe economic and social consequences, including increased fire hazards and the potential closure of beaches, parks, and fisheries.
Oil spills in ports are relatively common due to the large volume of boats. While smaller spills may not be as well-documented in the media as larger events, they can still have damaging economic repercussions and require expensive and time-consuming management, disrupting port activity. During the cleanup process, it is important to ensure that the oil does not get stuck under the quayside, as this could act as a continual source of contamination.
The sources of oil spills in ports can include operational discharges of oily tank washings from tankers, which was a more frequent issue in the past before the implementation of improved tank-cleaning procedures. Oil spills can also be caused by human error, natural disasters, technical failures, or deliberate releases. In the case of the MV Wakashio oil spill off the coast of Mauritius in 2020, the ship deliberately discharged bilge water containing oil to maintain stability, resulting in oil pollution.
To prevent the spread of oil spills in ports, all boats entering or leaving the port must be closely managed. Specialist cleaning contractors are also hired to clean the various port structures, and techniques such as booms, skimmers, in situ burning, and chemical dispersants are used to contain and remove the oil. However, cleanup activities can never remove 100% of the spilled oil, and it is important to carefully consider the potential impacts on sensitive habitats during the cleanup process.
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Oil pollution from natural seepage
Oil pollution is a form of environmental contamination caused by the release of liquid petroleum hydrocarbons into the environment, particularly the marine ecosystem. While oil spills are often the result of human activity, natural seepage of crude oil can also contribute to oil pollution.
Natural seepage occurs when crude oil and natural gas leak out of the ground through fractures and sediments and enter the ocean at areas known as "seeps". These seeps are found on the ocean floor and can result in oil slicks that spread and drift with winds and currents, forming miles-long lines of black, brown, and tan oil. Over time, as the oil drifts away from the seeps, it can form tar balls and mats that may come ashore.
The annual global oil seepage rate is estimated to be between 200,000 and 2,000,000 tonnes, with the Gulf of Mexico and southern California being two of the four regions offshore North America with known seeps. The seeps in these two regions alone contribute about 160,000 tonnes of petroleum to North American waters each year. In southern California, the seeps contribute about 5 million gallons of oil to the ocean annually, with wide year-to-year variations.
The impact of natural seepage on the ocean floor is not fully understood. While natural seepage can result in environmental contamination, the oil from natural seeps is also formed from the decay of buried fossil remains over millions of years. Some researchers have found that microbes can act on this oil, reducing its impact on the environment.
In comparison to anthropogenic inputs of petroleum to the oceans, the natural production of non-petroleum hydrocarbons by marine plankton is estimated to be significantly higher. These biogenic hydrocarbons are an important component of the background concentration of hydrocarbons in the marine environment but are well dispersed and not considered a significant source of marine pollution.
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Frequently asked questions
Oil pollution is the release of liquid petroleum hydrocarbons into the environment, especially the marine ecosystem, due to human activity. It is a form of pollution that can cause both short- and long-term damage to local ecosystems.
Oil pollution can be caused by human error, natural disasters, technical failures or deliberate releases. Sources of oil pollution include improper disposal of drilling muds, shipping and terrestrial traffic accidents, tank washing and oil ballast discharges, depot leakage, and failure or rupture in oil pipelines. Oil spills can also occur during the release of crude oil from tankers, offshore platforms, drilling rigs, and wells.
Oil pollution can have severe environmental consequences. It can harm sea creatures, make seafood unsafe to eat, and damage plant life. Oil spills can penetrate the structure of the plumage of birds and the fur of mammals, reducing its insulating ability and making them more vulnerable to temperature changes and less buoyant in the water. Oil pollution also reduces the level of dissolved oxygen in the water and prevents sufficient sunlight from penetrating the surface, affecting aquatic life.
