The need for increasing energy supply and reliance on fossil fuels

The global demand for energy continues to rise as populations grow and economies develop. Despite advancements in renewable energy sources, fossil fuels such as oil, gas, and coal remain the dominant providers of energy worldwide.

The pressure to secure energy supplies often leads to exploration in ecologically sensitive areas, where the risk of environmental damage is high.

Characteristics and economic benefits of conventional oil and gas reserves

Conventional oil and gas reserves refer to energy resources that can be extracted using straightforward drilling techniques. These reserves are typically located in accessible geological formations, making the process both rapid and cost-effective compared to other methods.

Features of conventional reserves

• Ease of extraction - Drilling directly into reservoirs allows for quick access to oil or gas.
• Cost efficiency - The technology and infrastructure required are relatively inexpensive, reducing overall production costs.

Economic advantages of conventional reserves

• Reduction in energy imports - Countries with domestic reserves can lower their dependency on foreign energy, saving significant costs.
• Revenue from exports - Nations with surplus oil or gas can export these resources, boosting national income.
• Investment and employment - Energy companies often invest heavily in regions with reserves, creating jobs. For instance, a company operating in a northern region might invest hundreds of millions and employ over 3,000 local workers.

Environmental costs of conventional oil and gas extraction

While conventional oil and gas extraction offers economic benefits, it comes with significant environmental drawbacks. The process disrupts natural landscapes and ecosystems, leading to long-term ecological damage both on land and in marine environments.

Ecological consequences of conventional extraction

• Land disruption - Clearing areas for pipelines, roads, and drilling sites destroys fragile habitats and alters landscapes.
• Biodiversity loss - The destruction of habitats reduces the variety of species in affected regions, threatening ecological balance.
• Marine life impacts - Offshore drilling creates noise and vibrations that interfere with the communication and navigation of marine species like whales and dolphins.
• Pollution increase - Opening up remote areas for drilling leads to higher levels of air, soil, and water pollution, harming both wildlife and human communities nearby.

Features and extraction methods of unconventional gas and oil reserves

Unconventional gas and oil reserves are more challenging to access than conventional ones, requiring advanced technology and complex methods. These reserves are often trapped in less permeable materials or located in difficult terrains, making extraction slower and more expensive.

Two prominent examples of unconventional reserves are shale gas and tar sands, each with distinct extraction methods and environmental challenges.

Shale gas extraction

Shale gas is a form of natural gas trapped within shale rock formations deep underground.

Extraction method (fracking):

• Hydraulic fracturing, or fracking, involves pumping high-pressure liquid into the rock to create fractures.
• This releases the gas, which is then collected at the well surface.

Tar sands extraction

Tar sands contain bitumen, a heavy form of oil that can be refined into usable petroleum products.

Extraction method (mining):

• Surface mining is commonly used, where tar sands are dug up and transported to processing plants.
• Water and chemicals are then applied to separate the bitumen from the sand.

Environmental impacts of shale gas and tar sands extraction

The extraction of unconventional resources like shale gas and tar sands has severe environmental consequences. These methods often cause widespread habitat destruction and pollution, posing significant threats to ecosystems and human health.

Environmental effects of shale gas extraction

• Groundwater contamination - Chemicals used in fracking liquid can seep into underground water sources, polluting drinking water supplies. In extreme cases, contaminated tap water has been known to ignite.
• Habitat destruction - Clearing land for drilling pads and infrastructure disrupts local ecosystems, displacing native wildlife.
• Ecosystem disruption - The overall impact of fracking activities affects the balance of local flora and fauna, leading to population declines.

Environmental effects of tar sands extraction

• Large-scale habitat loss - Mining operations require extensive land clearance, devastating natural habitats and reducing living spaces for organisms.
• Biodiversity reduction - Loss of habitat and food sources leads to a decline in species diversity within affected areas.
• Liquid waste pollution - Processing tar sands generates significant amounts of toxic liquid waste, which, if not managed properly, can contaminate water supplies.
• Water resource impact - Improper handling of waste can pollute rivers and groundwater, threatening both environmental and human health.