Is coal seam gas unconventional?
There are several types of unconventional gas, including shale gas and tight gas, which occur in reservoirs with very low permeability compared to conventional reservoirs. … The other form of unconventional gas is coal seam gas, where methane gas is trapped within the coal seam under pressure by overlying formations.
Is coal seam gas fracking?
In some cases hydraulic fracturing, or ‘fracking’, is used to extract coal seam gas. Hydraulic fracturing is the process of injecting fluid under high pressure into a coal seam to widen existing fractures and create new ones.
What is the difference between coal seam gas and natural gas?
Conventional natural gas and CSG are chemically similar. CSG is almost pure methane; conventional gas is around 90 per cent methane with ethane, propane, butane and other hydrocarbons making up the remainder. The difference between CSG/shale gas and conventional gas is the type of geological rock they are found in.
Is gas cleaner than coal?
Natural gas is a relatively clean burning fossil fuel
Burning natural gas for energy results in fewer emissions of nearly all types of air pollutants and carbon dioxide (CO2) than burning coal or petroleum products to produce an equal amount of energy.
How do you extract gas from coal?
The process involves pumping oxygen and steam through a small borehole into the coal seam to produce a small and controlled combustion. Unlike coal-bed methane, therefore, the actual coal is converted from a solid state into gas.
What’s the difference between shale and coal?
Shale gas is known as the cleanest fossil fuel, since it burns roughly half carbon dioxide and three fourths less nitrogen oxide than coal and almost no sulfur dioxide, carbon monoxide, black carbon, particulates, and mercury (Nature, 2009).