Coalbed methane (CBM) – also known in Australia as coal seam gas (CSG) -- natural gas that is stored (‘adsorbed”) in deeply buried coal seams. CBM is pipeline-quality gas that requires no or minimal processing prior to sale. The presence of methane is well known from its occurrence in the coal mining industry, particularly underground mining where it can present serious safety risks. In fact, CBM production began as a technology for improving the safety and productivity of underground coal mining and preventing explosions. Not only does it provide the same service now, it also decreases emissions of greenhouse gas from coal mines and decreases air pollution because it is a clean-burning fuel. Chemically, CBM is similar to other sources of natural gas (about 95% pure methane) and can be sold into any market. CBM is a “sweet gas” as it generally does not contain hydrogen sulfide and is considered to be more environmentally friendly than oil, coal or even conventional natural gas. CBM contains very little heavier hydrocarbons such as propane or butane, and no natural gas condensate which is often found in conventional natural gas. CBM may contain carbon dioxide, typically several percent or less.
Posted on: Wed, 09 Oct 2013 04:23:55 +0000
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