COAL BED METHANE

BASICS

• Coalbed methane (CBM or coal-bed methane)/ coalbed gas/coal seam gas (CSG), or coal-mine methane (CMM)^[2] is a form of natural gas extracted from coal beds
• CBM is natural gas trapped within coal formations, extracted by drilling holes into the seams.
• mainly methane and trace quantities of ethane, nitrogen, carbon dioxide 
• The term refers to methane adsorbed into the solid matrix of the coal. 
• It is called 'sweet gas' because of its lack of hydrogen sulfide.
• Unlike much natural gas from conventional reservoirs, coalbed methane contains very little heavier hydrocarbons such as propane or butane, and no natural-gas condensate. 
• It often contains up to a few percent carbon dioxide. 
• Some coal seams, such as those in certain areas of the Illawarra Coal Measures in NSW( Illawarra Coal Measures is a group of sedimentary rocks occurring in the Sydney), Australia, contain little methane, with the predominant coal seam gas being carbon dioxide.
• it has become an important source of energy in United States, Canada, Australia,

INDIAN SCENARIO

• Commercial CBM production in ONGC blocks is yet to start

LOCATIONS in india

•  CBM gas from existing wells at Parbatpur of the Jharia block

Location in world

• Australia
  • Commercial recovery of coal seam gas (CSG) began in Australia in 1996. As of 2013, coal seam gas, from Queensland and New South Wales, made up 10% percent of Australia's gas production. 
    • Bowen Basin
    • Surat Basin
    • Sydney Basin

• Canada

  • In Canada, British Columbia is estimated to have approximately 90 trillion cubic feet (2.5 trillion cubic metres) of coalbed gas.
  • Alberta, in 2013 the only province with commercial coalbed methane wells recoverable coalbed methane.
  • Coalbed methane is considered a non-renewable resource, although the Alberta Research Council, Alberta Geological Survey and others have argued coalbed methane is arenewable resource because the bacterial action that formed the methane is ongoing.
    • Western Canadian Sedimentary Basin

• United Kingdom

  •  estimated to 2,900 billion cubic meters little as 1%might be economically recoverable.
    
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• United States
  •         United States coalbed methane production in 2011 was 1,76 trillion cubic feet (TCF), 7.3 percent of all US dry gas production that year.
  •  CBM production came from the Rocky Mountain states of Colorado, Wyoming, and New Mexico.
• Kazakhstan
  •      Kazakhstan could witness the development of a large coalbed methane (CBM)