Coal bed Methane near-liquid state; within coal due to adsorption

Q.  Which of the following is/are true regarding Coalbed methane (CBM)?

1) The methane is in a near-liquid state.
2) The methane is stored within the coal due to a phenomenon called absorption.
- Published on 09 Sep 16

a. Only 1
b. Only 2
c. Both 1 and 2
d. Neither 1 nor 2

ANSWER: Only 1
 
  • Coalbed methane is distinct from a typical sandstone or other conventional gas reservoir, as the methane is stored within the coal by a process called adsorption.
  • The methane is in a near-liquid state, lining the inside of pores within the coal (called the matrix).
  • The open fractures in the coal (called the cleats) can also contain free gas or can be saturated with water.
  • Gas contained in coal bed methane is mainly methane and trace quantities of ethane, nitrogen, carbon dioxide and few other gases.
  • Intrinsic properties of coal as found in nature determine the amount of gas that can be recovered.

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