Abstract

Coalbed Methane (CBM) is a form of natural gas extracted from coal beds. In recent decades it has become an important source of energy in many countries. The term refers to methane adsorbed into the solid matrix of the coal. CBM reservoir is distinct from typical sandstone or other conventional gas reservoir, as the methane is stored within the coal by a process called adsorption. In this paper, the effect of various petro-physical parameters like porosity and permeability on CBM production has been estimated. It has been noticed that the production trend behaves differently for increasing porosity with constant permeability and increasing permeability with constant porosity. While the permeability increase enhances the rate of production and advances the time of start of production, the porosity increase delays the time of start of production while keeping the rate of production more or less similar.