But it will fail to recognize the gasbearingbed buried deeper by the two methods as its porosity log feature is not obvious, especially when density porosity is lower than neutron porosity.
The main factors of influencing coal-bedgas production are permeability, thickness, and gas-bearing volume of the coal-bed.
影响煤层气产量的主要因素是煤层渗透率、煤层厚度及含气量。
3
The porosity and permeability of coal-bearing strata have important influence to the exhaust and mining of coal bedgas, but the production of coal bed gas is precondition of its richen.