Study on the measurement method of coalbed gas contents

Abstract：The paper established indoor coalbed gas contents desorbed simulation experiment, and carried out the whole process with simulation experiment: from coal seam drilling to packing to desorbed simulation for the coal core sample. It is discovered that the characteristic curve of coallbed gas contents in the whole desorbed process is asymmetric"S"type, correcting the traditional idea of "the coal sample at desorbed initial stage, gas desorbed contents is to present the line form relation with gas desorbed time square root."Four kinds of calculation methods:USBMs method, Polynomial method, Smith & Williamss method, and curve method are evaluated.

Keyword：USBMs method;polynomial method;smith & williamss method;curve method;