煤层含气量测定方法探讨

Study on the measurement method of coalbed gas contents

建立室内煤层含气量解吸模型实验,实现了煤心样品从钻开煤层到装罐结束,直至解吸结束的全过程模拟实验,发现煤样全过程解吸特征曲线为不对称的"S"型,修正了"煤样在解吸初期,气体解吸是与解吸时间的平方根呈线形关系"的传统观念,评价了直线回归、多项式回归、史威法和曲线拟合方法四种计算方法的优缺点.

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.