煤岩吸附曲线在煤层气勘探开发中的应用

煤岩吸附曲线是描述在一定条件下煤对气体的吸附（解吸）的性质，是煤层地质评价、试采措施及评估的重要资料。综合国内外几种不同类型的解吸曲线，阐述其在煤层气勘探开发中的参考价值，并提出了以下看法：①有利于煤层气开发的解吸曲线应该具有含气饱和度高、地解压差小、曲线斜率大的特点；②煤层渗透率是实现煤层降压，煤层气脱附和产出的重要因素；③鉴于实验求得的煤岩吸附曲线条件的限制，应使其更接近于实际。

APPLICATION OF COAL ADSORPTION CURVE TO CBM EXPLORATION AND DEVELOPMENT

The coal adsorption curve is used to describe the characteristics of adsorption (desorption) of coal to gas under certain conditions, and also the important data for the coal seam geological evaluation, the measures and assessments of production test. Therefore, combining several different kinds of desorption curves at home and abroad, the paper discussed the reference value of curves in CBM (coalbed methane) exploration and development, and put forward some points of view. Firstly, desorption curves favorable for the CBM development should have characteristics of high gas saturation, small formation pressure desorption pressure difference and large curve slope; Secondly, permeability of coal seam is the key factor to realize the decompression of coal seam as well as the desorption and production of coalbed methane; Thirdly, considering the limitation of laboratory conditions to obtain the coal adsorption curve, studies should be strengthened so as to make it much closer to actual situation and guide field production.