本文件调查了世界各地煤层气的质量标志，并分析了ISO/TC 193采样、测试和计算方法标准是否适用于煤层气。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document surveys the quality designation of CBM all around the world, and analyses whether ISO/TC 193 standards for sampling, test and calculation methods are applicable to CBM.All current amendments available at time of purchase are included with the purchase of this document.