煤层气作为一种非常规的特殊油气资源类型，在项目选区、效益评价以及开发等各个方面的理论及基本方法的研究方面，与常规天然气相比还处于相对不成熟的阶段。针对煤层气项目选区，提出了应重点考虑的3项关键技术指标（即煤层的含气量、含气煤层的渗透率和煤储层压力），并结合国内外煤层气勘探开发实际情况，总结出了煤层气项目评价常用的10项具体指标。针对煤层气项目经济效益评价的复杂性，重点介绍了求取煤层气经济可采储量的2种有效方法（即现金流量法和经济极限法），并结合实例对影响煤层气效益的主要因素进行了系统的分析，为煤层气经济效益分析与评价指出了有效途径。

Coal-bed Methane is a special type of unconventional natural gas resources. Its basic theories and methodology, such as selecting of the blocks, benefit evaluation, development and etc., are still at a relatively immature stage compared with the conventional natural gas. In this paper, aimed at selecting of the coal-bed methane blocks, we come up with three key technical indicators. Also, considering the actual situation of domestic and abroad coal-bed methane exploration and development, we conclude 10 specific indicators so as to provide effective help for coal-bed methane project blocks. Due to the complexity of coal-bed methane project evaluation, some factors which impact the benefits of coal-bed methane projects are analyzed systematically, for offering some approaches to economic analysis and evaluation of coal-bed methane projects. Coal-bed methane project evaluation is based on the economic recoverable reserves. In the paper, two ways to assess economic coal-bed methane reserves is presented, that is, the cash flow method and the economic limit method.