废弃矿井煤层气来源及赋存状态

废弃矿井中赋存的煤层气作为一种资源逐渐成为人们关注的焦点。其赋存状态与原始状态煤层中煤层气的赋存状态相同，由游离态、吸附态和溶解态构成，游离态占主体，吸附气次之，溶解气最少。分析了废弃矿井煤层气的来源，指出其主要来源有4个：煤柱及残留煤体，临近未采煤层，围岩中的游离气和吸附气，生物成因煤层气；并提出不同地质背景、不同煤阶、不同采煤方法和煤层发育特征决定了废弃矿井煤层气的主要来源和富集程度。

The Origins and Occurrence States of Coal-bed Methane in Abandoned Mine

Coal-bed methane existing in the abandoned mines, being as a kind of resource, is the focus of attention. The occurrence state of coal-bed methane in abandoned mines is similar to that in undistributed coal-beds, which is also made up of ionized state, adsorbed state and dissolved state: the ionized state takes the first place, adsorbed state is second place and dissolved state is the least. There are four main origins of coal-bed methane in abandoned mines including the coal pillars and residual coal-bodies, adjacent intact coal-beds, ionized gas and adsorbed gas in wall rock, and biogenic gas. The main origins and the enrichment degrees of the coal-bed methane in abandoned mines depend on the geological background, coal ranks, mining methods and the developing characteristics of the coal beds.