煤层气的赋存状态及其影响因素

煤储层内的煤层气与常规天然气的赋存状态截然不同，基本上可划分为溶解态、游离态、吸附态，近期Ｃｏｌｉｎｓ指出类液态相的存在．在简要介绍了溶解态和游离态煤层气赋存规律之后，主要对吸附态煤层气及吸附等温线进行详细论述，同时对煤的吸附能力的控制因素进行了系统探讨．

Occurrence of Coalbed Methane in Coal_seam and Its Controls

The occurrence of coalbed methane in coal_seam is very different from natural gas in conventional reservoir. The occurrence of coalbed methane in coal_seam can be divided into three phases: dissolved phase, free phase and sorption phase. (Another phaseliquid_like phase was found by Collins in 1991). After the brief introduction on dissolved and free phase, the sorption phase and isotherm are discussed in detail. At last, the controls of sorption capacity in coal_seam have been introduced.