我国高低煤阶煤层气成藏的差异性

从煤层气成藏的气源条件、煤层的储集能力、煤层的物性、煤层的水文地质条件和成藏过程 等方面，分析了高煤阶煤层气和低煤阶煤层气成藏的差异性。在分析过程中考虑了构造热事 件对高煤阶煤层气藏物性的改造作用和生物气、游离气在低煤阶煤层气成藏过程中的作用。 最后,在分析煤层气成藏差异性的基础上,得出了高低煤阶煤层气藏的优点和缺点,指出中 国高煤阶煤层气和低煤阶煤层气均有开采价值。

FORMING DIFFERENCES BETWEEN HIGH AND LOW COAL RANK COALBED METHANE RESERVOIRS

The differences between high and low coal rank reservoirs are analyzed from such aspects as the conditions of the coalbed methane's fountain,the coalbed adsorption capacity,the hydrogeologic and physical property of coal beds,and the reservoir forming process.The analysis considered the improvement of the coalbed physical property by heat in structural movements in high coal rank reservoirs and the important role of biogas and free gas in low rank CBM reservoirs.The disadvantages and advantages of the two kinds of reservoirs have been given.