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在研究沁水盆地演化史和石炭二叠系主要煤储层埋藏史的基础上，讨论了煤层生气史和阶段生气量，提出了有效生气阶段和有效阶段生气量的概念；认为煤层生气史和有效阶段生气量是关键的控气地质因素之一，有效生气阶段越晚和有效阶段生气量越大，则煤层的含气量越高。
On the basis of studying the evolution history of the Qinshui Basin and the burial history of the main coal reservoirs in the Permo-Carboniferous, the authors have discussed the gas generation history and the gas generation in the coal seam and put forward the concept of effective gas generation and effective gas generation. Active gas generation is one of the key geologic factors controlling gas. The later the effective gas generation stage and the larger gas generation in the active stage, the higher the gas content in the coal seam is.