煤层气生成与煤层气富集 Ⅰ.有效阶段生气量与煤层气富集

GENERATION AND ENRICHMENT OF COALBED METHANE ⅠGAS YIELD IN EFFECTIVE STAGE AND CONCENTRATION OF COALBED METHANE

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 detail study on the burial history of PermoCarboniferous main coal seams and evolution history of Qinshui basin,the gas generation history and stage gas yield are discussed in detail,and “effective gas generation stage”and “gas yiele in effective stage”are introduced in this paper.The authors consider that the gas generation history and the gas yield in effective stage of seams are the key gascontrolling geological factors,and that the later the generation stage and the larger the gas yield,the higher the gas content of coal seams.