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根据沁水盆地南部3号煤吸附等温线及实测含气量,部分钻井吸附气含量达高饱和到饱和状态,这种高饱和度高含气量很难从理论上得到解释,而且该地区并不具备后期热成因气和生物成因等气源补充的条件,文中提出地史时期超压是促成现今煤层气藏高饱和度的主要原因．早自垩世煤系源岩大量生气,由于较好的顶底板条件及向斜核部的构造部位,煤层气藏具有超压和饱和含气特征,晚白垩世以后煤层气藏急剧抬升,在温度和压力降低过程中,超压吸附气转化为常压或欠压吸附气而使得现今煤层气藏维持高饱和度高含气量的状态．
According to No. 3 coal adsorption isotherm in the southern part of Qinshui Basin and the measured gas content, the adsorption gas content of some drilling wells reaches high saturation to saturation. This high saturation and high gas content is difficult to explain theoretically, and the region does not have Post-pyrogenic gas and biogenic gas sources such as the conditions of supplement, proposed in the geologic period of overpressure is to promote the current high saturation of coal-bed methane reservoir is the main reason. Since the source rocks of the Early Cretaceous coal series were very angry, due to the better roof and floor conditions and the structural parts of the syncline core, the CBM reservoirs are characterized by overpressure and saturation gas content. After the Late Cretaceous, During the process of temperature and pressure reduction, the overpressure adsorbed gas is converted into atmospheric or underpressure adsorbed gas to make the present coalbed methane reservoirs maintain a state of high saturation and high gas content.