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以Ⅲ型有机质为主、处于低熟演化阶段的民和盆地侏罗系窑街组和雅布赖盆地侏罗系新河组泥页岩的实测含气量分别为0.32~0.40和0.67 m3/t,与美国圣胡安(San Juan)盆地的路易斯(Lewis)页岩的含气量的下限值接近.解吸气中,甲烷含量在76.60%~99.23%之间,甲烷和乙烷的碳同位素组成分别介于-53.4‰~-49.2‰和-36.0‰~-26.3‰,两套泥页岩的解吸气均属于低熟气或生物-热催化过渡带气.这表明中国西北地区中小型盆地普遍发育的以Ⅲ型干酪根为主、低成熟的侏罗系陆相泥页岩可能具有一定的页岩气勘探前景.
The measured gas content of type III organic matter in the Jurassic Yajie Formation in the Minhe Basin and the Shariot of the Xinhe Formation in the Yabra Basin in the low-maturity stage are 0.32-0.40 and 0.67 m3 / t, respectively Which is close to the lower limit of the gas content of the Lewis shale in the San Juan basin in the United States.The content of methane in the desorbed gas ranges from 76.60% to 99.23%. The carbon isotopes of methane and ethane With composition ranging from -53.4 ‰ to -49.2 ‰ and -36.0 ‰ to -26.3 ‰, respectively.The desorption gas from both shale samples belongs to low-mature gas or bio-thermo-catalytic transition gas.This indicates that small and medium-sized Basins of Type Ⅲ kerogen are generally developed in the basin. Low-maturity continental shale mudstone may have certain prospect of shale gas exploration.