于聪,胡国艺,陈瑞银
Yu Cong,Hu Guo-yi,Chen Rui-yin
摘要: 为了研究不同煤系烃源岩(煤、暗色泥岩和炭质泥岩)生气差异,对三者进行了高压釜热模拟实验,并对热模拟气进行了组分分析、碳氢同位素分析和轻烃地球化学分析。实验结果表明:煤的产气率高于暗色泥岩和炭质泥岩,并在热模拟初期阶段产生大量CO2气体,煤在低温阶段的CO2产气量可达20%;暗色泥岩热模拟气甲烷含量在整个热模拟阶段都处于领先地位,炭质泥岩的C2—C4烷烃气的含量高于煤和暗色泥岩,煤生成的非烃气体含量最多;在整个热模拟阶段,煤热解气的碳、氢同位素略重于暗色泥岩和炭质泥岩热模拟气(δ13C2煤>δ13C2暗泥>δ13C2炭泥),热模拟温度高于500℃后,热模拟气出现碳同位素序列倒转现象;在轻烃产物中,煤热模拟气具有较高含量苯、甲苯以及2,3-甲基戊烷,而炭质泥岩热模拟气具有较高含量的2,4-甲基戊烷。将热模拟实验结果应用到苏里格气田,可以得到如下启示:①苏里格气区煤系烃源岩生烃早期形成的CO2可能与储层致密化有一定关系;②轻烃特征可作为不同煤系烃源岩生气鉴别指标,苏里格气田天然气的主要贡献者是煤。
中图分类号:
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