南京大学学报(自然科学版) ›› 2020, Vol. 56 ›› Issue (3): 382392.doi: 10.13232/j.cnki.jnju.2020.03.007
戴海亮1,2,沈斌2,李开开1,3(),张小涛2,徐学敏2,许智超2,周晶晶1,2
Hailiang Dai1,2,Bin Shen2,Kaikai Li1,3(),Xiaotao Zhang2,Xuemin Xu2,Zhichao Xu2,Jingjing Zhou1,2
摘要:
选取川北大隆组低熟富有机质页岩样品作为实验对象,综合考虑了地质约束条件(静岩压力、流体压力和地层水等因素)对生烃作用的影响,从低熟到过成熟进行了全系列的热模拟,并对各温度点的热产物进行气体组分及同位素分析.结果表明:热模拟实验产生的烃类气体产率随温度升高而增大,在500 ℃达到峰值,随后明显下降并趋于平稳.烃类气体产率的降低与静岩压力、流体压力以及孔隙发育有着密切关系.压力的不断增大抑制了页岩中有机质的分解,并导致孔隙度降低和孔径减小,排烃不畅,影响了生烃产率.滞留于样品中的重烃组分发生热裂解,最终形成了以高CH4含量特征的原油裂解气,并呈现鲜明的ln(C2/C3)随温度变化特征和碳同位素部分倒转现象.研究为大隆组深层页岩气的有效开发提供前期基础性实验数据和生烃、演化特征方面的成果支持.
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