天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 10041015.doi: 10.11764/j.issn.1672-1926.2020.05.001
邵德勇1(),张六六2,张亚军2,张瑜1,罗欢2,乔博2,闫建萍2,张同伟1()
De-yong SHAO1(),Liu-liu ZHANG2,Ya-jun ZHANG2,Yu ZHANG1,Huan LUO2,Bo QIAO2,Jian-ping YAN2,Tong-wei ZHANG1()
摘要:
以中上扬子地区下寒武统富有机质页岩为研究对象,分别选取位于寒武系页岩气勘探突破区的湖北宜昌和四川威远2个地区的3个钻井/露头剖面(宜昌WPZK001井剖面、长阳露头剖面和威远W001?4井剖面)和目前勘探失利区的2个典型剖面(贵州开阳剖面和重庆酉阳剖面)共37件样品,开展岩石小柱体的吸水实验,并与四川盆地志留系龙马溪组富有机质页岩进行对比研究。结果表明:寒武系页岩气勘探突破区的下寒武统水井沱组/筇竹寺组富有机质页岩与四川盆地志留系龙马溪组富有机质页岩相似,其饱和吸水量主要受有机碳含量和石英含量的控制,表现出较好的正相关关系,而寒武系页岩气勘探失利区的下寒武统牛蹄塘组富有机质页岩的饱和吸水量则与黏土矿物和碳酸盐矿物含量表现出弱的正相关关系,与有机碳含量和石英含量均无明显相关关系。这不仅指示了研究区下寒武统富有机质页岩发育孔隙网络特征,特别是有机质孔隙的发育,存在显著差异,同时也为从富有机质页岩矿物组成及其成因来源与孔隙发育耦合机制方面来探讨寒武系页岩含气性变化提供了新的研究思路。
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