天然气地球科学 ›› 2022, Vol. 33 ›› Issue (4): 666676.doi: 10.11764/j.issn.1672-1926.2021.09.012
Guoxin SHAN1(),Peng CHENG2,Xianming XIAO1(),Jian SUN1,Ping GAO1
摘要:
页岩储层的含水特征对页岩气评价与勘探开发具有重要的影响,然而对于高—过成熟煤系页岩的相关研究缺乏。对取自沁水盆地阳泉区块的2块煤系页岩样品进行了平衡水吸附实验,研究了吸附水对页岩孔隙结构参数的影响,探讨了吸附水在页岩纳米孔隙中的赋存与分布。结果表明:页岩样品吸附水对孔隙结构参数有显著的影响, 吸附水含量(饱和度)与部分孔隙结构参数呈现非线性负相关关系。页岩样品中很低的吸附水含量就可大幅度减少其有效孔隙结构参数,尽管如此,即使页岩样品达到很高的吸附水饱和度,仍有部分孔隙空间与表面积可用于气体吸附。吸附水在非微孔中主要呈吸附态,而在微孔中主要呈填充态。研究成果为进一步认识地质条件下高—过成熟度煤系页岩孔隙水的赋存特征,以及客观评价页岩的含气性提供了参考。
中图分类号:
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