岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 3137.doi: 10.3969/j.issn.1673-8926.2015.02.006
徐祖新1,韩淑敏2,王启超3
X U Zuxin1, HAN Shumin2,WANG Qichao3
摘要:
黄铁矿是富有机质沉积的特征矿物,是恢复沉积环境的重要指标,也可以指示页岩的含油气性。基于氩离子抛光-扫描电镜(Ar-SEM)技术获得陡山沱组页岩高分辨率扫描电镜图像,利用 ImageJ 软件统计和分析草莓状黄铁矿粒径大小,探讨黄铁矿含量和吸附气含量之间的关系。 结果表明:①陡山沱组页岩中草莓状黄铁矿粒径小,代表其经历了较长时间的静水缺氧沉积环境,对有机质的富集和保存均有利,为页岩气的形成提供了良好的沉积条件;②陡山沱组页岩储层中黄铁矿含量与吸附气含量呈正相关关系,根据黄铁矿的含量可以预测页岩吸附气;③铁含量越高越有利于有机质富集,而有机质含量的高低直接影响着页岩气的生成能力和赋存能力,根据平面上黄铁矿的富集程度可以预测页岩含气区。
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