岩性油气藏 ›› 2025, Vol. 37 ›› Issue (5): 3448.doi: 10.12108/yxyqc.20250504
• 地质勘探 • 上一篇
陆江1,2,3,4, 王健1,2,3, 吴楠1,2,3, 李程善5, 冯子飞6
LU Jiang1,2,3,4, WANG Jian1,2,3, WU Nan1,2,3, LI Chengshan5, FENG Zifei6
摘要: 通过测井数据分析、矿物组分测试、扫描电镜分析、薄片观察、孔渗分析、氮气吸附测试和甲烷吸附测试等,对鄂尔多斯盆地西缘奥陶系乌拉力克组页岩储层开展了岩石学特征、物性及孔隙结构特征、生气潜力及含气性等研究。研究结果表明:①鄂尔多斯盆地西缘奥陶系乌拉力克组岩性以深灰—灰黑色泥页岩为主,分布稳定、厚度约78.9 m,矿物成分以石英为主,脆性矿物质量分数为70.98%~90.32%,脆性指数为50.03%~71.16%。②研究区页岩储层孔隙度普遍小于0.1%,渗透率普遍小于0.01 mD,孔隙类型主要为裂缝、纳米—微米级微孔和粒间溶孔,微观孔隙体积为0.016 27~0.033 73 cm3/g,以微孔和中孔为主。③研究区乌拉力克组页岩有机质类型主要为Ⅰ,Ⅱ1型,TOC最高为1.54%,有机质处于高成熟—过成熟阶段,在30℃时的甲烷最大吸附质量体积为0.99 m3/t,测井解释页岩气的质量体积最高为3.4 m3/t,与国内外典型优质页岩储层相比,其有机质丰度偏低,脆性矿物含量更高,含气量处于中等水平,具有较大的页岩气勘探潜力。
中图分类号:
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