岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 7283.doi: 10.12108/yxyqc.20240307
段逸飞1,2, 赵卫卫1,2, 杨天祥3, 李富康4, 李慧1,2, 王嘉楠1,2, 刘钰晨1,2
DUAN Yifei1,2, ZHAO Weiwei1,2, YANG Tianxiang3, LI Fukang4, LI Hui1,2, WANG Jianan1,2, LIU Yuchen1,2
摘要: 鄂尔多斯盆地延安地区二叠系山西组页岩气勘探潜力较大。通过分析钻井、录井以及测井资料,结合泥页岩样品的分析化验资料,深入分析了延安地区二叠系山西组页岩气源储特征及成藏过程,并探讨页岩气聚集机理。研究结果表明:①鄂尔多斯盆地延安地区二叠系山西组大面积分布的泥页岩有机碳(TOC)含量较高,平均质量分数为 2.12%,干酪根类型主要为Ⅲ型,Ro为2.0%~3.7%,处于高成熟—过成熟阶段,为优质烃源岩。②研究区山西组泥页岩矿物组成整体上具有富黏土特征,黏土矿物平均质量分数为 56.7%,有利于吸附气的赋存;主要发育无机矿物孔、有机孔和微裂缝 3 种储集空间类型;岩石含气性受不同岩性组合的影响而差异较大,山 2 段相较于山 1段具有较高的含气量(平均质量体积为1.38 m3/t)。按照源储配置关系,可划分为厚层泥页岩夹薄砂层、泥页岩与粉砂岩和细砂岩互层、泥页岩与煤层混层 3 种类型,不同的源储配置具有不同的含气特征。③研究区页岩气主要以吸附态、游离态赋存,在成藏过程处于动态平衡的状态,随着地层条件的变化而不断转化。其聚集过程可分为 3 个阶段:早侏罗世,有机质开始生成气态烃,页岩气开始吸附聚集;中—晚侏罗世,气态烃大量生成膨胀造隙,气态烃排出,裂缝关闭,循环运移聚集;早白垩世,有机质达到高—过成熟阶段,进入最后一个生排烃时期,直至地层抬升,生烃终止。泥页岩良好的封盖作用为页岩气藏的形成提供了坚实的保障。
中图分类号:
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