大民屯凹陷油页岩层段储集性能研究

利用岩石薄片、X 射线衍射、氩离子抛光扫描电镜、压汞实验、比表面积测量、地化分析及高温干馏 等方法，分析了大民屯凹陷油页岩层段的岩性特征、矿物组成、储集特征及含油特征等，并初步评价了其 储集性能。研究结果表明：该区油页岩层段为典型的“三明治”结构，上下2 套油页岩之间夹有泥岩、砂 岩、泥灰岩和玄武岩等，油页岩具有泥质结构、纹层构造，层理缝发育；油页岩的石英和碳酸盐含量普遍 较高，易于形成构造裂缝和溶孔；油页岩和泥岩孔径小、相对均质、渗透率低，且油页岩的比表面积、孔径 和总孔隙体积大于泥岩；油页岩层段的砂岩夹层和泥灰岩油气显示普遍，上下2 套油页岩气测异常明 显；油页岩干馏含油率为中等级别，热解生烃潜量高，能够达到卢双舫等关于页岩油的富集资源判别标 准。3 口老井地层测试获得成功和S224 井已经开采大量页岩油的事实，证实大民屯凹陷油页岩层段满 足页岩油对储集性能的要求。

Study on the reservoir properties of the interval of oil shale in Damintun Depression

By using the data of thin section, X-ray diffraction, argon ion polishing scanning electron microscope, mercury injection test, specific surface area measurement, geochemical analysis and oil shale retorting, this paper analyzed the lithology characteristics, mineral components, physical properties and oil potential of the oil shale interval in Damintun Depression, and evaluated the reservoir properties. The results show that the interval of oil shale has the typical ＂sandwich＂ structure. The up and low layers are oil shale, with mudstone, sandstone, marlstone and basalt in the middle. The oil shale has pelitic texture, laminar structure and bedding fracture. The content of quartz and carbonate is generally high in oil shale, so it is easy to form oil shale reservoir space, such as structural fractures and dissolved pores. Oil shale and mudstone are relatively homogeneous and they are characterized by small pores and low permeability. The specific surface area, pore diameter and total pore volume of oil shale are all bigger than that of mudstone. The hydrocarbon show of the interval of oil shale is common, especially in sandstone and marlstone, and the gas logging abnormal of oil shale is obvious. Oil content of oil shale is in intermediate level by retorting. The potential hydrocarbon generation amount of oil shale is high, reaching the shale oil enrichment standard by Lu Shuangfang. The formation testson three old wells are successful and S224 well has mined a lot of shale oil, which proves that the interval of oil shale can meet the shale oil storage requirements in Damintun Depression.