陆相盆地不同岩性页岩含油性及可动性比较——以渤海湾盆地东营凹陷古近系沙四上亚段为例

Comparison of oil-bearing properties and oil mobility of shale with different lithologies in continental basins: a case study of the upper fourth member of Paleogene Shahejie Formation in Dongying Sag, Bohai Bay Basin

李政

LI Zheng

中国石化 胜利油田分公司 勘探开发研究院, 山东 东营 257015 国家能源页岩油研发中心, 山东 东营 257015

Exploration and Development Research Institute of SINOPEC Shengli Oilfield Branch Company, Dongying, Shandong 257015, China State Energy Center for Shale Oil Research and Development, Dongying, Shandong 257015, China

根据矿物组成特征，将渤海湾盆地东营凹陷古近系沙河街组四段上亚段页岩划分为2类岩性：灰质泥岩和泥质灰岩。利用X衍射分析、镜下观察、地化分析、孔隙度测试及压汞分析等技术手段，探讨了该区不同岩性页岩在有机质丰度、含油性、储集性特征和页岩油可动条件方面的差异。灰质泥岩比泥质灰岩具有相对更高的有机质丰度和更好的含油性；灰质泥岩具有相对较高的孔隙度，但孔喉一般偏小，而泥质灰岩孔隙度相对较低，但大孔隙喉道更为发育。从含油饱和度指数、矿物对原油的吸附能力、黏土矿物的转化程度方面比较灰质泥岩和泥质灰岩中页岩油的可动性，认为泥质灰岩中的页岩油比灰质泥岩中的页岩油具有更好的可动性条件。

The shale in the upper part of the 4th member of Paleogene Shahejie Formation in the Dongying Sag of Bohai Bay Basin can be divided into two lithology types: calcareous mudstone and argillaceous limestone. The differences of organic matter abundance, oil-bearing properties, reservoir properties and movable shale oil in the different lithologies were investigated using X-ray diffraction, microscopic observation, geochemical analysis, porosity tests and mercury injection. The calcareous mudstone has relatively higher organic matter abundance and better oil-bearing properties than the calcareous mudstone. The calcareous mudstone has relatively higher porosity, but the pore throats are generally smaller, while the argillaceous limestone porosity is relatively lower with more large pore throats. The shale oil mobility in the calcareous mudstone and argillaceous limestone was compared using the oil saturation index, mineral adsorption capacity for crude oil and clay mineral transformation degree. The shale oil in the argillaceous limestone has better mobility than the shale oil in the calcareous mudstone.

国家科技重大专项 2017ZX05049-004;国家科技重大专项 2016ZX05006-001;中国石化科技攻关课题 P19017-6;胜利油田分公司科技项目 YKK1919

https://doi.org/10.11781/sysydz202004545