油气地质与采收率2025，Vol.32Issue(3)：1-13,13.DOI:10.13673/j.pgre.202309015
川东地区侏罗系凉高山组页岩油优势岩相及其油气富集主控因素
Dominant lithofacies and main controlling factors of shale oil and gas enrichment in Jurassic Lianggaoshan Formation in eastern Sichuan region
摘要
Abstract
The geological reserves of shale oil from the Jurassic Lianggaoshan Formation in the eastern Sichuan region are large,but challenges of the high inhomogeneity and the unclear identification of sweet spots,etc.,seriously limit the effective exploration and development of oil and gas.Based on data from core drilling,X-ray diffraction(XRD),scanning electron microscope(SEM),and two-dimensional nuclear magnetic resonance(2D NMR),the shale oil lithofacies in the Jurassic Lianggaoshan Formation in the east-ern Sichuan region were finely divided,and the storage properties,oil content,and mobility characteristics of shale oil reservoirs of different lithofacies were in-depth analyzed.Then,the dominant lithofacies and the main controlling factors of oil and gas enrichment were clarified.The results show that shale oil reservoirs of the Jurassic Lianggaoshan Formation in the eastern Sichuan region develop five types of lithofacies:massive sandstone,siltstone,interlayered sand-mudstone,massive shale,and laminated shale.Among them,massive sandstone,siltstone,and interlayered sand-mudstone are ineffective reservoirs,which mainly play the role of cap rock,while massive shale and laminated shale are the dominant lithofacies in the eastern Sichuan region,belonging to typical self-generation,self-storage and micro-migration shale oil reservoirs,with high total organic carbon(TOC),high pyrolytic hydrocarbon content,high porosity,high oil saturation,and high mobile oil saturation.The strong enrichment and high production of shale oil and gas from massive shale and laminated shale are mainly controlled by the following factors:① The organic-rich shale is the material basis for shale oil and gas enrichment and storage in the deep-water environment of the foreland depression.② The high vitrinite re-flectance and hydrophilicity are the key factors of shale oil and gas migration and production.③ The bedding fractures controlled by the high stratigraphic pressure are an essential guarantee for the stable and high production of shale oil and gas.The massive shale and laminated shale are the key shale oil exploration targets of the Jurassic Lianggaoshan Formation in the eastern Sichuan region.关键词
凉高山组/页岩油/地质特征/富集高产/川东地区Key words
Lianggaoshan Formation/shale oil/geological characteristic/enrichment and high production/eastern Sichuan region分类
石油、天然气工程引用本文复制引用
谢冰,张哲豪,白利,方朝强,何绪全,罗燕颖,苗秀英,贺国芬..川东地区侏罗系凉高山组页岩油优势岩相及其油气富集主控因素[J].油气地质与采收率,2025,32(3):1-13,13.基金项目
中国石油天然气集团有限公司科技项目"陆相页岩油规模增储上产与勘探开发关键技术研究"课题二"陆相页岩油地球物理建模关键技术研究"(2023ZZ15YJ02),中国石油集团测井有限公司科学研究与技术开发项目"测井油藏与地质研究"课题一"岩石物理实验分析技术研究与应用"(CNLC2022-8BO1). （2023ZZ15YJ02）
