“核磁+”页岩油实验技术体系及应用

"NMR+" shale oil experimental technology system and application

石玉江 张哲豪 赵建斌 罗燕颖 万金彬 贺国芬 张陈珺 胡祖志

SHI Yujiang ZHANG Zhehao ZHAO Jianbin LUO Yanying WAN Jinbin HE Guofen ZHANG Chenjun HU Zuzhi

中国石油 测井有限公司, 西安 710077 中国石油 测井重点实验室, 西安 710077 中国石油 东方地球物理公司, 河北 涿州 072751

China National Logging Corporation, Xi'an, Shaanxi 710077, China Well Logging Key Laboratory, CNPC, Xi'an, Shaanxi 710077, China BGP Inc., CNPC, Zhuozhou, Hebei 072751, China

为准确获取页岩油孔隙度、含油饱和度、可动油饱和度等储层评价关键参数，以岩心核磁共振为基础，结合氦气法、重水抑制法、多温阶加热法联测实验，建立了“核磁+”页岩油实验技术体系，实现一套实验流程、多岩石物理参数的获取。“核磁+氦气”通过测试岩心赋存及逸散流体含量，获取总孔隙度；“核磁+重水抑制”基于重水抑制及毛管渗吸原理，明确二维核磁图谱不同流体分布及含量，获取含油饱和度；“核磁+多温阶加热”基于加热前、后不同状态二维核磁分布，明确重质烃流动起始温度点及油气逸散量，获取可动油饱和度。应用该技术体系，对鄂尔多斯盆地陇东地区X井三叠系延长组长73段(2 285.26 m)新鲜富有机质页岩样品进行测试，明确总孔隙度为5.5%，含油饱和度为53.66%，可动油饱和度为42.68%；同时基于实验结果，计算该段储层核磁测井可动孔隙度T2截止值为4 ms。“核磁+”页岩油实验技术体系的建立和应用，丰富了室内实验室获取岩心孔隙度、饱和度的手段与方法。

To accurately obtain the key reservoir evaluation parameters such as porosity, oil saturation, and movable oil saturation in shale oil, an experimental technology system "NMR+" was established based on core nuclear magnetic resonance (NMR), combined with helium gas method, heavy water inhibition method, and multi-temperature heating method. Through this set of experimental workflow, multiple petrophysical parameters were obtained. Total porosity was obtained via the "NMR + helium" method by measuring the content of retained and escaping fluids in the cores. The "NMR + heavy water inhibition" method determined the distribution and content of different fluids using 2D NMR spectra based on the principles of heavy water inhibition and capillary imbibition, thereby obtaining oil saturation. The "NMR + multi-temperature heating" method determined the initial temperature point at which heavy hydrocarbons began to move and the amount of escaped hydrocarbon, based on the differences in 2D NMR distributions before and after heating, thereby obtaining movable oil saturation. This technical system was applied to fresh organic-rich shale samples from the third submember of the seventh member of the Triassic Yanchang Formation (Chang 73) (2 285.26 m) of well X in the Longdong area, Ordos Basin. A total porosity of 5.5%, oil saturation of 53.66%, and movable oil saturation of 42.68% were determined. At the same time, based on the experimental results, a 4 ms T2 cut-off value for movable porosity was calculated for this reservoir submember using NMR logging. The establishment and application of the "NMR+" experimental technology system for shale oil have enriched the laboratory methods and approaches for obtaining core porosity and saturation.

中国石油天然气集团有限公司科技项目“多物理场高精度油气地球物理探测技术与装备”之课题六 2023ZZ05;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”之课题一 CNLC2022-8BO1

https://doi.org/10.11781/sysydz2025040872