激光扫描共聚焦显微分析技术表征页岩亚微米级孔隙中的含油性——以准噶尔盆地芦草沟组页岩为例

Characterization of oil-bearing properties in sub-micron shale pores by laser scanning confocal microscopy technology: a case study of shale in Lucaogou Formation, Junggar Basin

鲁锋 李照阳 杨召 张刘平 刘金 李璐璐 刘向军

LU Feng LI Zhaoyang YANG Zhao ZHANG Liuping LIU Jin LI Lulu LIU Xiangjun

中国石油 新疆油田分公司 实验检测研究院, 新疆 克拉玛依 834000 新疆页岩油勘探开发重点实验室, 新疆 克拉玛依 834000 防灾科技学院 地球科学学院, 河北 三河 065201 中国科学院 地质与地球物理研究所 油气资源研究重点实验室, 北京 100029

Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China Xinjiang Key Laboratory of Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China School of Earth Sciences, Institute of Disaster Prevention, Sanhe, Hebei 065201, China Key Laboratory of Petroleum Resource Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

亚微米级孔隙及其含油性是页岩油勘探开发所需的重要信息。为应用激光扫描共聚焦显微镜有效观测亚微米级孔隙的含油性，修改了激光扫描共聚焦显微镜主分光器和检测器的前置滤光片配置，使之能较好地进行反射光和荧光联合扫描，消除矿物所发荧光的干扰，实现了亚微米级孔隙及其含油性的精确观测。该方法在准噶尔盆地吉木萨尔凹陷芦草沟组页岩油研究中进行了应用，发现了大量的亚微米级含油孔隙；页岩油多呈不规则形状、斑块状和星点状。这套页岩的有机质成熟度Ro为0.6%~1.1%，平均约为0.9%，但轻、重质组分的分布具有显著的非均一性，不完全受成熟度控制。在有些部位，轻质组分含量及其与重质组分的比值均较高，但在成熟度相近甚至稍高的邻近部位，却存在以重质组分为主的情况。页岩层系内部的油气运移也是一个重要的控制因素。页岩中的轻质和重质组分的观测与分布规律研究，对于页岩油勘探开发十分重要，激光扫描共聚焦显微新技术可成为重要的观测手段。

Sub-micron pores and their oil-bearing properties are important information for the exploration and development of shale oil. For effective observation on oil-bearing properties of sub-micron pores by laser scanning confocal microscopy, prefilter allocation of main light splitter and detector in laser scanning confocal microscopy was modified in order to conduct combined scanning of reflected light and fluorescent light well, eliminate fluorescence interference from the minerals, and then accomplish accurate observation on sub-micron pores and their oil-bearing properties. This method was applied in the study on Lucaogou Formation shale oil in the Jimsar Sag, Junggar Basin. Most of shale oil occurred in irregular, patchy and star forms. The organic matter maturity of this shale (Ro) was in the range of 0.6%-1.1% and roughly 0.9% in average. However, the distribution of light and heavy components was significantly heterogeneous and controlled by the maturity incompletely. In some positions, both light component content and its ratio with heavy component content were high, while there were mainly heavy components in the places with approximate maturity or in adjacent high places. Hydrocarbon migration in shale sequences is also a crucial controlling factor. The observation on light and heavy components in the shale and the study on their distribution regularities are critical for the exploration and development of shale oil. New technology of laser scanning confocal microscopy could act as an important observation measure.

国家科技重大专项 210017553003;中国科学院战略性先导科技专项 XDB10020203;中央高校基本科研业务费专项 ZY20200208

https://doi.org/10.11781/sysydz202301193