氦离子显微镜在页岩有机质孔隙识别中的应用

氦离子显微镜在页岩有机质孔隙识别中的应用

王朋飞^1，2, 田黔宁¹, 张  玮¹, 金  璨³, 刘  国¹, 臧小鹏¹, 张  昆², 李  鑫²

(1.  中国地质调查局地学文献中心，北京 100083；2. 中国石油大学油气资源与探测国家重点实验室，北京 102249；3.中国石油化工股份有限公司上海海洋油气分公司，上海 200120)

摘  要  有机质孔隙已被证明是页岩中最为有效赋存烃类气体的一类孔隙，因此有效识别页岩中的有机质孔隙对评价页岩储层的勘探开发潜力至关重要。而应用传统的扫描电子显微镜（SEM）识别有机质孔隙存在多种弊端。此次研究以涪陵焦石坝地区发育的下志留统龙马溪组页岩为例，应用氦离子显微镜（HIM）的先进技术，观察并识别龙马溪组页岩中的有机质孔隙结构特征。结果表明：HIM针对有机质孔隙的识别精度远大于SEM，其分辨精度达到0.5 nm，具有成像清晰、景深大和灵敏度高的优点，HIM可有效识别直径分布在0～20 nm左右的有机质孔隙。

关键词 HIM；龙马溪组页岩；有机质孔隙；孔隙结构；连通性

中图分类号：TE121.2；TE122；P575.2    文献标识码：A    doi:10.3969/j.issn.1000-6281.2020.03.008

Application of helium ion microscope in recognition of organic matter pore in shale

WANG Peng-fei^1，2, TIAN Qian-ning¹，ZHANG Wei ¹，JIN Can³，LIU Guo ¹，ZANG Xiao-peng¹，

ZHANG Kun²，LI Xin²

(1. Geoscience Documentation Center，CGS, Beijing 100083；2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249；3. Sinopec Shanghai Offshore Petroleum Company, Shanghai 200120, China)

Abstract  Organic matter pores determine the effective occurrence and seepage of shale gas, and the ability to effectively identify organic matter pores in shale is essential for evaluating the exploration and development potential of shale gas blocks. The application of traditional scanning electron microscopy (SEM) technology to identify organic pores has many drawbacks. This study takes the Lower Silurian Longmaxi Formation shale developed in the area of ​​Fuling Jiaoshiba as an example, focusing on the application of helium ion microscope (HIM) technology to identify organic matter pores and comparing with the effect of SEM. The results show that the recognition accuracy of HIM for organic matter pores is much larger than that of SEM, and its resolution is 0.5nm. It has the advantages of clear imaging, large depth of field and high sensitivity. HIM can effectively identify organic pores with diameters between 0 and 20 nm.

Keywords  HIM；longmaxi formation shale；organic matter pore；pore structure；connectivity

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