Argon broad ion beam tomography in a cryogenic scanning electron microscope: a novel tool for the investigation of representative microstructures in sedimentary rocks containing pore fluid
Argon broad ion beam tomography in a cryogenic scanning electron microscope: a novel tool for the investigation of representative microstructures in sedimentary rocks containing pore fluid
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DOI：
10.1111/jmi.12011
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发表时间：
2013-03-01
影响因子：
2
通讯作者：
Wollenberg, U.
中科院分区：
文献类型：
--
作者：
Desbois, G.;Urai, J. L.;Wollenberg, U.
的贡献描述了一个广泛的离子束（BIB）抛光到扫描电子显微镜（SEM）在低温（cryo）下运行的实施。整个系统（BIB-cryo-SEM）提供了第一代新型多束电子显微镜，该显微镜将宽离子束与常规SEM中的低温设施相结合，以在低温温度下产生大的高质量横截面（高达2 mm 2），并以最先进的SEM分辨率成像。低温方法允许检测自然环境中的流体，并保护样品免受干燥和脱水，这可能会破坏天然微结构。在第三个维度的微观结构的调查是通过连续的横截面，提供宽的离子束断层扫描切片低至350纳米厚。BIB-cryo-SEM的功能通过岩盐（由在150 MPa和4.5 GPa下冷压的岩盐-盐水糊状物合成的合成粗颗粒氯化钠，以及来自伊朗中部库姆库的盐冰川的天然岩盐糜棱岩）的研究来证明。此外，BIB-cryo-SEM的结果，对气页岩和Boom粘土也表明，该仪器适用于大范围的沉积岩。这是第一次，保存的主机和储集岩的孔隙和颗粒组构可以在纳米尺度范围内的代表性的基本区域进行调查。与BIB-SEM方法与聚焦离子束-SEM和X射线断层扫描方法的互补和重叠性能相比，BIB横截面能够以比X射线断层扫描更高的分辨率详细了解孔的形态，并允许产生适合于BIB横截面内特定代表性位点的FIB-SEM研究的大型代表性表面。
The contribution describes the implementation of a broad ion beam (BIB) polisher into a scanning electron microscope (SEM) functioning at cryogenic temperature (cryo). The whole system (BIB-cryo-SEM) provides a first generation of a novel multibeam electron microscope that combines broad ion beam with cryogenic facilities in a conventional SEM to produce large, high-quality cross-sections (up to 2 mm2) at cryogenic temperature to be imaged at the state-of-the-art SEM resolution. Cryogenic method allows detecting fluids in their natural environment and preserves samples against desiccation and dehydration, which may damage natural microstructures. The investigation of microstructures in the third dimension is enabled by serial cross-sectioning, providing broad ion beam tomography with slices down to 350 nm thick. The functionalities of the BIB-cryo-SEM are demonstrated by the investigation of rock salts (synthetic coarse-grained sodium chloride synthesized from halite-brine mush cold pressed at 150 MPa and 4.5 GPa, and natural rock salt mylonite from a salt glacier at Qom Kuh, central Iran). In addition, results from BIB-cryo-SEM on a gas shale and Boom Clay are also presented to show that the instrument is suitable for a large range of sedimentary rocks. For the first time, pore and grain fabrics of preserved host and reservoir rocks can be investigated at nm-scale range over a representative elementary area. In comparison with the complementary and overlapping performances of the BIB-SEM method with focused ion beam-SEM and X-ray tomography methods, the BIB cross-sectioning enables detailed insights about morphologies of pores at greater resolution than X-ray tomography and allows the production of large representative surfaces suitable for FIB-SEM investigations of a specific representative site within the BIB cross-section.