Three-dimension Characterization of Organic Matter Pore Structures of Shale Using Focused Ion Beam-Scanning Electron Microscope
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摘要: 页岩中纳米级有机孔的大小直接影响页岩气含气量，其连通性亦对气体运移和开采至关重要。本文选择漆辽地区龙马溪组富有机质页岩，利用聚焦离子束-扫描电镜（FIB-SEM）在纳米尺度上（10 nm）进行有机孔结构的三维重构。研究结果表明：① FIB-SEM方法适用于微米级页岩的纳米（>3 nm）孔隙结构特征研究。②蜂窝状有机孔发育均匀，孔径集中于10~200 nm，连通性较差；界面有机孔孔径集中于200~300 nm，局部连通性较好。③页岩总孔隙度与有机质含量成正比。研究认为，对于以有机孔为重要储集空间的页岩，有机质分布越集中，连续性越好，研究孔隙度的表征单元体尺度越小。
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关键词:
- 聚焦离子束-扫描电镜 /
- 三维空间结构 /
- 有机孔 /
- 纳米孔隙结构 /
- 龙马溪组页岩
Abstract: The size of organic matter (OM) pore in shale directly affects shale gas content, and its connectivity is of great significance for gas migration and exploitation. Three-dimension reconstructions down to nanometer scale (about 10 nm) are performed on OM pores in samples from the Lower Silurian Longmaxi Formation in Qiliao area using Focused Ion Beam-Scanning Electron Microscope (FIB-SEM). The results indicate that FIB-SEM technique is an effective method for three-dimension characterization of nano-scale (>3 nm) pore structures of micro-scale shale samples. Honeycomb OM pores distribute uniformly with poor connectivity, and their diameters are dominated by 10-200 nm. Micro-crack like OM pores at the interface exhibit good connectivity on the local area, with diameters concentrated at 200-300 nm. Bulk porosity of shale is positively correlated to OM content. For shale with OM pores as host, the concentrated distribution of the organic matter and the good continuity will result in a small size of unit cell for characterization of porosity. -
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