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Volume 31 Issue 6
Dec 2020
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Bo Liu, Meng Yan, Xianda Sun, Yunfeng Bai, Longhui Bai, Xiaofei Fu. Microscopic and Fractal Characterization of OrganicMatter within Lacustrine Shale Reservoirs in the FirstMember of Cretaceous Qingshankou Formation, Songliao Basin, Northeast China. Journal of Earth Science, 2020, 31(6): 1241-1250. doi: 10.1007/s12583-020-1345-3
Citation: Bo Liu, Meng Yan, Xianda Sun, Yunfeng Bai, Longhui Bai, Xiaofei Fu. Microscopic and Fractal Characterization of OrganicMatter within Lacustrine Shale Reservoirs in the FirstMember of Cretaceous Qingshankou Formation, Songliao Basin, Northeast China. Journal of Earth Science, 2020, 31(6): 1241-1250. doi: 10.1007/s12583-020-1345-3

Microscopic and Fractal Characterization of OrganicMatter within Lacustrine Shale Reservoirs in the FirstMember of Cretaceous Qingshankou Formation, Songliao Basin, Northeast China

doi: 10.1007/s12583-020-1345-3
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  • Corresponding author: Liu Bo, liubo6869@163.com
  • Received Date: 10 Apr 2020
  • Accepted Date: 26 Aug 2020
  • Publish Date: 18 Dec 2020
  • Understanding the occurrences of different fractions of organic matter in shale reservoirs is very important for the evaluation of shale oil. Lacustrine organic-rich shale samples from the first member of the Cretaceous Qingshankou Formation in the Songliao Basin were analyzed with confocal laser scanning microscopy (CLSM) and fluorescence spectral analysis. The results show that the occurrences of different organic components are related to the fabric of samples and vary with depth. The bulk content of light components is significantly higher than heavy components and exhibits a positive relationship with quartz and feldspar contents. Both light and heavy components are distributed parallel with the lamination in microscopic view in laminated samples, and randomly in massive samples. The maximum radius of light components in most of the samples is larger than 20 μm, while it is smaller for heavy components, indicating the micro fractionation from clay/organic lamina to quartz/feldspar lamina. The depth of enrichment of light components corresponds to the oil maturity of organic matter. Both the distribution of light and heavy components fits the same fractal model, with fractal dimensions ranging between 2.2 and 2.5. The CLSM results confirm that it can be a reliable tool for the "sweet spot" exploration.

     

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