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Investigation of formation and evolution of organic matter pores in marine shale by helium ion microscope: An example from the lower silurian Longmaxi Shale, South China
Marine and Petroleum Geology ( IF 4.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.marpetgeo.2020.104550
Cheng Huang , Yiwen Ju , Hongjian Zhu , Gary G. Lash , Yu Qi , Kun Yu , Hongye Feng , Liting Ju , Peng Qiao

Abstract Using a helium ion microscope (HIM), we carefully observed and analyzed organic matter (OM) pores in several Longmaxi shale samples collected from the Upper Yangtze Platform, South China. The results indicate that the formation process of OM pore essentially involves gradual expansion and connection of defects/space within OM. This process, which is divided into the four stages of formation, expansion, connection, and consolidation, can involve pore scales ranging from a few nanometers to over a micrometer under HIM. More specifically, spotted spherical pores first form within OM, then expand until they connect to adjacent pores. Within large areas of such connectivity, “pit” structures eventually form, preliminarily defined as OM pores that are significantly larger than surrounding pores, essentially being greater than 100 nm in size. As the final stage of OM pore evolution, the shape and size of “pit” structures can be limited by the framework of mineral particles around or within the OM. Additionally, we found that surrounding pores are smaller when “pit” structures develop, perhaps because removal of side chains of OM tends to occur on the inner surface of the formed pores, leading them to rapidly expand, or because OM particles have differing compositions or structures, some of which may be unfavorable to pore development.

中文翻译:

海相页岩有机质孔隙形成演化的氦离子显微镜研究——以华南下志留统龙马溪页岩为例

摘要 我们利用氦离子显微镜(HIM)对华南上扬子地台多份龙马溪页岩样品中的有机质(OM)孔隙进行了仔细观察和分析。结果表明,OM 孔隙的形成过程主要涉及 OM 内部缺陷/空间的逐渐扩展和连接。这个过程分为形成、膨胀、连接和固结四个阶段,在 HIM 下可以涉及从几纳米到超过一微米的孔隙尺度。更具体地说,点状球形孔首先在 OM 内形成,然后膨胀直到它们连接到相邻的孔。在这种连通性的大面积内,最终形成“坑”结构,初步定义为明显大于周围孔的 OM 孔,尺寸基本上大于 100 nm。作为 OM 孔隙演化的最后阶段,“坑”结构的形状和大小可能受到 OM 周围或内部矿物颗粒框架的限制。此外,我们发现当“坑”结构发展时,周围的孔隙更小,这可能是因为形成的孔隙内表面往往会发生 OM 侧链的去除,导致它们迅速膨胀,或者因为 OM 颗粒具有不同的组成或结构,其中一些可能不利于孔隙发育。
更新日期:2020-10-01
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