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名称	Comprehensive Understanding of OM-Hosted Pores in Transitional Shale: A Case Study of Permian Longtan Shale in South China Based on Organic Petrographic Analysis, Gas Adsorption, and X‑ray Diffraction Measurements
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP4366.2024
DOI	10.1021/acs.energyfuels.9b01410
数据共享方式	开放下载
摘要	Marine-continental transitional (hereinafter referred to as transitional) Permian shales are the important targets for shale gas in China. However, the nature and formation of organic matter (OM)-hosted pores in this shale facies have not yet been studied in detail from the perspectives of organic petrology and geochemistry. In this paper, we selected typical transitional shale samples from the Permian Longtan Formation in the northwestern Guizhou province to investigate the development of OM-hosted pores mainly through organic petrographic analysis, gas adsorption, and X-ray diffraction (XRD) measurements. Petrographic observations under an optical microscope and a scanning electron microscope (SEM) reveal that the OM in the Longtan shale is composed predominantly of type III kerogens (vitrinite and inertinite), with minor amounts of amorphous solid bitumen. SEM imaging reveals that secondary OM pores (as a result of devolatilization of gaseous hydrocarbons) were very rare in Longtan shale, being only occasionally observed in individual type III kerogens with a bubble-like morphology. This phenomenon is most likely attributed to the chemical-inert body of type III kerogens that cannot depolymerize during thermal degradation. On the other hand, the high methane adsorption values and their strong linear correlation with total organic carbon contents in the Longtan shale indicate that the type III kerogens contain numerous SEM-invisible micropores (<2 nm). By virtue of the combined N2 and CO2 adsorption on the type III kerogens separated from the bulk Longtan shale, we demonstrated the existence of SEM-invisible OM micropores (distributed at 0.34−0.36 nm) and quantified their contribution to the surface area and pore volume of OM as 87 and 13%, respectively. XRD further correlated these micropores to the spacing between the aromatic rings of type III kerogens. As such, the interlayer pores distributed among the aromatic rings are responsible for the sorptive capacity of type III kerogens and the bulk Longtan shale. Overall, the revelation of OM-hosted pores in the transitional shales provides a further understanding of shale gas generation and its occurrence in China.
学科分类	170.50
关键词	X‑rayDiffraction Measurements
作者	Yang Chao
数据量	11.3 MiB
论文类型：	journal
论文网址：	https://doi.org/10.1021/acs.energyfuels.9b01410
期刊名称：	Energy & Fuels
出版时间：	2019-09-19

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数据引用

Yang Chao. Comprehensive Understanding of OM-Hosted Pores in Transitional Shale: A Case Study of Permian Longtan Shale in South China Based on Organic Petrographic Analysis, Gas Adsorption, and X‑ray Diffraction Measurements. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP4366.2024.

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本作品采用知识共享署名 4.0 国际许可协议进行许可。

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项目信息详情

项目名称：深层油气形成与分布预测
项目编号：XDA14010000
项目类别：中国科学院战略性先导科技专项（A类）