国家冰川冻土沙漠科学数据中心

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名称	Formation and evolution of nanopores in shales and its impact on retained oil during oil generation and expulsion based on pyrolysis experiments （生排油过程中页岩纳米孔隙的形成和演化及其对残留油的影响：基于热解实验）
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP5596.2024
DOI	10.1016/j.petrol.2019.01.071
数据共享方式	开放下载
摘要	There have been few systematic studies on the relationship between shale nano-pore formation and evolution and its oil generation and expulsion since geological samples are confined by both maturities and compositions. A low maturity shale sample with type II kerogen was used for artificial pyrolysis experiments (spanning a maturity range of 0.72%–1.46% Ro) to simulate its oil generation and expulsion, the nano-pore structure evolution and its impact on the occurrence of retained oil of the shale with increasing maturity were investigated. The results show that the pore structure is controlled by maturity, with a close relationship with oil and gas generation and expulsion. In the low-middle maturity stage (from 0.72% to 0.83% Ro), the organic matter nanopores are not developed, and the pore structure parameters (denoted by the BET specific surface area and pore volume of the extracted sample) increase slightly with increasing Ro, and the retained oil occurs mainly in macropores and mesopores with a size > 10 nm. In the high maturity stage (from 0.83% to 1.05% Ro), the pore structure parameters increase obviously owing to the formation of organic matter nano-pores resulted from strong oil generation and expulsion, and the retained oil can also occur and enrich in mesopores with size< 5 nm as well as micropores. As matured to the early stage of wet gas (from 1.05% to 1.26% Ro), the retained oil is cracked into light oil and wet gas, associating with an enhanced oil expulsion efficiency, and the pore structure parameters increase slightly, which leads to a significant decrease of the retained oil occurring in macropores and mesopores with size > 30 nm. With further increasing Ro from 1.26% to 1.46%, solid bitumen derived from the cracking of the retained oil blocks a portion of the pores, leading to a decrease of pore structure parameters, and the retained oil occurring in different size pores decreases obviously due to its further cracking. These results provide some new information for understanding the influence of maturity on the occurrence and enrichment of shale oil under geological conditions and could give a guide to the evaluation and exploration of shale oil
学科分类	170.50
关键词	ShaleOil generation and expulsionPyrolysis experimentsMaturityPore structureRetained oil
作者	Sun Jian
数据量	3.5 MiB
论文类型：	journal
论文网址：	https://doi.org/10.1016/j.petrol.2019.01.071
期刊名称：	Journal of Petroleum Science and Engineering
出版时间：	2019-05-01

引用和标注

数据引用

Sun Jian. Formation and evolution of nanopores in shales and its impact on retained oil during oil generation and expulsion based on pyrolysis experiments （生排油过程中页岩纳米孔隙的形成和演化及其对残留油的影响：基于热解实验）. 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.PP5596.2024.

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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）