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Temperature-Driven Hydrocarbon Generation-Expulsion and Structural Transformation of Organic-Rich Shale Assessed by in situ Heating SEM

文献类型：期刊论文

作者Yuan, Yuan1,2; Yang, Jijin1,2,3
刊名FRONTIERS IN EARTH SCIENCE
出版日期2021-12-03
卷号9页码:14
关键词immature shale in situ heating scanning electron microscopy hydrocarbon generation and expulsion microfracture formation xiamaling formation
DOI10.3389/feart.2021.797760
英文摘要Mud shale can serve as source or cap rock but also as a reservoir rock, and so the development of pores or cracks in shale has become of great interest in recent years. However, prior work using non-identical samples, varying fields of view and non-continuous heating processes has produced varying data. The unique hydrocarbon generation and expulsion characteristics of shale as a source rock and the relationship with the evolution of pores or cracks in the reservoir are thus not well understood. The present work attempted to monitor detailed structural changes during the continuous heating of shale and to establish possible relationships with hydrocarbon generation and expulsion by heating immature shale samples while performing in situ scanning electron microscopy (SEM) imaging and monitoring the chamber vacuum. Samples were heated at 20 degrees C/min from ambient to 700 degrees C with 30 min holds at 100 degrees C intervals during which SEM images were acquired. The SEM chamber vacuum was found to change during sample heating as a consequence of hydrocarbon generation and expulsion. Two episodic hydrocarbon expulsion stages were observed, at 300 and 500 degrees C. As the temperature was increased from ambient to 700 degrees C, samples exhibited consecutive shrinkage, expansion and shrinkage, and the amount of structural change in the vertical bedding direction was greater than that in the bedding direction. At the same time, the opening, closing and subsequent reopening of microcracks was observed. Hydrocarbon generation and expulsion led to the expansion of existing fractures and the opening of new cracks to produce an effective fracture network allowing fluid migration. The combination of high-resolution SEM and a high-temperature heating stage allowed correlation between the evolution of pores or cracks and hydrocarbon generation and expulsion to be examined.
WOS关键词PORE STRUCTURE ; OIL-SHALE ; NUMERICAL-SIMULATION ; HYDRAULIC FRACTURES ; NUCLEAR-WASTE ; SOLID BITUMEN ; GAS ; EVOLUTION ; PYROLYSIS ; MARINE
WOS研究方向Geology
语种英语
WOS记录号WOS:000760984800001
出版者FRONTIERS MEDIA SA
源URL[http://ir.iggcas.ac.cn/handle/132A11/104923]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Yang, Jijin
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Yuan, Yuan,Yang, Jijin. Temperature-Driven Hydrocarbon Generation-Expulsion and Structural Transformation of Organic-Rich Shale Assessed by in situ Heating SEM[J]. FRONTIERS IN EARTH SCIENCE,2021,9:14.
APA Yuan, Yuan,&Yang, Jijin.(2021).Temperature-Driven Hydrocarbon Generation-Expulsion and Structural Transformation of Organic-Rich Shale Assessed by in situ Heating SEM.FRONTIERS IN EARTH SCIENCE,9,14.
MLA Yuan, Yuan,et al."Temperature-Driven Hydrocarbon Generation-Expulsion and Structural Transformation of Organic-Rich Shale Assessed by in situ Heating SEM".FRONTIERS IN EARTH SCIENCE 9(2021):14.

入库方式： OAI收割

来源：地质与地球物理研究所

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