How grain size influences hydrocarbon generation and expulsion of shale based on Rock-Eval pyrolysis and kinetics?
文献类型：期刊论文
| 作者 | Sun, Yu1,2,4; Wang, Yunpeng1,2,4; Liao, Lingling3; Shi, Shuyong1,2,4; Liu, Jinzhong1,2 |
| 刊名 | MARINE AND PETROLEUM GEOLOGY
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 155页码:11 |
| 关键词 | Grain-based pyrolysis Grain size Hydrocarbon generation Hydrocarbon expulsion Hydrocarbon retention Shale |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2023.106369 |
| 英文摘要 | The differences between the Rock-Eval pyrolysis results of powder and grain samples have attracted wide attentions. Grain samples show lower hydrocarbon yield and different composition of the products. However, the effect of grain size on hydrocarbon generation and expulsion has not yet been quantitatively evaluated. In this study, we prepared each grain into a regular column with precise geometric parameters such as diameter, height, surface area, and volume, which is defined as an independent unit of hydrocarbon generation and expulsion. For comparison, a powder sample corresponding to each grain sample is collected simultaneously during the preparation process. The grain samples are used to simulate the mass of hydrocarbons expelled, while the powder samples are used to simulate the total mass of hydrocarbon generated. Our results show significant differences between the grain samples and the powder samples. All powder samples have a higher expulsion of free hydrocarbons (S1) than grain samples, and almost all grain samples have a higher expulsion of pyrolysis hydrocarbons (S2) than powder samples when the diameter of the grains is smaller than 3 mm. Temperature controls hydrocarbon generation, but grain size retards hydrocarbon expulsion. The influences of the "carry-over" phenomenon, oil adsorption and nanopore confinement are enhanced by grain size, which retards and inhibits hydrocarbon expulsion. Some free hydrocarbons (S1) cannot be expelled from the grain samples at 300 degrees C. Parts of the retained free hydrocarbons (S1) further cracked into small molecules, which can be expelled and detected as pyrolysis hydrocarbons (S2) at 300-650 degrees C. Four new parameters were proposed to quantify these influences, namely the S1retained, the S2extra expulsion, the HI difference parameter, and the TOC difference parameter. Diameter is more closely related to hydrocarbon expulsion rather than height. For grain samples, HI increases and TOC decreases with increasing diameter. Activation energies for hydrocarbon generation ranges from 43 to 67 kcal/mol for powder samples, while activation energies for grain samples are almost concentrated in 54-55 kcal/mol, indicating a high expulsion threshold for grain samples. As the grain diameter increases from 1.74 to 5.24 mm, the transformation ratio decreases and the generation rate increases, indicating that the grain size delays the expulsion of hydrocarbon. This laboratory simulation provides some new results to better understand the hydrocarbon generation and expulsion of shale rock under natural conditions. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001033653300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74487]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Wang, Yunpeng |
| 作者单位 | 1.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 3.Guangxi Normal Univ, Coll Environm & Resources, Guilin 541006, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Yu,Wang, Yunpeng,Liao, Lingling,et al. How grain size influences hydrocarbon generation and expulsion of shale based on Rock-Eval pyrolysis and kinetics?[J]. MARINE AND PETROLEUM GEOLOGY,2023,155:11. |
| APA | Sun, Yu,Wang, Yunpeng,Liao, Lingling,Shi, Shuyong,&Liu, Jinzhong.(2023).How grain size influences hydrocarbon generation and expulsion of shale based on Rock-Eval pyrolysis and kinetics?.MARINE AND PETROLEUM GEOLOGY,155,11. |
| MLA | Sun, Yu,et al."How grain size influences hydrocarbon generation and expulsion of shale based on Rock-Eval pyrolysis and kinetics?".MARINE AND PETROLEUM GEOLOGY 155(2023):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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