Characterization of free and bound bitumen fractions in a thermal maturation shale sequence. Part 2: Structural evolution of kerogen and bitumen during shale oil generation, expulsion and retention
文献类型：期刊论文
| 作者 | Pan, Yinhua3,4; Li, Maowen3; Sun, Yongge2; Li, Zhiming3; Liao, Lingling4; Liao, Yuhong1,5 |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2023-08-01 |
| 卷号 | 182页码:13 |
| ISSN号 | 0146-6380 |
| DOI | 10.1016/j.orggeochem.2023.104640 |
| 英文摘要 | Knowledge of the formation and enrichment mechanisms of shale oil is essential to understanding its mobility and hence a critical aspect for evaluating shale oil exploration and production. Semi-open hydrous pyrolysis experiments were performed on an organic-rich shale to simulate the petroleum generation and expulsion processes of Type II kerogen. The residual rocks matured to different levels (Easy%Ro = 0.50-1.37) were thereafter treated with stepwise extraction to obtain free and bound bitumen fractions. This study focuses on the structural characteristics of kerogen, bitumen fractions, and expelled oil during shale maturation using Fourier transform infrared (FTIR) spectroscopy and quantitative flash pyrolysis-gas chromatography (Py-GC). The re-sults reveal that the composition of expelled oils changes with increasing maturity, whereas an opposite trend in structural composition was observed for kerogen after significant oil expulsion from the shale occurs, beginning at Easy%Ro = 0.79. A notable change is that aliphatic carbon chains of kerogen became shorter and/or more branched while those of expelled oil appeared to be more aliphatic with longer carbon chains at this stage. However, the overall compositional structures of shale bitumen fractions, both in free and bound phases, show only slight changes within the oil window stage. The bound bitumen is generally enriched in oxygenated functional groups as compared to free bitumen, indicating that the bound bitumen is related mainly to the interaction between the mineral surface and the bitumen-kerogen matrix. During maturation, the cracking (including defunctionalization) and condensation of kerogen and bitumen fractions, as well as a compositional fractionation due to oil expulsion, are likely to be the main factors influencing the opposite trend observed in structural compositions between kerogen and expelled oil. These processes may control the quality and content of expelled oil and bitumen in a petroleum system. Nevertheless, kerogen, expelled oil and bitumen show a gradual trend of decarboxylation during shale maturation in general. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001025353200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74466]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Li, Maowen |
| 作者单位 | 1.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Peoples R China 3.Sinopec Petr Explorat & Prod Res Inst, State Key Lab Shale Oil & Gas Accumulat Mech & Eff, 197 Baisha Rd, Beijing 102206, Peoples R China 4.Guangxi Normal Univ, Coll Environm & Resources, 15 Yucai Rd, Guilin 541004, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Pan, Yinhua,Li, Maowen,Sun, Yongge,et al. Characterization of free and bound bitumen fractions in a thermal maturation shale sequence. Part 2: Structural evolution of kerogen and bitumen during shale oil generation, expulsion and retention[J]. ORGANIC GEOCHEMISTRY,2023,182:13. |
| APA | Pan, Yinhua,Li, Maowen,Sun, Yongge,Li, Zhiming,Liao, Lingling,&Liao, Yuhong.(2023).Characterization of free and bound bitumen fractions in a thermal maturation shale sequence. Part 2: Structural evolution of kerogen and bitumen during shale oil generation, expulsion and retention.ORGANIC GEOCHEMISTRY,182,13. |
| MLA | Pan, Yinhua,et al."Characterization of free and bound bitumen fractions in a thermal maturation shale sequence. Part 2: Structural evolution of kerogen and bitumen during shale oil generation, expulsion and retention".ORGANIC GEOCHEMISTRY 182(2023):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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