Incorporation of wet gases to kerogen in petroleum formation and evolution
文献类型：期刊论文
| 作者 | Yu, Shuang6 ; Li, Erting1; Xu, Hao3; Huang, Wenkui4; Zeng, Lifei5; Jiang, Lanlan2; Pan, Changchun6
|
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 180页码:15 |
| 关键词 | Dryness ratio Wet gas incorporation to kerogen Recycling reaction mechanism |
| ISSN号 | 0146-6380 |
| DOI | 10.1016/j.orggeochem.2023.104605 |
| 英文摘要 | The formation mechanism for thermogenic gas remains unresolved. Disputes are focused on: (1) stability barrier for decomposition of oil to gas and wet gas to methane, and (2) inconsistence in dryness ratio (C1/sigma C1-5) between gases produced in pyrolysis experiments and in natural reservoirs. Here, we demonstrate the variation trend of dryness ratio (C1/sigma C1-5) with temperatures and thermal stress levels, and the correlation of dryness ratios with the yields of liquid components (sigma C8+) in confined pyrolysis experiments (gold capsules) of twenty coals. At both heating rates of 2 and 20 degrees C/h, dryness ratios of gaseous hydrocarbons at first decrease, and then increase with increasing temperatures and thermal stress levels. Dryness ratios of produced gases can be very high in the range of 66.3-95.7 wt% at initial temperature about 334 degrees C and heating rate of 20 degrees C/h, corresponding to EASY%Ro 0.56. We suggest that these gases are not the original products released from kerogen, but have been altered via wet gas incorporation to kerogen. Larger oil molecules (C8+) are more competitive in incorporating to kerogen compared with wet gases, and therefore, prohibit wet gas incorporation, leading to the observed trend of gas dryness ratios with increasing temperature and maturity and the negative correlation between dryness ratios and the yields of liquid components (sigma C8+). The conflicting results between the yields and carbon isotopes of wet gases produced in the isothermal confined pyrolysis experiments for coal plus oil can be well interpreted using the reaction mechanism that wet gases incorporate to kerogen while oil components retard this incorporation. Once free oil and wet gas molecules are reincorporated to kerogen, the bound molecules can easily decompose to smaller molecules due to substantial reduction of activation energy for carbon-carbon bond rupture. Petroleum formation from kerogen can be a recycling process: kerogen first releases oil compounds, and then free molecules reincorporate to kerogen and further decompose to smaller molecules, and finally to methane. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000983563900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74188]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Pan, Changchun |
| 作者单位 | 1.Xinjiang Oilfield Co, Res Inst Expt & Testing, PetroChina, Karamay 834000, Xinjiang, Peoples R China 2.Anneng Petr Tech Dev & Serv LTD Co, 28 Changhong St, Modern Ind Pk, Binhai New Area, Tianjin 300480, Peoples R China 3.PowerChina Ecoenvironm Grp Co Ltd, Haina Baichuan Bldg, 6, Baoxing Rd, Xinan St, Shenzhen 518101, Peoples R China 4.Qinghai Nationalities Univ, Sch Tourism, Xining 810007, Peoples R China 5.Chongqing Jiaotong Univ, Sch River & Ocean Engn, Chongqing 400074, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Shuang,Li, Erting,Xu, Hao,et al. Incorporation of wet gases to kerogen in petroleum formation and evolution[J]. ORGANIC GEOCHEMISTRY,2023,180:15. |
| APA | Yu, Shuang.,Li, Erting.,Xu, Hao.,Huang, Wenkui.,Zeng, Lifei.,...&Pan, Changchun.(2023).Incorporation of wet gases to kerogen in petroleum formation and evolution.ORGANIC GEOCHEMISTRY,180,15. |
| MLA | Yu, Shuang,et al."Incorporation of wet gases to kerogen in petroleum formation and evolution".ORGANIC GEOCHEMISTRY 180(2023):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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