Gas geochemical evidences for biodegradation of shale gases in the Upper Triassic Yanchang Formation, Ordos Basin, China
文献类型：期刊论文
| 作者 | Meng, Qiang1,2; Wang, Xiaofeng1; Wang, Xiangzeng3; Shi, Baoguang1; Luo, Xiaorong1; Zhang, Lixia3; Lei, Yuhong1; Jiang, Chengfu3; Liu, Peng1,2 |
| 刊名 | INTERNATIONAL JOURNAL OF COAL GEOLOGY
 |
| 出版日期 | 2017-06-15 |
| 卷号 | 179页码:139-152 |
| 关键词 | Biodegradation Shale gas Yanchang Formation Methane Ethane |
| ISSN号 | 0166-5162 |
| DOI | 10.1016/j.coal.2017.05.018 |
| 文献子类 | Article |
| 英文摘要 | Fractionation of chemical components and hydrogen/carbon isotopic compositions associated with biodegradation of shale gases were determined from typical shale profiles of the Upper Triassic Yanchang Formation, Ordos Basin, China. The results show that the light hydrocarbons (C-1-C-5) of the shale gases were partially degraded by microorganisms and the degradation degree decreased with depth in the profile of Well YY22. However, the degradation degree of Wells FY2 is basically unchanging at different depths and there is no obvious evidence for biodegradation in Well YY18. Biodegradation of C-1 and C-2 can occur and the degradation of hydrocarbon gas does not occur in any obvious sequence, but instead there are only small differences between the relative degradation rates. The relative degradation rates in descending sequence were C-3 = n-C-4 = n-C-5 > i-C-5 = i-C-4 > C-2 > C-1. With intensification of degradation, delta C-13(1) of shale gas showed no obvious change, whereas a marked alteration took place in delta(HC1)-H-2. The delta C-13 values of C-3 and n-C-4 did not alter significantly during early biodegradation; thus, use of exceptional heavy isotopic compositions of those two components to recognize moderate levels of biodegradation is limited. In contrast, the delta C-13 and delta H-2 values of C-2 became more positive even at a low degree of biodegradation; hence, these are effective parameters for identifying biodegraded gases with a low degree of degradation. No obvious change of isotopic composition was observed for the n-C-5 and i-C-5 during degradation. Due to the low relative degradation rates but high content of C-1 and C-2, biodegradation of C-1 and C-2 will severely destroy and decrease the gas content of shale gas. There is a positive relationship between gas content and total organic carbon (TOC) of shale samples without biodegradation. In contrast, samples that have experienced biodegradation show an obvious decrease in gas content with TOC. |
| WOS关键词 | CARBON ISOTOPIC COMPOSITION ; SULFATE-REDUCING BACTERIA ; COAL-BED METHANE ; ANAEROBIC OXIDATION ; DEEP SUBSURFACE ; NATURAL-GAS ; ORGANIC GEOCHEMISTRY ; PETROLEUM RESERVOIRS ; BIOGENIC METHANE ; MICHIGAN BASIN |
| WOS研究方向 | Energy & Fuels ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000408072500011 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Natural Sciences Foundation of China(41372156) ; "Western Light Project" of the Chinese Academy of Sciences (A New Method for Determining Organic Matter Abundance of Carbonate in Lower Paleozoic) ; Key Laboratory Project of Gansu Province(1309RTSA041) ; Natural Sciences Foundation of China(41372156) ; "Western Light Project" of the Chinese Academy of Sciences (A New Method for Determining Organic Matter Abundance of Carbonate in Lower Paleozoic) ; Key Laboratory Project of Gansu Province(1309RTSA041) ; Natural Sciences Foundation of China(41372156) ; "Western Light Project" of the Chinese Academy of Sciences (A New Method for Determining Organic Matter Abundance of Carbonate in Lower Paleozoic) ; Key Laboratory Project of Gansu Province(1309RTSA041) ; Natural Sciences Foundation of China(41372156) ; "Western Light Project" of the Chinese Academy of Sciences (A New Method for Determining Organic Matter Abundance of Carbonate in Lower Paleozoic) ; Key Laboratory Project of Gansu Province(1309RTSA041) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61866]  |
| 专题 | 地质与地球物理研究所_兰州油气中心 |
| 通讯作者 | Wang, Xiaofeng |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Key Lab Petr Resources Gansu Province, 382 Donggang West Rd, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China 3.Shaanxi Yanchang Petr Grp Co Ltd, 75 Keji 2 Rd, Xian 710075, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Meng, Qiang,Wang, Xiaofeng,Wang, Xiangzeng,et al. Gas geochemical evidences for biodegradation of shale gases in the Upper Triassic Yanchang Formation, Ordos Basin, China[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2017,179:139-152. |
| APA | Meng, Qiang.,Wang, Xiaofeng.,Wang, Xiangzeng.,Shi, Baoguang.,Luo, Xiaorong.,...&Liu, Peng.(2017).Gas geochemical evidences for biodegradation of shale gases in the Upper Triassic Yanchang Formation, Ordos Basin, China.INTERNATIONAL JOURNAL OF COAL GEOLOGY,179,139-152. |
| MLA | Meng, Qiang,et al."Gas geochemical evidences for biodegradation of shale gases in the Upper Triassic Yanchang Formation, Ordos Basin, China".INTERNATIONAL JOURNAL OF COAL GEOLOGY 179(2017):139-152. |
入库方式： OAI收割
来源：地质与地球物理研究所
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