Dual sources and consumption of methane in shallow sediments of southern SCS: Insight from porewater composition and numerical modeling
文献类型：期刊论文
| 作者 | Cao, Yiyun2,3; Jin, Guangrong2; Xu, Xing1; Yang, Peining2,4; Liu, Li2,3; Cheng, Sanshan2,3; Su, Zheng2; Liu, Lihua2 |
| 刊名 | MARINE AND PETROLEUM GEOLOGY
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 158页码:11 |
| 关键词 | Anaerobic oxidation of methane Reactive transport model Porewater geochemistry Beikang basin |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2023.106503 |
| 通讯作者 | Liu, Lihua(liulh@ms.giec.ac.cn) |
| 英文摘要 | Methane seepages have significant impacts on marine environments and ecosystems. Deep understanding of that is critical for the resources exploration and the climate change. Numerous merhane seepages have been reported worldwide, and mostly investigated on the slope and margin, with less attention paid to the basin. Here presents the determination of three sediment cores (1159, H79, and H55Y) retrieved in the Beikang Basin in the southern of the South China Sea (SCS), an important hydrocarbons and gas hydrates potential domain.A preliminary evaluation of the methane-related geochemical processes was obtained based on the compositions of porewater, and a reactive transport model was further developed to quantitively investigate the corresponding processes. The model results matched well the measurements. Both porewater compositions and model results indicated that anaerobic oxidation of methane dominantly consumed the sulfate at sites H55Y and H59, while sulfate was mainly consumed by organoclastic sulfate reduction at site H79. The shallow depths of SMI (3.8-7.8 mbsf), benthic methane fluxes (0.5-1.5 mmol I11-2 yr-1) and high AOM rates (37-103 mmol I11-2 yr-1) indicated the methane seepages at H55Y and H59. Model and sensitivity tests revealed further that the consumed methane was mainly supplied by external source, which ascended from deep reservoir, while insitt methanogenesis contributed only a negligible fraction. The deduced 813C of the external methane of H55Y demonstrated it was also microbial origin, which was probably contributed by the biogenic source rocks and/or dissociation of gas hydrates.The comprehensive regional research of the source and consumption of methane determined different seepage scenarios in the basin of southern SCS and enhanced our understanding of methane cycling in the marine basins. |
| WOS关键词 | PORE-WATER GEOCHEMISTRY ; ANAEROBIC OXIDATION ; CHINA SEA ; CONTINENTAL-SLOPE ; SULFATE PROFILES ; POSSIBLE LINK ; SEEP ACTIVITY ; MG/CA RATIOS ; BLAKE RIDGE ; HYDRATE |
| 资助项目 | NSF program[417760711] ; NSF program[2020B1111010004] ; Key-Area Research and Development Program of Guangdong Province[2019BT02L278] ; Guangdong Special Support Program[2019B030302004] ; Major Program of Guangdong Basic and Applied Research ; [42276086] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001108286300001 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | NSF program ; Key-Area Research and Development Program of Guangdong Province ; Guangdong Special Support Program ; Major Program of Guangdong Basic and Applied Research |
| 源URL | [http://ir.giec.ac.cn/handle/344007/40354]  |
| 专题 | 中国科学院广州能源研究所 |
| 通讯作者 | Liu, Lihua |
| 作者单位 | 1.Guangzhou Marine Geologkal Survey, Guangzhou 510760, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Yiyun,Jin, Guangrong,Xu, Xing,et al. Dual sources and consumption of methane in shallow sediments of southern SCS: Insight from porewater composition and numerical modeling[J]. MARINE AND PETROLEUM GEOLOGY,2023,158:11. |
| APA | Cao, Yiyun.,Jin, Guangrong.,Xu, Xing.,Yang, Peining.,Liu, Li.,...&Liu, Lihua.(2023).Dual sources and consumption of methane in shallow sediments of southern SCS: Insight from porewater composition and numerical modeling.MARINE AND PETROLEUM GEOLOGY,158,11. |
| MLA | Cao, Yiyun,et al."Dual sources and consumption of methane in shallow sediments of southern SCS: Insight from porewater composition and numerical modeling".MARINE AND PETROLEUM GEOLOGY 158(2023):11. |
入库方式： OAI收割
来源：广州能源研究所
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