| Thermogenic gas controls high saturation gas hydrate distribution in the Pearl River Mouth Basin: Evidence from numerical modeling and seismic anomalies | |
Sun, Luyi1,2,3,4; Wang, Xiujuan1,2,3,4,5; He, Min5; Jin, Jiapeng1,2,3,4; Li, Jie5 ; Li Yuanping5; Zhu, Zhenyu6; Zhang, Guangxu1,2,3
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| 2020-12-01 | |
| 发表期刊 | ORE GEOLOGY REVIEWS
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| ISSN | 0169-1368 |
| 卷号 | 127页码:16 |
| 通讯作者 | Wang, Xiujuan(wangxiujuan@qdio.ac.cn) |
| 摘要 | We integrate three-dimensional (3D) seismic data, well log and two-dimensional (2D) modeling to understand the accumulation and saturation of gas hydrates and their relationships with biogenic and thermogenic gases in the Pearl River Mouth Basin, South China Sea (Sites SH2, SH5, W17, and W19). The model based on physical, geochemical and geological parameters from shallow gas hydrate sites, deep oil sites and seismic interpretation, and it is tied to well-log and seismic quantitative interpretation, to predict the main controlling factors for gas hydrate distribution. The modeling results show that the biogenic methane generation is distributed within the strata shallower than 1500 mbsf (meters below the seafloor), whereas thermogenic gas generation ranges from 2300 mbsf to 6000 mbsf. The erosion surfaces of migrating canyons represent important pathways for upward migration of biogenic gas resulting in average hydrate saturation 20% below the ridges of canyons. The total organic carbon content is an important factor related to biogenically-sourced gas hydrate distribution. Higher gas saturation ( 40%) at the base of gas hydrate stability zone (BGHSZ) is related to the focused migration of thermogenic gas along faults and throughout permeable carrier beds. Although gas chimneys are widely identified from the coherence attribute extracted from 3D seismic data, their impact on the obviously higher (locally up to 60%) gas hydrate saturations in the fine-grained sediments appears site-dependent and associated with fault activity. By comparing well log-derived gas hydrate saturations, our modeling shows that about 80% of the methane-forming hydrate is thermogenically-sourced at Sites W19 and W17. The integrated modeling effort presented in this work, based on provides a better understanding of the different contributions from different gas sources for gas hydrate accumulation along the northern slope of the South China Sea. |
| 关键词 | Gas hydrate Erosion surface Gas chimney Upward migration The Pearl River Mouth Basin |
| DOI | 10.1016/j.oregeorev.2020.103846 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key Research and Development Program of China[2017YFC0307301-1] ; National Natural Science Foundation of China, China[41676041] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0104] |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:000598889300002 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/169555 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Wang, Xiujuan |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.CNOOC China Ltd, Shenzhen Branch, Shenzhen 518054, Peoples R China 6.CNOOC Res Inst Co Ltd, Beijing 100028, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 深海极端环境与生命过程研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 深海极端环境与生命过程研究中心 |
| 推荐引用方式 GB/T 7714 | Sun, Luyi,Wang, Xiujuan,He, Min,et al. Thermogenic gas controls high saturation gas hydrate distribution in the Pearl River Mouth Basin: Evidence from numerical modeling and seismic anomalies[J]. ORE GEOLOGY REVIEWS,2020,127:16. |
| APA | Sun, Luyi.,Wang, Xiujuan.,He, Min.,Jin, Jiapeng.,Li, Jie.,...&Zhang, Guangxu.(2020).Thermogenic gas controls high saturation gas hydrate distribution in the Pearl River Mouth Basin: Evidence from numerical modeling and seismic anomalies.ORE GEOLOGY REVIEWS,127,16. |
| MLA | Sun, Luyi,et al."Thermogenic gas controls high saturation gas hydrate distribution in the Pearl River Mouth Basin: Evidence from numerical modeling and seismic anomalies".ORE GEOLOGY REVIEWS 127(2020):16. |
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