IOCAS-IR  > 海洋地质与环境重点实验室
Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea
Wang, Xiujuan1,2,3; Liu, Bo1,2,4; Qian, Jin1,2,3; Zhang, Xin1,2; Guo, Yiqun5; Su, Pibo5; Liang, Jinqiang5; Jin, Jiapeng1,2,4; Luan, Zhendong1,2; Chen, Duanxin1,2,3; Xi, Shichuan1,2,4; Li, Chaolun1,2
2018-12-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume168Pages:27-37
Corresponding AuthorWang, Xiujuan(wangxiujuan@qdio.ac.cn)
AbstractSeafloor features, seismic amplitude anomaly, geophysical attributes, and chemosynthetic community are different in the methane seepage areas of Taixinan Basin, South China Sea. We integrate the new acquired seafloor images with seismic data to present the differences of three cold seeps which are associated with fluid flows. These three cold seeps include two inactive sites (CS02-8 and CS02-9) and one active site (Site F). At site CS02-8 area, the seafloor carbonate and buried carbonate layer are identified from core samples at Site GMGS2-08. BSR is interrupted by the upward migration of fluids from the base of gas hydrate stability zone (BGHSZ) and gas hydrate-bearing sediments show pull-up seismic reflections below the buried carbonate layer. At site CS02-9 area, near seafloor carbonate was found at hole GMGS2-09B where a 62 m-high pinnacle and gas hydrate were also found from the core samples. The LWD data at hole 09A indicate that free gas is present below the depth of 64 m without gas hydrate. The average saturations of free gas estimated from P-wave velocity are about 3% with a patchy distribution and 0.3% with homogenous distribution respectively, which is accord with the enhanced reflection below BGHSZ. At Site F area, the exposed gas hydrate, carbonate and flourishing chemosynthetic communities are detected using ROV with a high amplitude seismic reflection at seafloor. The BSR is interrupted by a chimney structure from the seismic data which indicates that the fluids are migrating vertically and rise to the seafloor as gas bubbles. The geophysical evidence at these three seep sites show that pore-filling gas hydrates with saturations ranging from 10% to 40% are widely distributed above the BSR. However, massive or vein gas hydrates only occur around cold seeps.
KeywordMethane seepage Gas hydrate Free gas Saturation Fluid flow Taixinan Basin
DOI10.1016/j.jseaes.2017.11.011
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences' Strategic Priority Research Program, CAS[XDA11030102] ; China Geological Survey Project for South China Sea Gas Hydrate Exploration of GMGS[DD20160211] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41676040]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000452945000004
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/155799
Collection海洋地质与环境重点实验室
Corresponding AuthorWang, Xiujuan
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Guangzhou Marine Geol Survey, MLR, Guangzhou 510760, Guangdong, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang, Xiujuan,Liu, Bo,Qian, Jin,et al. Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:27-37.
APA Wang, Xiujuan.,Liu, Bo.,Qian, Jin.,Zhang, Xin.,Guo, Yiqun.,...&Li, Chaolun.(2018).Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,27-37.
MLA Wang, Xiujuan,et al."Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):27-37.
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