IOCAS-IR  > 海洋地质与环境重点实验室
Gas hydrate accumulation and saturations estimated from effective medium theory in the eastern Pearl River Mouth Basin, South China Sea
Qian, Jin1,2,3; Wang, Xiujuan1,2,3; Collett, Timothy S.4; Dong, Dongdong1,2,5; Guo, Yiqun6; Su, Pibo6; Liang, Jinqiang6
2017-08-01
Source PublicationINTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
Volume5Issue:3Pages:SM33-SM48
SubtypeArticle
AbstractPore-and fracture-filling gas hydrates were identified from the core samples at several sites during the second Guangzhou Marine Geological Survey (GMGS2) expedition. Well logs indicated that gas hydrate occurred in three distinct layers at site GMGS2-08. The gas hydrate saturations calculated from well-log data and the seismic responses for the three gas hydrate-bearing layers, especially within the middle carbonate layer, were poorly known. We estimated gas hydrate saturations using isotropic and anisotropic models based on the mineral composition of the sediments and the effective medium theory. In the upper and lower gas hydrate-bearing layers, saturations estimated from anisotropic models are close to those estimated from pressures cores and chlorinity data. The average saturation using an anisotropic model in the upper (fracture-dominated) hydrate layer is approximately 10% with a maximum value of 25%. In the lower (fracture-dominated) layer, the horizontal and vertical gas hydrate-filled fractures and visible gas hydrate were formed with a maximum saturation of approximately 85%. For the middle layer, well logs show high P-wave velocity, density, high resistivity as well as low gamma ray, porosity, and drilling rate, together indicating a carbonate layer containing gas hydrate. The hydrate saturations calculated from isotropic models assuming hydrate formed at grain contacts are less than 20%, which fit well with two values calculated from chlorinity data for this layer. The upper gas hydrate layer shows no clear seismic response and probably consisted of small fractures filled with gas hydrate. The middle carbonate and lower fracture-filled gas hydrate-bearing layers show pull-up reflections, with the carbonate layer exhibiting relatively higher amplitudes. Pore-filling gas hydrate was also identified just above the depth of the bottom-simulating-reflector (BSR) from the GMGS2-05 drill site. Below the BSR, the push-down reflections, polarity reversal, and enhanced reflections indicate the occurrence of free gas in the study area.
DOI10.1190/INT-2016-0217.1
Indexed BySCI
Language英语
WOS IDWOS:000409910400044
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/143163
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
4.US Geol Survey, Denver Fed Ctr, Denver, CO USA
5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
6.MLR, Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China
First Author Affilication中国科学院海洋研究所
Recommended Citation
GB/T 7714
Qian, Jin,Wang, Xiujuan,Collett, Timothy S.,et al. Gas hydrate accumulation and saturations estimated from effective medium theory in the eastern Pearl River Mouth Basin, South China Sea[J]. INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,2017,5(3):SM33-SM48.
APA Qian, Jin.,Wang, Xiujuan.,Collett, Timothy S..,Dong, Dongdong.,Guo, Yiqun.,...&Liang, Jinqiang.(2017).Gas hydrate accumulation and saturations estimated from effective medium theory in the eastern Pearl River Mouth Basin, South China Sea.INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,5(3),SM33-SM48.
MLA Qian, Jin,et al."Gas hydrate accumulation and saturations estimated from effective medium theory in the eastern Pearl River Mouth Basin, South China Sea".INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION 5.3(2017):SM33-SM48.
Files in This Item:
File Name/Size DocType Version Access License
Gas hydrate accumula(8499KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Qian, Jin]'s Articles
[Wang, Xiujuan]'s Articles
[Collett, Timothy S.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Qian, Jin]'s Articles
[Wang, Xiujuan]'s Articles
[Collett, Timothy S.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Qian, Jin]'s Articles
[Wang, Xiujuan]'s Articles
[Collett, Timothy S.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Gas hydrate accumulation and saturations estimated from effective medium theory in the eastern Pearl River Mouth Basin.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.