Acoustic response of gas hydrate formation in sediments from South China Sea

doi:10.1016/j.marpetgeo.2014.01.007

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局青岛海洋地质研究所

	Acoustic response of gas hydrate formation in sediments from South China Sea
	Hu, Gaowei 1,2; Ye, Yuguang 1,2; Zhang, Jian 1,2; Liu, Changling 1,2; Li, Qing 2
刊名	MARINE AND PETROLEUM GEOLOGY
	2014
卷号	52 页码:1-8
关键词	Gas hydrate South China Sea (SCS) Acoustic response Bender element Time domain reflectometry (TDR)
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2014.01.007
英文摘要	Gas hydrate has been recognized as a potential energy resource in South China Sea (SCS). Understanding the acoustic response of gas hydrate formation in the SCS sediments is essential for regional gas hydrate investigation and quantification. The sediments were obtained from gravity core sampling at E 115 degrees 12.52363' N 19 degrees 48.40299'. Gas hydrate was formed within a "gas + water-saturated SCS sediments" system. Combination of a new bender element technique and coated time domain reflectometry (TDR) was carried out to study the acoustic response of hydrate occurrence in SCS sediments. The results show the acoustic signal becomes weak when hydrate saturation (S-h) is lower than 14%. The acoustic velocities (Vp, Vs) of the sediments increase with S-h during hydrate formation, and Vs increases relatively faster when S-h is higher than 14%. These results indicate that tiny hydrate particles may firstly float in the pore fluid, which causes a significant acoustic attenuation, but has little influence on shear modulus. As time lapses and S-h approaches 14%, numerous particles coalesce together and contact with sediment particles. As a result, Vs has a sharp increase when hydrate saturation exceeds 14%. Several velocity models were validated with the experimental data, which suggests a combination of the BGTL (Biot-Gassmann Theory modified by Lee) model and the Weighted Equation is suitable to estimate S-h in SCS. (C) 2014 Elsevier Ltd. All rights reserved.
学科主题	油气地质
WOS关键词	BEARING SEDIMENTS ; METHANE-HYDRATE ; MACKENZIE DELTA ; ATTENUATION ; WELL ; FLUID ; VELOCITIES ; PRESSURE ; CANADA
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000334089300001
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40315]
专题	中国地质调查局青岛海洋地质研究所
作者单位	1.Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Shandong, Peoples R China 2.Minist Land & Resources, Key Lab Gas Hydrate, Qingdao 266071, Shandong, Peoples R China 3.Qingdao Inst Marine Geol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Hu, Gaowei,Ye, Yuguang,Zhang, Jian,et al. Acoustic response of gas hydrate formation in sediments from South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2014,52:1-8.
APA	Hu, Gaowei,Ye, Yuguang,Zhang, Jian,Liu, Changling,&Li, Qing.(2014).Acoustic response of gas hydrate formation in sediments from South China Sea.MARINE AND PETROLEUM GEOLOGY,52,1-8.
MLA	Hu, Gaowei,et al."Acoustic response of gas hydrate formation in sediments from South China Sea".MARINE AND PETROLEUM GEOLOGY 52(2014):1-8.