- 责任者：Hu Gaowei (Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology ; Ministry of Land and Resources ; Qingdao 266071 ; China) ; Ye Yuguang
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(6)
- 关键词：天然气水合物 ; gas hydrates ; 南海 ; South China Sea
- 页码：p.1112-1118
- 图表：8 illus., 36 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
Gas hydrate has been recognized to be a potential energy resource in the South China Sea minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（SCSminor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">） and the acoustic response of gas hydrate formations in the SCS sediments is of significance in the regional hydrate investigation and quantification. We conducted a simulation experiment to investigate the acoustic response of hydrate formations in the Shenhu area of the SCS using a new bender- element detection technique combined with the casing time-domain reflectometry minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（TDRminor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">）. The results showed that the acoustic signal becomes weaker with the occurrence of hydrates as the saturation of hydrates minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（Shminor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">） ranges from 0 to 14% ; then it strengthens gradu- ally as Sh is higher than 14%. The acoustic velocities minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（vp, vsminor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">） of sediments increase with the increase of Sh during hydrate formation and vs increases relatively faster as Sh becomes higher than 14%. These phenomena indicated that hydrates may form firstly in pore fluids in the form of tiny particles, which results in a weaker acoustic signal due to the considerable scattering attenuation of acoustic wave, but has little effect on shear modulus. As time lapses, when Sh exceeds 14%, numerous tiny particles of hydrates coalesce to- gether and contact with sediment particles. As a result, vs has a sharp increase.