| The characteristics of BSRs and their derived heat flow on the profile 973 in the northeastern South China Sea | |
Song Hai-Bin; Wu Shi-Guo; Jiang Wei-Wei
| |
| 2007-09-01 | |
| 发表期刊 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| ISSN | 0001-5733 |
| 卷号 | 50期号:5页码:1508-1517 |
| 文章类型 | Article |
| 摘要 | Processing of a recently acquired seismic line in the northeastern South China Sea by Project 973 has been conducted to study the character and the distribution of gas hydrate Bottom-Simulating Reflectors (BSRs) in the Hengchun ridge. Analysis of different-type seismic profiles shows that the distribution of BSRs can be revealed to some extents by single-channel profile in this area, but seismic data processing plays an important role to resolve the full distribution of BSRs in this area. BSR' s in the northeastern South China Sea have the typical characteristics of BSRs on worldwide continental margins: they cross sediment bed reflections, they are generally parallel to the seafloor and the associated reflections have strong amplitude and a negative polarity. The characteristics of BSRs in this area are obvious and the BSRs indicate the occurrence of gas hydrate-bearing sediments in the northeastern South China Sea. The depth of the base of the gas-hydrate stability zone was calculated using the phase stability boundary curve of methane hydrate and gas hydrate with mixture gas composition and compared with the observed BSR depth. If a single gradient geothermal curve is used for the calculation, the base of the stability zone for methane hydrate or gas hydrate with a gas mixture composition does not correspond to the depth of the BSRs observed along the whole seismic profile. The geothermal gradient therefore changes significantly along the profile. The geothermal gradient and heat flow were estimated from the BSR data and the calculations show that the geothermal gradient and heat flow decrease from west to east, with the increase of the distance from the trench and the decrease of the distance to the island arc. The calculated 2 heat flow changes from 28 to 64 mW/m(2), which is basically consistent with the measured heat flow in southwestern offshore Taiwan.; Processing of a recently acquired seismic line in the northeastern South China Sea by Project 973 has been conducted to study the character and the distribution of gas hydrate Bottom-Simulating Reflectors (BSRs) in the Hengchun ridge. Analysis of different-type seismic profiles shows that the distribution of BSRs can be revealed to some extents by single-channel profile in this area, but seismic data processing plays an important role to resolve the full distribution of BSRs in this area. BSR' s in the northeastern South China Sea have the typical characteristics of BSRs on worldwide continental margins: they cross sediment bed reflections, they are generally parallel to the seafloor and the associated reflections have strong amplitude and a negative polarity. The characteristics of BSRs in this area are obvious and the BSRs indicate the occurrence of gas hydrate-bearing sediments in the northeastern South China Sea. The depth of the base of the gas-hydrate stability zone was calculated using the phase stability boundary curve of methane hydrate and gas hydrate with mixture gas composition and compared with the observed BSR depth. If a single gradient geothermal curve is used for the calculation, the base of the stability zone for methane hydrate or gas hydrate with a gas mixture composition does not correspond to the depth of the BSRs observed along the whole seismic profile. The geothermal gradient therefore changes significantly along the profile. The geothermal gradient and heat flow were estimated from the BSR data and the calculations show that the geothermal gradient and heat flow decrease from west to east, with the increase of the distance from the trench and the decrease of the distance to the island arc. The calculated 2 heat flow changes from 28 to 64 mW/m(2), which is basically consistent with the measured heat flow in southwestern offshore Taiwan. |
| 关键词 | Gas Hydrates Northeastern South China Sea Bottom-simulating Reflection Stability Zone Heat Flow |
| 学科领域 | Geochemistry & Geophysics |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000249679300027 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/5060 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song Hai-Bin,Wu Shi-Guo,Jiang Wei-Wei. The characteristics of BSRs and their derived heat flow on the profile 973 in the northeastern South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2007,50(5):1508-1517. |
| APA | Song Hai-Bin,Wu Shi-Guo,&Jiang Wei-Wei.(2007).The characteristics of BSRs and their derived heat flow on the profile 973 in the northeastern South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,50(5),1508-1517. |
| MLA | Song Hai-Bin,et al."The characteristics of BSRs and their derived heat flow on the profile 973 in the northeastern South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 50.5(2007):1508-1517. |
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