| Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea | |
| Wang, Xiujuan; Wu, Shiguo; Xu, Ning; Zhang, Guangxue | |
| 2006-12-01 | |
| 发表期刊 | TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
 |
| ISSN | 1017-0839 |
| 卷号 | 17期号:4页码:799-813 |
| 文章类型 | Article |
| 摘要 | Bottom-simulating reflectors (BSRs) were observed beneath the seafloor in the northern continental margin of the South China Sea (SCS). Acoustic impedance profile was derived by Constrained Sparse Spike Inversion (CSSI) method to provide information on rock properties and to estimate gas hydrate or free gas saturations in the sediments where BSRs are present. In general, gas hydrate-bearing sediments have positive impedance anomalies and free gas-bearing sediments have negative impedance anomalies. Based on well log data and Archie's equation, gas hydrate saturation can be estimated. But in regions where well log data is not available, a quantitative estimate of gas hydrate or free gas saturation is inferred by fitting the theoretical acoustic impedance to sediment impedance obtained by CSSI. Our study suggests that gas hydrate saturation in the Taixinan Basin is about 10 - 20% of the pore space, with the highest value of 50%, and free gas saturation below BSR is about 2 - 3% of the pore space, that can rise to 8 - 10% at a topographic high. The free gas is non-continuous and has low content in the southeastern slope of the Dongsha Islands. Moreover, BSR in the northern continental margin of the SCS is related to the presence of free gas. BSR is strong where free gas occurs.; Bottom-simulating reflectors (BSRs) were observed beneath the seafloor in the northern continental margin of the South China Sea (SCS). Acoustic impedance profile was derived by Constrained Sparse Spike Inversion (CSSI) method to provide information on rock properties and to estimate gas hydrate or free gas saturations in the sediments where BSRs are present. In general, gas hydrate-bearing sediments have positive impedance anomalies and free gas-bearing sediments have negative impedance anomalies. Based on well log data and Archie's equation, gas hydrate saturation can be estimated. But in regions where well log data is not available, a quantitative estimate of gas hydrate or free gas saturation is inferred by fitting the theoretical acoustic impedance to sediment impedance obtained by CSSI. Our study suggests that gas hydrate saturation in the Taixinan Basin is about 10 - 20% of the pore space, with the highest value of 50%, and free gas saturation below BSR is about 2 - 3% of the pore space, that can rise to 8 - 10% at a topographic high. The free gas is non-continuous and has low content in the southeastern slope of the Dongsha Islands. Moreover, BSR in the northern continental margin of the SCS is related to the presence of free gas. BSR is strong where free gas occurs. |
| 关键词 | Gas Hydrate Free Gas Saturation Acoustic Impedance South China Sea |
| 学科领域 | Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Oceanography |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000243814800011 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/5134 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.China Univ Petr, Dongying, Peoples R China 4.MLR, Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China 5.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiujuan,Wu, Shiguo,Xu, Ning,et al. Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea[J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2006,17(4):799-813. |
| APA | Wang, Xiujuan,Wu, Shiguo,Xu, Ning,&Zhang, Guangxue.(2006).Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea.TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,17(4),799-813. |
| MLA | Wang, Xiujuan,et al."Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea".TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES 17.4(2006):799-813. |
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