| Quantitative seismic characterization for gas hydrate- and free gas-bearing sediments in the Shenhu area, South China sea | |
| Qian, Jin1,2,3; Kang, Dongju4; Jin, Jiapeng1,2; Lin, Lin4; Guo, Yiqun4; Meng, Mianmo5; Wang, Zhaoqi6; Wang, Xiujuan1,2,3 | |
| 2022-05-01 | |
| 发表期刊 | MARINE AND PETROLEUM GEOLOGY
 |
| ISSN | 0264-8172 |
| 卷号 | 139页码:13 |
| 通讯作者 | Qian, Jin([email protected]) ; Kang, Dongju([email protected]) |
| 摘要 | During China's first gas hydrate drilling expedition, a gas hydrate-bearing layer (GHBL) of asymptotic to 25 m thickness was identified above a bottom-simulating reflection (BSR) at site SH2 in the Shenhu area, South China Sea. This study considers the GHBL and the underlying free gas-bearing layer (FGBL) as a whole and evaluates them using quantitative seismic characterization. The reprocessed seismic data, correlated to well log data, reveal the BSR to be accompanied by newly-identified reflections of positive polarity from the top of the GHBL and the base of the FGBL. Of note are phase reversals along individual reflections that cross the top of the GHBL and the base of the FGBL. Phase reversals at the top of the GHBL are a previously little known seismic feature, and seismic forward modeling shows them to provide a direct indicator for the presence of gas hydrate. Amplitude versus offset (AVO) analysis indicates that the two new reflections have characteristics distinct from those of the BSR. Gas hydrate and free gas saturations derived by AVO analysis and seismic impedance inversion, respectively, are consistent with values estimated from sonic velocities, chloride anomalies and pressure cores. The saturations calculated from acoustic impedance inversion show that both gas hydrate and free gas of high saturation are discontinuous, and that free gas has a clear stratified distribution. The distribution of gas hydrate is generally consistent with that of free gas below the BSR, indicating that gas hydrate near site SH2 is mainly controlled by free gas in the underlying FGBL. The quantitative interpretation presented in this study provides a new and reliable method for the characterization of gas hydrate-bearing sediments in areas with no wells, and for the pre-drilling assessment of free gas hazard. |
| 关键词 | Gas hydrate Free gas Phase reversal AVO characteristics Quantitative seismic characterization |
| DOI | 10.1016/j.marpetgeo.2022.105606 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[42076072]; National Natural Science Foundation of China[41676040]; National Natural Science Foundation of China[41676041]; National Key R&D Program of China[2017YFC0307601] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000780388100001 |
| 出版者 | ELSEVIER SCI LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/178796 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Qian, Jin; Kang, Dongju |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Guangzhou Marine Geol Survey, MNR, Guangzhou 510760, Peoples R China 5.China Univ Petr East China, Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China 6.PetroChina, Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Qian, Jin,Kang, Dongju,Jin, Jiapeng,et al. Quantitative seismic characterization for gas hydrate- and free gas-bearing sediments in the Shenhu area, South China sea[J]. MARINE AND PETROLEUM GEOLOGY,2022,139:13. |
| APA | Qian, Jin.,Kang, Dongju.,Jin, Jiapeng.,Lin, Lin.,Guo, Yiqun.,...&Wang, Xiujuan.(2022).Quantitative seismic characterization for gas hydrate- and free gas-bearing sediments in the Shenhu area, South China sea.MARINE AND PETROLEUM GEOLOGY,139,13. |
| MLA | Qian, Jin,et al."Quantitative seismic characterization for gas hydrate- and free gas-bearing sediments in the Shenhu area, South China sea".MARINE AND PETROLEUM GEOLOGY 139(2022):13. |
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