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学科主题: Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; Oceanography
题名: Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan
作者: Deng, H ; Yan, P ; Liu, HL ; Luo, WZ
通讯作者: nhsdenghui@163.com
关键词: gas hydrate ; bottom-simulating reflector ; seismic imaging ; AVO analysis ; AVO inversion ; offshore southwestern Taiwan
刊名: TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
发表日期: 2006
卷: 17, 期:4, 页:781-797
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou, Guangdong, Peoples R China; Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou, Guangdong, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing, Peoples R China; Sinopec Int Petr Explorat & Prod Corp, Beijing, Peoples R China
项目归属: 海洋地质
摘要: Various seismic attributes of gas hydrate bearing sediments were analyzed in the accretionary prism offshore of southwestern Taiwan utilizing seismic imaging, velocity analysis, AVO analysis, and AVO inversion of large offset seismic data. A bottom-simulating reflector (BSR) is clearly observed on the seismic section with a reversed polarity compared to that of the seabed reflection. Instantaneous amplitude sectioning clearly shows lateral variations of the BSR. The zero-phase waveform of the BSR is distinct and the weak reflectors above the BSR can be observed on the instantaneous phase section. AVO analysis shows the absolute value of the negative BSR amplitude increasing with offset. A low P-wave interval velocity layer was found below the strong BSR by detailed velocity analysis. Both the P (normal incident P-wave reflection coefficient) and G (AVO gradient) values are highly negative for the strong BSR on the P and G sections, and they lie in the third quadrant of the P and G cross-plot section. The P+G (reflectivity of Poisson's ratio) value is also negative on the P+G section and the P-G (normal incident S-wave reflection coefficient) value is approximately zero on the P-G section along the same strong BSR. All the seismic characters described above suggest that a gas hydrate layer exists together with a free gas layer below it along strong BSRs in the area offshore southwestern Taiwan.
原文出处: 查看原文
WOS记录号: WOS:000243814800010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4380
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Deng, H; Yan, P; Liu, HL; Luo, WZ.Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan,TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2006,17(4):781-797
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