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Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan
Deng, H; Yan, P; Liu, HL; Luo, WZ; nhsdenghui@163.com
2006
发表期刊TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
ISSN1017-0839
卷号17期号:4页码:781-797
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.
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
关键词Gas Hydrate Bottom-simulating Reflector Seismic Imaging Avo Analysis Avo Inversion Offshore Southwestern Taiwan
学科领域Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Oceanography
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000243814800010
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4380
专题中科院边缘海地质重点实验室
通讯作者nhsdenghui@163.com
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GB/T 7714
Deng, H,Yan, P,Liu, HL,et al. Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan[J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2006,17(4):781-797.
APA Deng, H,Yan, P,Liu, HL,Luo, WZ,&nhsdenghui@163.com.(2006).Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan.TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,17(4),781-797.
MLA Deng, H,et al."Seismic data processing and the characterization of a gas hydrate bearing zone offshore of southwestern Taiwan".TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES 17.4(2006):781-797.
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