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| The application of OBS to the identification of hydrate in Qiongdongnan (southern Hainan) sea area |
XU Yun-Xia1,2( ), WEN Peng-Fei2, ZHANG Bao-Jin2, LIU Bin2 |
1. Guangzhou Marine Geological Survey,CGS,Guangzhou 510760,China
2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou 511458,China |
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Abstract OBS can enrich the information of the underground structure by obtaining the information of the P-wave and the PS wave,and can obtain the information related to the characteristics of the lithology and the fluid,and reduce the non-uniqueness in the interpretation of the hydrate.In this paper,according to the feature of OBS data,the authors obtained the PP and PS velocity information and common reflection point imaging by repositioning,redirection,wave field separation,mirror image migration,RT rotation,transversal wave migration and other techniques.On such a basis,the authors conducted the P-S wave joint inversion,obtained P-wave impedance as well as S-wave impedance.Through joint interpretation,the authors identified the true distribution area of free gas,and improved the recognition accuracy of fluid characteristics related to hydrates.
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Received: 23 October 2019
Published: 29 December 2020
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The figure of OBS and acquisition line
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The main technology of OBS imaging processing
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The distance between before and after reposition
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The result of reposition before(a) and after(b)
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The result of the wave field separation
a—P component;b—calibrated Z component;c—up going field;d—down going field
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The result of CRP imaging with up going(a) and down going(b)
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The result of polarization
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The section of gamma(a) and vps(b)
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The imaging result of PS
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The joint inversion result
a—the sonic wave impedance;b—the shear wave impedance
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