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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XU Yun-Xia, WEN Peng-Fei, ZHANG Bao-Jin, LIU Bin. The application of OBS to the identification of hydrate in Qiongdongnan (southern Hainan) sea area. Geophysical and Geochemical Exploration, 2020, 44(6): 1276-1282.
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