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.
徐云霞, 文鹏飞, 张宝金, 刘斌. OBS在琼东南海域水合物矿体识别中的应用[J]. 物探与化探, 2020, 44(6): 1276-1282.
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.
Wang Y L, Yan P. Lateral resolution analysis of deep crustal sounding:A case study on the data form ocean bottom seismometers in the northern South China Sea[J]. Chinese Journal of Geophysics, 2009,52(9):2282-2290.
Ruan A, Wei X. Crustal structure and fracture zone in the central sea basin of the South China Sea from wide angle seismic experiments using OBS[J]. Tectonophysics, 2016: 1-10.
Stopin A, Hatchell P J, Beal E, et al. Results from the first OBS to OBS time-lapse survey in the Mars Basin[C]// SEG Annual Meeting, 2011.