Application Of Frequency Division AVO Analysis In The Exploration Of Gas Hydrate

East China Sea is one of the continental margin sea in the Western Pacific. It is rich in oil and gas resources result from a lot of sediment from land sources and thick layers of sedimentary strata. At the same time,the East China Sea located between the Eurasian Plate and the Pacific plate subduction,collision and transition zone where volcanic and earthquakes are frequent. It is an important area of plate tectonics and marine oil and gas resources exploration.The accumulation of the gas hydrate is analyzed through the existing seismic data,sea temperature data from the sediment source,the thickness of sedimentary strata,source rocks,deposition rate,sea floor temperature,pressure conditions and so on. It is thought rich of sediments,thick sediment and potential of source rocks. Diapir,anticlline and the other regional structures and the gridded fault system which are common in the Okinawa Trough Basin provid favorable conditions for gas upward and lateral migration. It is a favorable zone for gas hydrate. The East China Sea has a bright prospect for gas hydrate discovery from the identified BSR.The research methods in the paper are applied through AVO intercept,gradient,Poisson's ratio reflectivity,fluid factor and compression and shear wave velocity reflectivity obtained from AVO weighted stack inversion methods. AVO anomaly which is detected by cross plot analysis and AVO characteristics curve analysis is used to detect gas hydrate. The main content is careful analysis in multi-channel seismic profiles in particular the one with BSR. This paper carried out the following works based on the BSR found in conventional seismic processing. First of all,seismic data interpretation. Second , gas hydrate identification symbol deserved from the relationship between gas hydrate and seismic characteristics. Last,multi-attribute seismic characteristics obtained from frequency division AVO analysis and AVO inversion. Studies have shown the AVO inversion of the specially processed marine seismic data can accurately response the anomaly.properties of gas hydrate.