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《Progress in Geophysics》 2013-04
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Time-frequency signature extraction and recognition of unconsolidated sediments containing gas hydrate and free gas in Shenhu area , Northern South China Sea

SUN Yun-bao1,2(1.Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China; 2.Key laboratory of Marine Hydrocarbon Resource and Geology,Qingdao Institute of Marine Geology,Qingdao 266071,China)  
The gas hydrate petroleum system in Shenhu Area of northern South China Sea is considered to be one of the promising targets for exploration and exploitation.Combining time-frequency information from seismic reflection data sets allows the analysis of anomalous reflections from very-shallow to great subsurface depths.Time-frequency analysis method enhances the imaging of subsurface features which have a frequency-dependent reflectivity such as hydrate and gas.The interpretation method has been used to our study area.The seismic imagery shows several anomalous reflection amplitudes,such as low frequency low intensity anomalies,low frequency high intensity anomalies,high frequency low intensity anomalies,high frequency high intensity anomalies,low frequency blackout anomalies and high frequency blackout anomalies.Research result shows that low frequency low intensity anomalies and high frequency low intensity or high frequency high intensity anomalies overlying low frequency high intensity and high frequency low intensity or high frequency blackout anomalies may be attributed to the occurrence of gas hydrate.We conclude that this technique has a good potential to assist seismic study of structures associated with gas hydrates accumulations.
【Fund】: 中国博士后基金(资助编号:2012M521296);; 中国地质调查局国家专项工作项目(编号:GZH201100308)联合资助
【CateGory Index】: P744.4
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