保幅Kirchhoff弯曲射线叠前时间偏移技术在天然气水合物三维地震资料处理中的应用  

Application of Amplitude-preserving Kirchhoff Curved-ray PSTM in Gas Hydrates 3D Seismic Data Processing

作　　者：陈玺[1] 杨振[1] 文鹏飞[1] 张宝金[1] CHEN Xi;YANG Zhen;WEN Pengfei;ZHANG Baojin(MLR Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey, Guangzhou 510760,China)

机构地区：[1]国土资源部海底矿产资源重点实验室广州海洋地质调查局,广州510075

出　　处：《华南地震》2019年第1期7-11,共5页South China Journal of Seismology

基　　金：国家自然科学基金(41606030);国家重点研发计划课题(2017YFC0307405)

摘　　要：天然气水合物的富集往往与断裂、底辟及泥火山等构造有关,这就要求地震成像要精确,而针对水合物的地震处理又要以保真保幅为前提,因此快速高效而又有较高成像质量的的保幅Kirchhoff弯曲射线叠前时间偏移技术被广泛应用于三维水合物资料处理中。与直射线Kirchhoff叠前时间偏移技术相比,弯曲射线Kirchhoff叠前时间偏移同样具有快速高效的特点,同时成像精度在一定程度上可媲美叠前深度偏移。在实际资料的应用中可发现,基于保幅Kirchhoff弯曲射线叠前时间偏移技术处理的地震剖面可精确地刻画气体通道,有利于天然气水合物富集区的识别。The enrichment of natural gas hydrate is often associated with fractures,diapirs and mud volcano structures,which requires accurate seismic imaging,and the processing for the gas hydrate seismic needs amplitude-preserved,so the fast and efficient amplitude-preserving Kirchhoff curved-ray pre-stack time migration technology with higher quality image is widely used in the data processing of 3D seismic exploration for hydrate. Compared with the straight-ray Kirchhoff pre-stack time migration technique,the curved-ray Kirchhoff pre-stack time migration is also fast and efficient,and the imaging accuracy is comparable to the pre-stack depth migration in a way. In the application of actual data,it can be found that the gas channel can be distinguished accurately from the seismic section processed by amplitude-preserving Kirchhoff curved-ray pre-stack time migration technique,and the section is helpful to identify the enrichment area of gas hydrate.

关 键 词：天然气水合物 地震处理 保幅 弯曲射线 层速度 KIRCHHOFF叠前时间偏移 

分 类 号：P315[天文地球—地震学]