Processing of array sonic logging data with nulti-scale STC technique  

作　　者：Tao Guo He Fengjiang Yue Wenzheng Chen Ping 

机构地区：[1]CNPC Well Logging Key Laboratory, China University of Petroleum, Beijing 102249, China

出　　处：《Petroleum Science》2008年第3期238-241,共4页石油科学（英文版）

基　　金：National Natural Science Foundation of China (the project No.is 50674098);the National 863 Project of China (Grant 2006AA06Z207);theNational Basic Research Program of China (973 Program,2007CB209601).

摘　　要：It is desirable to develop new signal processing techniques for effectively extracting reflected waves under the strong interferences of borehole guided waves. We presented a multi-scale semblance method for the separation and velocity （slowness） analysis of the reflected waves and guided waves in borehole acoustic logging. It was specially designed for the newly developed tools with ultra-long source- receiver spacing for acoustic reflection survey. This new method was a combination of the dual tree com- plex wavelets transform （DT-CWT） and the slowness travel time coherence （STC） method. Applications to the 3D finite difference （FD） modeling simulated data and to the field array sonic waveform signals have demonstrated the ability of this method to appropriately extract the reflected waves under severe interference from the guided waves and to suppress noise in the time-frequency domain.It is desirable to develop new signal processing techniques for effectively extracting reflected waves under the strong interferences of borehole guided waves. We presented a multi-scale semblance method for the separation and velocity （slowness） analysis of the reflected waves and guided waves in borehole acoustic logging. It was specially designed for the newly developed tools with ultra-long source- receiver spacing for acoustic reflection survey. This new method was a combination of the dual tree com- plex wavelets transform （DT-CWT） and the slowness travel time coherence （STC） method. Applications to the 3D finite difference （FD） modeling simulated data and to the field array sonic waveform signals have demonstrated the ability of this method to appropriately extract the reflected waves under severe interference from the guided waves and to suppress noise in the time-frequency domain.

关 键 词：Borehole acoustic logging signal processing wavelet transform reflection survey 

分 类 号：O42[理学—声学]