Abstract:Median filtering is a effective measure for separating VSP wave field.Its procedure is as follow.(1)the waves to be separated(up- going wave or downgoing wave)are aligned by time shift correction,(2) the seismic traces are then input to median filter.(3) the input traces are grouped in every five traces,each one being taken as the mid trace in turn(the input traces can also be grouped in other odd number traces).(4) in every group, the five amplitudes of the wave to be separated are rearranged according to their real value,then the median amplitude is taken as the output of median炙 filter.If the output traces have quite uniform amplitudes of the wave to be separated,the median filtering effect is desirable.To obtain better result,more traces should be taken in a group,Howev}er,too many traces may cause more null side traces, which can influence the effect of median filtering.Median filtering can highlight wave band better than 2一D velocity filtering does,It also causes a setter VSP wave field separation.
收稿日期: 1984-09-12
引用本文:
姜天平. 多道中值滤波在分离VSP波场中的应用[J]. 石油地球物理勘探, 1985, 20(4): 433-437.
Jiang Tianping. Median filtering applied to the separation of VSP wave fief. OGP, 1985, 20(4): 433-437.