Abstract：There are 3 advantages for the uneven frequency sampling linear frequency modulation transform method:(1):The frequency sample for arbitrary points in unit circle could be calculated,in addition,the initial frequency could be randomly set up,(2):The number of the frequency samples could be different from the number of the input data,so the calculation points could be dramatically decreased,(3).The frequency sampling rate could be very small so the frequency could be zoomed.The 3 advantages bring obvious superiority in removing single frequency interference.Although the routine time-domain suppression method and the Chrip-Z transform method could suppress 50 Hz industrial interference(single-frequency interference),but for vast amount of seismic data,their efficiency are low and they cost too much time.The linear frequency modulation spectrum analysis method could conduct calculation for the data in a very narrow frequency bandwidth and with uneven frequency sampling spectrum,by calculating 43 linear frequency modulation spectrum samples,the single frequency interference frequency with 0.001Hz frequency precision could be rapidly determined,while by 54 times frequency scanning,the single frequency interference frequency with 0.0001Hz frequency precision could be determined,as a result the single frequency interference could be removed.The processing for theoretical data and field data show that the method suppresses the single frequency interference while it does not harm effective signal with other frequency component,the effective signal could be kept well at the interference frequency,the method could highly raise calculation efficiency,it is an effective method to remove single frequency interference in high fold and high density 3d seismic data processing.
