High frequency compensation in high resolution seismic data acquisition
YUAN Zi\|long 1, HU Ya\|hua 2, CAO Guang\|hua 1 ( 1. Geoscience College, Daqing Petroleum Institute, Anda, Heilongjiang 151400, China; 2. Daqing Geophysical Prospecting Company, Daqing, Heilongjiang 163357, China )
To cope with the problem of low resolution in seismic prospecting caused by high frequency absorption of strata, three kinds of filters and their high frequency compensation principle and effects have been discussed in this paper. Low\|cut filters (LCF) with relatively high cut\|off frequency give rise to the high frequency signal by attenuating its low frequency portion relatively, they have relatively high compensation rate, thus can improve the resolution of seismic prospecting effectively. but they also have the side effects due to the shortage of necessary low frequency contents after filtering. Spectrum shaping filter has low compensation rate and it has very low compensation in high frequency, thus it can not improve the resolution of seismic prospecting apparently. Spectrum equilibrium filter can compensate high frequency absolutely and has high compensation rate, it can improve the resolution of seismic prospecting to a great extent.