1. Northwest Branch Institute of Research Institute of Petroleum Exploration and Development,CNPC,Lanzhou City,Gansu Province,730020,China;
2. Institute of the Earth Recourses and Information,China University of Petroleum
Abstract：Normally when incidence is P-wave and angle of incidence is larger than critical angle,the phase distortion will be found in the angle gather record due to reflection coefficient change.In order to same phase stacking for seismic data,phase correction should be conducted before stacking.As the values of the phase angle and amplitude which will be applied in the correction are not the constant over the time windows,the angle gathers have to be processed in their individual windows.In this paper the constant phase correction were conducted in the individual windows,and correction for angle gather of model and real well data was also carried out by directly using waveform correction factor,and how the time window length affecting the correction results is analyzed as well.If comparing pre-correction angle gather records with the post-correction ones,it is easily found out that the two methods(the constant phase correction method in individual windows and the waveform correction factor method) work well,can correct the waveform distortion and can raise the quality of seismic stacking sections.
