Estimation method on arrival time of in-seam wave based on similarity ofwave-forms in common receiver gather

To accurately detect arrival times of transmitted in-seam waves which are damaged by wavelets of receivers, we analyzed the causes of differences of receiver wavelets, and propose a method to detect arrival time based on similarity of wave-forms in common receiver point gather. The method take advantage of the ability of receiver wavelet which can promote the similarity of wave-forms of same receivers, and compute the cross-correlation coefficient between every trace with other traces, and estimate arrival time of in-seam wave according to the similarity of wave-forms. Results of actual applications showed that in-seam waves in common receiver gather have great similarity to adjacent traces, and the estimated arrival times can show the irregularity of in-seam wave caused by faults. On the tomography computed using estimated arrival times, anomalous velocity regions are in accordance with actual faults.