P- to S-wave velocity ratio estimation as well as PP- and PS-waves matching in time or depth domain are the basic procedures for the imaging, inversion, and interpretation of multi component seismic data. Based on Dynamic Time Warping (DTW), we propose a three-step dynamic image warping algorithm which can be used to match PS- to PP-waves directly in time or depth domain of post-stack sections. With the second order symmetrical dynamic programming method, we first compute the total alignment errors of the double-way travel time or one-way depth for PP- and PS-waves. The warping window on total alignment errors is calculated with the maximum and minimum of the P- to S-wave velocity ratio to constrain the searching zone. We then search the optimal path within the warping window by using the recursive backtracking method. A maximum correlation coefficient criterion is applied to determine the best warping path. We finally calculate time- or depth-shifts between PP- and PS-images and match PS to PP post-stack section with the best shifts or the P- to S-wave velocity ratio calculated from the shifts. Our method is tested by using synthetic and field data from Xin Chang oil field. The results show that our method is effective and accurate in matching the PP- and PS-events, and could be further applied to the seismic data with low signal-to-noise ratio or weak similarity in different components.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 60 (3):1106-1117; 10.6038/cjg20170322 MAR 2017
Jiang Xue-Zhen; Lu Jun; Wang Yun
1. Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
2. Univ Chinese Acad Sci, Beijing 101407, Peoples R China
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