The Study Of Registration For PP And PS Seismic Data

After having been greatly improved in the last 30 years,now multi-wave seismic exploration is one of the most important techniques in petrol geophysics.Compared with the PP seismic data,multi-wave seismic data can provide us with more subsurface information.And we must have a well registration of the PP and PS waves before the joint inversion and interpretation of the multi-wave seismic data.However,for the difference between the propagation of different waves,the registration of the PP and PS waves based on interpreters' experience still has some mistakes.So it of high value to study the automatic registration of multi-wave seismic data.This dissertation is focused on matching the PP and PS waves.Beginning from the study of the different mechanisms of the propagations for multi-wave seismic data,we point out that the different polarities of PP and PS waves would greatly distort the registration.To address the problem,we study the AVO of PP and PS waves and subsequently choose the inversed SS wave to match PS wave,for the reflectivity of SS wave has a consistent polarity with that of PS wave.Model tests demonstrate the effectiveness of this method.We use the dynamic time warping method,which has a good convergence,to match the inversed SS and PS data.By designing a model,we propose a novel method to flatten the layers automatically and get the layout of subsurface layers.With this flattening method,we get the misfit time and Vp/Vs ratio field using multidimensional dynamic time warping,which is consistent with the distribution of the underground layers.The real data test illustrates the advantage of matching PS wave by inversed SS wave instead of PP wave.Furthermore,the multidimensional dynamic time warping can well align the PS wave to the corresponding PP-time domain,with the Vp/Vs ratio inversed by the misfit time field.