Automatic Shear-wave Velocity Analysis with Elastic Reverse Time Migration
C.L. Wang, W. Weibull, J.B. Cheng and B. Arntsen
Event name: 79th EAGE Conference and Exhibition 2017
Session: Velocity Model Estimation - Theory A
Publication date: 12 June 2017
Info: Extended abstract, PDF ( 1.44Mb )
Price: € 20
Converted-wave has the potential to be a positive complement of the compressional imaging in some special cases. However, converted wave imaging is more difficult because the need of estimating the background velocity of S-wave. By applying differential semblance to measure the focusing error in the imaging domain, we automatically estimate the background S-wave velocity using reverse-time migration with a given estimated P-wave velocity. Compared to the P-wave, the S-wave velocity estimation via PS imaging gather does not need gradient from the source side. A simple synthetic result demonstrates the feasibility of the proposed method.