Xie Chun-hui1,2, Sun Zan-dong1,4, Wang Xue-jun3, Yang Wu-yang2
1. Lab for Integration of Geology and Geophysics, China University of Petroleum(Beijing), Beijing, 102249, China;
2. Northwest Branch,Research Institute of Petroleum Exploration & Development,PetroChina, Lanzhou, Gansu,730020, China;
3. Geophysical Research Institute,BGP Inc., Zhuozhou, Hebei, 072751, China
Abstract：On the basis of geometric seismic principle,this paper employs travel-time of VSP down-going P wave,up-going P-P wave and up-going P-S wave to calculate interval velocity.Down-going P wave travel time may get the interval velocity above the receivers.Up-going P-P wave travel time may get the interval velocity below the receivers.Up-going P-S wave travel time may get the S-wave interval velocity.Finally we obtain the 3D velocity volume velocity for the zone of interest using the first arrival travel-time inversion.
