Abstract：The paper discussed the concepts of equivalent low-velocity zone(LVZ),floating datum and fixed datum related to static corrections in data processing in complex subsurface conditions;expounded that the RG values in common-used two-step static corrections method represents the statics of relatively fixed datum in equivalent LVZ;the zero point of t0 value corresponds to top interface of equivalent LVZ after application of the high-frequency components of statics to seismic data;the influence of LVZ velocity and lateral change of thickness on time-to-depth inversion was described by theoretical records,the stack velocities also change when the lateral structures of LVZ have larger variation,so the influence of LVZ on stack velocities should be considered in time-to-depth inversion.
