Abstract

Seismic data from the geologically complex fold belt area of Tripura is processed using first break based nonlinear refraction tomography for arriving at the near surface model (thereby statics).Horizon based rms velocities are picked directly from a set of constant velocity pre-stack time migrated sections. Migration is carried out from floating datum. Building up of interval velocity-depth model for PSDM begins with the inverted near surface model as the starting point and the model below this built layer by layer using sets of constant velocity pre-stack depth migrated outputs for picking of velocity. Results from this approach are presented and compared with the same obtained from conventional processing software. A high velocity hump in the inverted near surface model is investigated as a possible source of